WO2018121061A1

WO2018121061A1 - Method and device for controlling phase-change refrigeration system with solid-state light-emitting light source, and projection device

Info

Publication number: WO2018121061A1
Application number: PCT/CN2017/109327
Authority: WO
Inventors: 谭大治; 胡飞; 李屹
Original assignee: 深圳市光峰光电技术有限公司
Priority date: 2016-12-30
Filing date: 2017-11-03
Publication date: 2018-07-05
Also published as: CN108266707A; CN108266707B

Abstract

A method and device for controlling a phase-change refrigeration system with a solid-state light-emitting light source, and a projection device, which relate to the technical field of control. The method comprises: acquiring a first empirical formula between the heat loss of a light source and a refrigeration system parameter (S1); when a solid-state light-emitting light source is operating, performing computation according to the first empirical formula to obtain the refrigeration system parameter (S2); quickly adjusting the refrigeration system via the refrigeration system parameter (S3); and finely adjusting the refrigeration system via a closed-loop control method (S4). By performing rapid adjustment on a refrigeration system via a relationship between the heat loss of a light source and a refrigeration system parameter and then performing fine adjustment on the refrigeration system, the problem of refrigerating capacity hysteresis of the refrigeration system, caused by an abrupt change in the heat loss of the light source, is solved, and the stability of temperature control of the light source is guaranteed.

Description

Solid-state light source phase change refrigeration system control method, device and projection device

Technical field

[0001] The present invention relates to the field of control technologies, and in particular, to a solid-state illumination source phase change refrigeration system control method

, devices and projection equipment.

Background technique

[0002] The lifetime and reliability of a laser source in a solid-state light source is directly related to the operating temperature of the laser. The higher the temperature, the faster the laser output power is attenuated and the less reliable. For high-power laser sources, how to keep the laser's operating temperature at a low level or even lower than the ambient temperature is one of the challenges in the design of high-power laser sources. The phase-change refrigeration system uses the heat absorption of the refrigerant phase change process. And the exotherm completes the refrigeration cycle, which cools the evaporator temperature at which the laser is mounted to below ambient temperature.

technical problem

[0003] Generally, a phase change refrigeration system in which a laser module is directly cooled by an evaporator is used to detect a temperature of a temperature measurement point set on an evaporator or a laser module, and a PID (Proportion-I) is applied according to a temperature change of the temperature measurement point. ntegral-Derivative, proportional integral derivative controller) The control method adjusts the system cooling capacity to keep the temperature of the temperature measurement point at the set value. This method is simple in control and wide in applicability. However, the thermal load of the concentrated heat source of the laser module, especially the temperature change response of the high-power concentrated heat load, is not sensitive enough. When the heat load of the heat source has a large change, the temperature control point The temperature fluctuates greatly before stabilization. This temperature fluctuation is caused by the aforementioned control method gradually adjusting the cooling capacity according to the temperature change of the temperature control point, and the heat load of the heat source is abrupt, and the cooling capacity and the heat load are before the temperature is stable. Mismatches result in large temperature fluctuations that adversely affect the reliability of the laser.

Problem solution

Technical solution

[0004] The main object of the present invention is to provide a solid-state light source phase change refrigeration system control method, device and projection device, through the relationship between the light source heat consumption and the parameters of the refrigeration system to quickly adjust the refrigeration system, and then to the refrigeration The system performs fine adjustment to solve the problem of the cooling capacity of the refrigeration system caused by the sudden change of the heat consumption of the light source, and ensures the stability of the temperature control of the light source. [0005] In order to achieve the above object, a control method for a solid-state light source phase change refrigeration system provided by the present invention includes:

[0006] obtaining a first empirical formula between the heat consumption of the light source and the parameters of the refrigeration system;

[0007] when the solid state light source is operated, the refrigeration system parameters are calculated according to the first empirical formula;

[0008] quickly adjusting the refrigeration system by the refrigeration system parameters;

[0009] The refrigeration system is finely adjusted by a closed loop control method.

[0010] Optionally, before the calculating the cooling system parameter according to the first empirical formula, the method further includes: determining whether the magnitude of the heat consumption change of the light source is greater than or equal to a preset threshold; if yes, according to the first The empirical formula calculates the parameters of the refrigeration system. If not, the refrigeration system is finely adjusted by a closed-loop control method.

[0012] Optionally, the heat consumption of the light source is calculated by a source current, and the parameter of the refrigeration system is a compressor speed

The first empirical formula between obtaining the heat consumption of the light source and the parameters of the refrigeration system is specifically: obtaining a second empirical formula between the current of the light source and the rotational speed of the compressor.

[0013] Optionally, the determining whether the heat consumption change direction of the light source is greater than or equal to a preset threshold; if yes, calculating the cooling system parameter according to the first empirical formula is:

[0014] pre-acquisition of the light source heat consumption data corresponding to the work of the solid-state light source;

[0015] calculating an average value of the light source currents in the preset inter-turn interval according to the heat consumption data of the light source;

[0016] determining whether the magnitude of the change in the average value of the light source current is greater than or equal to a preset current change amplitude threshold; [0017] If yes, calculating the compressor rotational speed according to the second empirical formula.

[0018] Optionally, after calculating the compressor speed according to the second empirical formula, the method further includes:

[0019] rapidly adjusting the refrigeration system by the compressor rotation speed at the initial engraving of the predetermined inter-turn period; [0020] fine-tuning the refrigeration system by a closed-loop control method.

[0021] Optionally, the closed loop control method includes: a PID control method, a fuzzy control, a predictive control, and a robust control.

[0022] As another aspect of the present invention, a solid state light source phase change refrigeration system control apparatus is provided, including:

[0023] a formula acquisition module, configured to obtain a first empirical formula between a heat consumption of the light source and a parameter of the refrigeration system; [0024] a calculation module, configured to calculate the refrigeration according to the first empirical formula when the solid state light source is operated System parameters;

[0025] a quick adjustment module, configured to quickly adjust the refrigeration system by using the refrigeration system parameters;

[0026] A fine adjustment module is configured to finely adjust the refrigeration system by a closed loop control method after a quick adjustment of the refrigeration system or when the magnitude of the heat loss of the light source is less than a preset threshold.

[0027] Optionally, the method further includes:

[0028] The determining module is configured to determine whether the magnitude of the heat loss change of the light source is greater than or equal to a preset threshold; if yes, the calculating module calculates the cooling system parameter according to the first empirical formula.

[0029] Optionally, the heat consumption of the light source is calculated by a light source current, the refrigeration system parameter is a compressor speed, and the formula obtaining module comprises: a second formula acquiring unit, configured to obtain a light source current and a compressor speed The second empirical formula between.

[0030] Optionally, the determining module includes:

[0031] a light source heat loss obtaining unit, configured to pre-acquire the light source heat consumption data corresponding to the work of the solid-state light source; [0032] a current average obtaining unit, configured to calculate the preset interval according to the heat consumption data of the light source Average value of the source current;

[0033] a current determining unit, configured to determine whether a variation amplitude of the average value of the light source current is greater than or equal to a preset current change amplitude threshold;

[0034] Correspondingly, the calculation module is further configured to:

[0035] Calculating the compressor speed according to the second empirical formula.

[0036] Optionally, the fast adjustment module is specifically:

[0037] the cooling system is rapidly adjusted by the compressor rotation speed at the initial engraving of the preset inter-segment; [0038] the fine adjustment module is specifically:

[0039] The refrigeration system is finely adjusted by a PID control method.

[0040] As still another aspect of the present invention, there is provided a projection apparatus comprising the above-described solid-state light source phase change refrigeration system control apparatus.

Advantageous effects of the invention

Beneficial effect

[0041] The present invention provides a solid-state light source phase change refrigeration system control method, apparatus and projection apparatus, the method comprising: obtaining a first empirical formula between the heat consumption of the light source and the parameters of the refrigeration system; Source working, calculating a refrigeration system parameter according to the first empirical formula; rapidly adjusting the refrigeration system by the refrigeration system parameter; finely adjusting the refrigeration system by a closed loop control method, and the invention uses the heat consumption of the light source The relationship between the parameters of the refrigeration system is quickly adjusted to the refrigeration system, and then the refrigeration system is finely adjusted to solve the problem of the cooling capacity of the refrigeration system caused by the sudden change of the heat consumption of the light source, and the stability of the temperature control of the light source is ensured.

Brief description of the drawing

DRAWINGS

1 is a flow chart of a method for controlling a phase change refrigeration system of a solid state light source according to a first embodiment of the present invention.

2 is a flow chart of a method for controlling a phase change refrigeration system of a solid state light source according to a second embodiment of the present invention.

3 is a schematic diagram of a function of a solid-state light-emitting source phase change refrigeration system according to a second embodiment of the present invention; [0045] FIG. 4 is a second solid-state light source phase change refrigeration system control method according to Embodiment 2 of the present invention; Flow chart

5 is a diagram showing an example of a solid-state illuminating light source current change with a turn-to-turn relationship according to a second embodiment of the present invention; FIG. 6 is a schematic diagram of a solid-state illuminating light source phase change refrigeration system according to a third embodiment of the present invention; An exemplary structural block diagram of the device;

7 is a block diagram showing an exemplary structure of a control device for a phase change refrigeration system of a solid state light source according to Embodiment 4 of the present invention;

8 is a block diagram showing an exemplary structure of a control device for a phase change refrigeration system of a solid state light source according to a fourth embodiment of the present invention.

[0050]

[0051] The implementation, functional features, and advantages of the present invention will be further described with reference to the accompanying drawings.

Embodiments of the invention

The specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0053] In the following description, the use of a suffix such as "module" or "unit" for representing an element is only advantageous. The description of the present invention does not have a specific meaning per se. Therefore, "module" and "unit" can be used in combination.

[0054]

[0055] Embodiment 1

[0056] As shown in FIG. 1, in this embodiment, a solid-state light source phase change refrigeration system control method includes

[0057] Sl, obtaining a first empirical formula between the heat consumption of the light source and the parameters of the refrigeration system;

[0058] S2, when the solid-state light source is operated, calculating a refrigeration system parameter according to the first empirical formula;

[0059] S3, performing rapid adjustment of the refrigeration system by using the parameters of the refrigeration system;

[0060] S4, finely adjusting the refrigeration system by a closed loop control method.

[0061] In the embodiment, the refrigeration system is rapidly adjusted by the relationship between the heat consumption of the light source and the parameters of the refrigeration system, and then the refrigeration system is finely adjusted to solve the refrigeration system refrigeration caused by the sudden change of the heat consumption of the light source. The problem of lag ensures the stability of the temperature control of the light source.

In the embodiment, the solid-state light-emitting source includes a laser and a light-emitting diode, and the control method of the phase-change refrigeration system of the solid-state light source is described in detail below by taking a laser light source as an example.

[0063] As shown in FIG. 3, in the present embodiment, a laser refrigeration system using phase change refrigeration includes: a laser light source 1, a compressor 2, a condenser 3, a throttling device 4, and a laser light source 1, and compression The connecting line 5 between the machine 2, the condenser 3, and the throttle device 4 is connected to each other. The laser source comprises at least one laser assembly 11, 12, each laser assembly comprising a laser module 112 and a water cooled plate 111. The laser module is fixedly mounted on the cold plate, and the mounting interface should be filled with a material with high thermal conductivity (such as thermal grease, graphite sheet, etc.) to reduce the contact thermal resistance. The refrigerant flows through the cold plate flow path and undergoes a phase change endotherm, taking away the heat generated by the laser.

[0064] The refrigerant shown in FIG. 3 flows through the laser light source 1 and is heated and vaporized. After passing through the compressor 2, it becomes a high-pressure superheated steam, which is liquefied by the condenser 3 to become a high-pressure liquid, and then throttled by the throttling device 4, and the pressure is increased. Reduce to low temperature and low pressure wet steam and re-enter light source 1. The cold plate included in the light source system is used as the evaporator of the phase change cooling system, and the refrigerant flows through the cold plate only to undergo phase change endotherm, and the temperature is substantially constant, so that the temperature of each cold plate in the light source can be kept substantially the same. The cold plate or laser module in FIG. 3 is arranged with a temperature measuring point 113. The refrigeration system adjusts the cooling capacity of the system according to the temperature fed back by the temperature measuring point 113 through a PID control method or other closed-loop control method to keep the temperature of the temperature measuring point stable. [0065] However, when the thermal load of the laser module changes, especially if the change is large, for example, the thermal load jumps from 300W to 600W, the PID controller gradually adjusts the cooling capacity according to the temperature of the read temperature control point, resulting in the cooling capacity. The change lags behind the change of the heat load, the temperature of the temperature control point is stable and long, and there is a large fluctuation before the stabilization, which has an adverse effect on the reliability of the laser.

[0066] In the embodiment, when the brightness of the light source changes, the light source control program adjusts the current of the laser light source, which is one of the heat consumption parameters of the light source, according to the required brightness, as the control device that performs the above control method according to the adjusted laser light. The first empirical formula between the source current and the parameters of the refrigeration system, the refrigeration system is quickly adjusted by the parameters of the refrigeration system, and the refrigeration system is finely adjusted by the closed-loop control method, thereby overcoming the change of the thermal load of the laser module. In particular, the temperature control point brought by the large change is stable and long-lasting, and has a large fluctuation before the temperature is stabilized, which ensures the reliability of the laser.

[0067] Embodiment 2

[0068] As shown in FIG. 2, in this embodiment, a solid state light source phase change refrigeration system control method includes

[0069] S10. Obtain a first empirical formula between heat consumption of the light source and parameters of the refrigeration system;

[0070] S20, when the solid-state light source is working, determine whether the heat source change amplitude is greater than or equal to a preset threshold; if yes, proceed to step S30, and if not, proceed to step S50;

[0071] S30, calculating a refrigeration system parameter according to the first empirical formula;

[0072] S40. Perform fast adjustment of the refrigeration system by using the parameters of the refrigeration system;

[0073] S50. Perform fine adjustment on the refrigeration system by a closed loop control method.

[0074] In the embodiment, the refrigeration system is rapidly adjusted by the relationship between the heat consumption of the light source and the parameters of the refrigeration system, and then the refrigeration system is finely adjusted to solve the refrigeration system refrigeration caused by the sudden change of the heat consumption of the light source. The problem of lag ensures the stability of the temperature control of the light source.

In the embodiment, the solid-state light-emitting source includes a laser and a light-emitting diode. The laser light source is taken as an example to describe the control method of the solid-state light source phase change refrigeration system.

[0076] As shown in FIG. 3, in the present embodiment, a laser refrigeration system using phase change refrigeration includes: a laser light source 1, a compressor 2, a condenser 3, a throttling device 4, and a laser light source 1, and compression The connecting line 5 between the machine 2, the condenser 3, and the throttle device 4 is connected to each other. The laser source comprises at least one laser component 11, 12, each The laser assembly includes a laser module 112 and a water cooled plate 111. The laser module is fixedly mounted on the cold plate, and the mounting interface should be filled with a material with high thermal conductivity (such as thermal grease, graphite sheet, etc.) to reduce the contact thermal resistance. The refrigerant flows through the cold plate flow path to undergo phase change endotherm, taking away the heat generated by the laser.

[0077] The refrigerant shown in FIG. 3 flows through the laser light source 1 and is heated and vaporized. After passing through the compressor 2, it becomes a high-pressure superheated steam, which is liquefied by the condenser 3 to become a high-pressure liquid, and then throttled by the throttling device 4, and the pressure is increased. Reduce to low temperature and low pressure wet steam and re-enter light source 1. The cold plate included in the light source system is used as the evaporator of the phase change cooling system. The refrigerant flows through the cold plate only to undergo phase change endotherm, and the temperature is basically unchanged, so that the temperature of each cold plate in the light source can be kept substantially the same. The cold plate or laser module in Fig. 3 is provided with a temperature measuring point 113. The cooling system adjusts the cooling capacity of the system according to the temperature fed back by the temperature measuring point 113 through a PID control method or other closed loop control method to keep the temperature of the temperature measuring point stable.

[0078] However, when the thermal load of the laser module changes, especially if the change is large, for example, the thermal load jumps from 300W to 600W, the PID controller gradually adjusts the cooling capacity according to the temperature of the read temperature control point, resulting in the cooling capacity. The change lags behind the change of the heat load, the temperature of the temperature control point is stable and long, and there is a large fluctuation before the stabilization, which has an adverse effect on the reliability of the laser.

[0079] In this embodiment, the heat consumption of the light source is calculated by a laser current, the parameter of the refrigeration system is a compressor speed, and the first empirical formula between the heat consumption of the light source and the parameters of the refrigeration system is specifically: A second empirical formula between the laser current and the compressor speed is obtained, and the variation of the heat consumption of the light source can be calculated by the heat consumption of the light source.

[0080] As another embodiment, the heat consumption of the light source may also be related to voltage and junction temperature, and the refrigeration system parameters may also be related to the speed of the condenser fan. These parameters may also represent the heat consumption of the light source and the parameters of the refrigeration system. Participate in the calculation.

[0081] In the present embodiment, the laser refrigeration system in FIG. 3 adds a temperature measurement point 6 of an ambient temperature, and sets the ambient temperature Ta, the heat consumption of the laser module! ⁵ . Considering the simplest case, the fan speed of the refrigeration system condenser and the throttle device parameters remain unchanged, and the system cooling capacity is regulated by the speed RS of the compressor. Through the prototype test, the relationship between the required speed RS of the compressor and the ambient temperature Ta and the heat consumption P of the laser module can be obtained in order to control the temperature of the laser module to TO:

RS=f(Ta, P) first empirical formula

[0083] In the case where the cold plate temperature is kept stable, the heat consumption P of the laser module is related to the current I of the laser, when the light The source control program adjusts the laser current 吋 to calculate the heat dissipation P of the laser module at this current, so Equation 1 can also be expressed as:

RS=f(Ta, I) Second empirical formula

[0085] In the embodiment, during the operation of the laser light source, the refrigeration system control program calls the PID program to adjust the temperature of the temperature control point. However, when the light source control program adjusts the laser current I吋 according to the desired brightness, the current value is fed back to the refrigeration system control program. When the refrigeration system control program receives the current value change, it will pause the PID program, directly calculate and set the required compressor speed according to the second empirical formula, and then restart the PID program to finely adjust the temperature of the temperature control point.

[0086] In the embodiment, when the brightness of the light source is frequently adjusted, the heat consumption of the laser module is small, and the PID control program can quickly adapt to a small change of the heat load and maintain the temperature of the temperature control point. The compressor speed is reset every time the current I changes. That is, when the heat consumption of the light source changes by less than the preset threshold, the process proceeds to step S50, and the refrigeration system is finely adjusted by the closed loop control method.

[0087] In this embodiment, the preset threshold is a user-defined change amplitude value, for example, the preset threshold is 10%, and when the heat consumption of the light source changes by 10% or more, the step is entered. S30, if no, proceed to step S50.

[0088] In this embodiment, the laser light source is generally used for the projector to work, the output brightness of the light source needs to be adjusted with the projection screen, and the adjustment range is large, and after the projection image is known in advance, the image of the projector can be used. The processing program analyzes the projection content in advance, divides the working time of the laser light source into a predetermined number of inter-turn segments, determines the projection brightness required for different engravings, obtains the heat consumption data of the light source, and feeds back to the light source control program. The light source control program calculates the average value of the laser current in each preset interval according to the heat consumption data of the light source. Therefore, as shown in FIG. 4, taking a certain preset interval as an example, the laser light source changes. The refrigeration system control method is specifically:

[0089] Sl l, obtaining a second empirical formula between the laser current and the compressor speed;

[0090] S21, pre-acquisition of the light source heat consumption data corresponding to the working of the laser light source;

[0091] S22. Calculate an average value of the laser current in the preset inter-turn interval according to the heat consumption data of the light source;

[0092] S23. Determine whether a variation amplitude of the average value of the laser current is greater than or equal to a preset threshold value of the current variation amplitude; [0093] If yes, proceed to step S31, if no, proceed to step S51;

[0094] S31. Calculate a compressor rotation speed according to the second empirical formula.

[0095] In this embodiment, after the step S31, the method further includes:

[0096] S41, performing rapid adjustment of the refrigeration system by the compressor rotation speed at the initial engraving of the preset inter-turn interval;

[0097] S51. Perform fine adjustment on the refrigeration system by a closed loop control method.

[0098] In the embodiment, the closed loop control method includes: a PID control method, a fuzzy control, a predictive control, and a robust control.

[0099] As shown in FIG. 5, an example of a change in the current of the laser light source during the execution of the projection screen, as shown in FIG.

, _tl -t ₄ four preset inter-segments can be irregularly divided according to the current size, try to make the division point of the inter-turn segment in the current jump engraving, in order to facilitate the stable operation of the refrigeration system.

[0100] In this embodiment, for the length and division of the preset inter-segment, the image processing program analyzes the projection content in advance, and can determine that the current variation in a certain period is small, and mark the inter-turn as one In the inter-turn section, the compressor speed in this inter-turn section is set by the average current value, and the length of each inter-turn section is not required to be consistent.

For example, the preset inter-segment can satisfy the following conditions: The length of the inter-segment is >=3 minutes (the frequent adjustment of the inter-segment is too short has no meaning); the inter-segment is divided: the target is to make adjacent The mean current of the interval is the largest, for example, t ^ four inter-segments are divided. The average currents of the four inter-turns are represented as II, 12, 13, and 14, respectively. The final result is (ΙΙ2-Ι1Ι). +ΙΙ3-Ι2Ι+ΙΙ4-Ι3Ι)/(η-1) is the largest, n is the number of inter-segments, where n=4.

[0101]

Embodiment 3

[0103] As shown in FIG. 6, in this embodiment, a solid state light source phase change refrigeration system control device includes

[0104] The formula acquisition module 1 is configured to obtain a first empirical formula between the heat consumption of the light source and the parameters of the refrigeration system; [0105] the calculation module 2 is configured to: when the solid-state illumination source operates, calculate according to the first empirical formula Obtaining refrigeration system parameters;

[0106] a quick adjustment module 3, configured to quickly adjust a refrigeration system by using the refrigeration system parameters;

[0107] Fine adjustment module 4, for after the rapid adjustment of the refrigeration system or when the heat consumption of the light source changes Less than a preset threshold 吋, the refrigeration system is finely adjusted by a closed loop control method.

[0108] In this embodiment, the refrigeration system is rapidly adjusted by the relationship between the heat consumption of the light source and the parameters of the refrigeration system, and then the refrigeration system is finely adjusted to solve the lag of the refrigeration system caused by the sudden change in the heat consumption of the light source. The problem is to ensure the stability of the temperature control of the light source.

[0109] In the embodiment, the solid-state light-emitting source includes a laser and a diode, and the method for controlling the phase-change refrigeration system of the solid-state light source is described in detail below by taking a laser source as an example.

[0110] As shown in FIG. 3, in the present embodiment, a laser refrigeration system using phase change refrigeration includes: a laser light source 1, a compressor 2, a condenser 3, a throttling device 4, and a laser light source 1, and compression The connecting line 5 between the machine 2, the condenser 3, and the throttle device 4 is connected to each other. The laser source comprises at least one laser assembly 11, 12, each laser assembly being comprised of a laser module 112 and a water cooled plate 111. The laser module is fixedly mounted on a cold plate, and the mounting interface should be filled with a material with high thermal conductivity (such as thermal grease, graphite sheet, etc.) to reduce contact thermal resistance. The refrigerant flows through the cold plate flow path to undergo phase change endotherm, taking away the heat generated by the laser.

[0111] The refrigerant shown in FIG. 3 flows through the laser light source 1 and is heated and vaporized. After passing through the compressor 2, it becomes a high-pressure superheated steam, which is liquefied by the condenser 3 to become a high-pressure liquid, and then throttled by the throttling device 4, and the pressure is increased. Reduce to low temperature and low pressure wet steam and re-enter light source 1. The cold plate included in the light source system is used as the evaporator of the phase change cooling system. The refrigerant flows through the cold plate only to undergo phase change endotherm, and the temperature is basically unchanged, so that the temperature of each cold plate in the light source can be kept substantially the same. The cold plate or laser module in Fig. 3 is provided with a temperature measuring point 113, and the refrigeration system adjusts the cooling capacity of the system according to the temperature feedback of 113 by the PID control method or other closed loop control method to keep the temperature of the temperature measuring point stable.

[0112] However, when the thermal load of the laser module changes, especially if the change is large, for example, the thermal load jumps from 300W to 600W, the PID controller gradually adjusts the cooling capacity according to the temperature of the read temperature control point, resulting in the cooling capacity. The change lags behind the change of the heat load, the temperature of the temperature control point is stable and long, and there is a large fluctuation before the stabilization, which has an adverse effect on the reliability of the laser.

[0113] In the embodiment, when the brightness of the light source changes, the light source control program adjusts the current of the laser light source as one of the heat consumption parameters of the light source according to the required brightness, and the formula of the control device of the phase change refrigeration system of the solid state light source is obtained. The module obtains the first empirical formula between the current of the laser light source and the parameters of the refrigeration system, and firstly uses the rapid adjustment module to quickly adjust the refrigeration system through the parameters of the refrigeration system, and then finely adjusts the refrigeration system through the closed-loop control method by using the fine adjustment module. Adjust, so that you can overcome The thermal load of the optical module changes, especially when the temperature is constant, and the temperature of the temperature control point is long, and the fluctuation of the temperature before the temperature is stable, which ensures the reliability of the laser.

[0114]

Embodiment 4

[0116] As shown in FIG. 7, in this embodiment, a solid-state light source phase change refrigeration system control device includes

[0117] The formula obtaining module 10 is configured to obtain a first empirical formula between the heat consumption of the light source and the parameters of the refrigeration system; [0118] the determining module 20 is configured to determine whether the heat consumption of the light source is greater than the magnitude of the heat consumption of the solid state light source Equal to a preset threshold;

[0119] The calculating module 30 is configured to calculate a cooling system parameter according to the first empirical formula when a heat consumption of the light source is greater than or equal to a preset threshold value;

[0120] a quick adjustment module 40, configured to quickly adjust the refrigeration system by using the refrigeration system parameters;

[0121] The fine adjustment module 50 is configured to finely adjust the refrigeration system by a closed loop control method after the quick adjustment of the refrigeration system or when the magnitude of the heat loss of the light source is less than a preset threshold.

[0122] In this embodiment, the refrigeration system is quickly adjusted by the relationship between the heat consumption of the light source and the parameters of the refrigeration system, and then the refrigeration system is finely adjusted to solve the lag of the refrigeration system caused by the sudden change in heat consumption of the light source. The problem is to ensure the stability of the temperature control of the light source.

[0123] In the embodiment, the solid-state light-emitting source includes a laser and a diode, and the method for controlling the phase-change refrigeration system of the solid-state light source is described in detail below by taking a laser source as an example.

[0124] As shown in FIG. 3, in the present embodiment, a laser refrigeration system using phase change refrigeration includes: a laser light source 1, a compressor 2, a condenser 3, a throttling device 4, and a laser light source 1, and compression The connecting line 5 between the machine 2, the condenser 3, and the throttle device 4 is connected to each other. The laser source comprises at least one laser assembly 11, 12, each laser assembly being comprised of a laser module 112 and a water cooled plate 111. The laser module is fixedly mounted on a cold plate, and the mounting interface should be filled with a material with high thermal conductivity (such as thermal grease, graphite sheet, etc.) to reduce contact thermal resistance. The refrigerant flows through the cold plate flow path to undergo phase change endotherm, taking away the heat generated by the laser.

[0125] The refrigerant shown in FIG. 3 flows through the laser light source 1 and is heated and vaporized. After passing through the compressor 2, it becomes a high-pressure superheated steam, which is liquefied by the condenser 3 to become a high-pressure liquid, and then throttled by the throttling device 4, and the pressure is increased. Reduce to low temperature and low pressure wet steam and re-enter light source 1. The cold plate included in the light source system is used as a phase change cooling system In the evaporator, the refrigerant flows through the cold plate only to undergo phase change endotherm, and the temperature is substantially constant, so that the temperature of each cold plate in the light source can be kept substantially the same. The cold plate or laser module in FIG. 3 is arranged with a temperature measuring point 113. The refrigeration system adjusts the cooling capacity of the system according to the temperature feedback of 113 by the PID control method or other closed-loop control method to keep the temperature of the temperature measuring point stable.

[0126] However, when the thermal load of the laser module changes, especially if the change is large, for example, the thermal load jumps from 300W to 600W, the PID controller gradually adjusts the cooling capacity according to the temperature of the read temperature control point, resulting in the cooling capacity. The change lags behind the change of the heat load, the temperature of the temperature control point is stable and long, and there is a large fluctuation before the stabilization, which has an adverse effect on the reliability of the laser.

[0127] In this embodiment, the heat consumption of the light source is calculated by a laser current, the parameter of the refrigeration system is a compressor speed, and the first empirical formula between the heat consumption of the light source and the parameters of the refrigeration system is specifically: A second empirical formula between the laser current and the compressor speed is obtained.

[0128] As another embodiment, the heat consumption of the light source may also be related to voltage and junction temperature, and the refrigeration system parameters may also be related to the speed of the condenser fan. These parameters may also represent the heat consumption of the light source and the parameters of the refrigeration system. Participate in the calculation.

[0129] In the present embodiment, the laser refrigeration system in FIG. 3 adds a temperature measurement point 6 of an ambient temperature, and sets the ambient temperature Ta, the heat consumption of the laser module! ⁵ . Considering the simplest case, the fan speed of the refrigeration system condenser and the throttle device parameters remain unchanged, and the system cooling capacity is regulated by the speed RS of the compressor. Through the prototype test, the relationship between the required speed RS of the compressor and the ambient temperature Ta and the heat consumption P of the laser module can be obtained in order to control the temperature of the laser module to TO:

[0130] RS=f(Ta, P) first empirical formula

[0131] In the case where the temperature of the cold plate is kept stable, the heat consumption P of the laser module is related to the current I of the laser. When the light source control program adjusts the laser current 吋, the heat consumption P of the laser module at this current can be calculated. Thus Equation 1 can also be expressed as:

[0132] RS=f(Ta, I) Second empirical formula

[0133] In the embodiment, during the operation of the laser light source, the refrigeration system control program calls the PID program to adjust the temperature of the temperature control point. However, when the light source control program adjusts the laser current I吋 according to the desired brightness, the current value is fed back to the refrigeration system control program. When the refrigeration system control program receives the current value change, it will pause the PID program, directly calculate and set the required compressor speed according to the second empirical formula, and then Restart the PID program to fine-tune the temperature of the temperature control point.

[0134] In this embodiment, when the brightness of the light source is frequently adjusted, the heat consumption of the laser module is less changed.

The PID control program can quickly adapt to small changes in the thermal load and keep the temperature at the temperature control point stable. There is no need for the current I to reset the compressor speed every time. That is, when the heat consumption of the light source is less than a preset threshold, the process proceeds to step S50, and the refrigeration system is finely adjusted by a closed loop control method.

[0135] In this embodiment, the laser light source is generally used for the operation of the projector, and the output brightness of the light source needs to be adjusted with the projection screen, and the adjustment range is large. After the projection image is known in advance, the image of the projector can be used. The processing program analyzes the projection content in advance, divides the working time of the laser light source into a predetermined number of inter-turn segments, determines the projection brightness required for different engravings, obtains the heat consumption data of the light source, and feeds back to the light source control program. The light source control program calculates the average value of the laser current in each preset interval based on the heat loss data of the light source.

[0136] As shown in FIG. 8, in this embodiment, taking a certain preset interval as an example, the determining module 20 includes

[0137] The light source heat loss obtaining unit 21 is configured to pre-acquire the light source heat consumption data corresponding to the work of the solid state light source

[0138] The current average value obtaining unit 22 is configured to calculate an average value of the laser current in the preset inter-turn interval according to the heat consumption data of the light source;

[0139] The current determining unit 23 is configured to determine whether a variation amplitude of the average value of the laser current is greater than or equal to a preset current variation amplitude threshold;

[0140] Correspondingly, the calculation module is further configured to:

[0141] The compressor speed is calculated according to the second empirical formula.

[0142] In this embodiment, the fast adjustment module is specifically:

And [0143] rapidly adjusting the refrigeration system by the compressor rotation speed at the initial engraving of the preset inter-turn period; [0144] the fine adjustment module is specifically:

[0145] The refrigeration system is finely adjusted by a PID control method.

[0146] In the embodiment, the closed loop control method includes: a PID control method, a fuzzy control, a predictive control, and a robust control.

[0147] As shown in FIG. 5, which is an exemplary diagram of a current of a laser light source undergoing a certain projection picture as a function of time. In the figure, - the four preset inter-segments can be irregularly divided according to the current magnitude, so as to make the division point of the inter-turn segment in the current jump engraving, so as to facilitate the stable operation of the refrigeration system.

[0148] In this embodiment, for the length and division of the preset inter-segment, the image processing program analyzes the projection content in advance, and can determine that the current variation in a certain period is small, and the period is marked as one In the inter-segment section, the compressor speed in the inter-segment section is set by the average current value, and the length of each inter-turn section is not required to be uniform. For example, the preset inter-turn section can satisfy the following conditions: Length >= 3 minutes (frequent adjustment of the inter-segment section is not meaningful); Dividing the inter-segment: The goal is to maximize the average current variation between adjacent inter-segments, for example, a total of t ^ four inter-segments The average currents of the four inter-segments are expressed as II, 12, 13, and 14, respectively. The final result is (ΙΙ2-Ι1Ι+ΙΙ3-Ι2Ι+ΙΙ4-Ι3Ι)/(η-1), and n is the daytime. The number of segments, where n=4.

[0149]

[0150] Embodiment 5

[0151] In this embodiment, a projection device includes a solid-state light source phase change refrigeration system control device according to the third embodiment or the fourth embodiment, in addition to the conventional function module of the projection device, The relationship between the consumption and the parameters of the refrigeration system is quickly adjusted, and then the refrigeration system is finely adjusted to solve the problem of the cooling capacity of the refrigeration system caused by the sudden change of the heat consumption of the light source, and the stability of the temperature control of the light source is ensured. , improving the user experience of the projection device.

[0152]

[0153] It is to be noted that the terms "comprising", "including", or any other variants thereof are intended to encompass a non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes Those elements, but also other elements not explicitly listed, or elements that are inherent to such a process, method, item or device. An element defined by the phrase "comprises a ..." without further restrictions does not exclude the presence of additional elements in the process, method, article, or device that comprises the element.

[0154] The foregoing serial numbers of the embodiments of the present invention are merely for the description, and do not represent the advantages and disadvantages of the embodiments.

[0155]

The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the description of the present invention and the drawings are used directly or indirectly. Other related technical fields are equally included in the scope of patent protection of the present invention.

Claims

Claim

[Claim 1] A method for controlling a phase change refrigeration system of a solid state light source, comprising: obtaining a first empirical formula between a heat consumption of a light source and a parameter of a refrigeration system;

When the solid state light source is operated, the parameters of the refrigeration system are calculated according to the first empirical formula;

The refrigeration system is rapidly adjusted by the refrigeration system parameters; the refrigeration system is finely adjusted by a closed loop control method.

[Claim 2] 2. The solid-state light source phase change refrigeration system control method according to claim 1, wherein the calculating the refrigeration system parameters according to the first empirical formula further comprises:

Determining whether the magnitude of the change in the heat consumption of the light source is greater than or equal to a preset threshold; if so, calculating the parameters of the refrigeration system according to the first empirical formula, and if not, fine-tuning the refrigeration system by the closed-loop control method.

[Claim 3] The method for controlling a phase change refrigeration system of a solid-state light source according to claim 2, wherein the heat consumption of the light source is calculated by a source current, and the parameter of the refrigeration system is a compressor speed. The first empirical formula between obtaining the heat consumption of the light source and the parameters of the refrigeration system is specifically: obtaining a second empirical formula between the source current and the compressor speed.

[Claim 4] The method for controlling a phase change refrigeration system of a solid-state light source according to claim 3, wherein the determining whether the heat loss variation of the light source is greater than or equal to a preset threshold; if so, according to the The first empirical formula calculates the parameters of the refrigeration system as follows: pre-acquisition of the heat consumption data of the light source corresponding to the operation of the solid-state light source;

Calculating, according to the heat consumption data of the light source, an average value of the light source currents in the preset inter-turn period; determining whether a change amplitude of the average value of the current source current is greater than or equal to a preset current change amplitude threshold;

If so, the compressor speed is calculated based on the second empirical formula.

[Claim 5] The method of controlling a solid-state light source phase change refrigeration system according to claim 4, wherein the calculating the compressor speed according to the second empirical formula further comprises Quickly adjusting the refrigeration system by the compressor rotation speed at the beginning of the predetermined inter-turn interval;

The refrigeration system is finely adjusted by a closed loop control method.

6. The solid state light source phase change refrigeration system control method according to claim 1, wherein the closed loop control method comprises: a PID control method, a fuzzy control, a predictive control, and a robust control.

A solid-state illuminating light source phase change refrigeration system control device, comprising: a formula acquisition module, configured to obtain a first empirical formula between a heat consumption of a light source and a parameter of a refrigeration system;

a calculation module, configured to calculate a refrigeration system parameter according to the first empirical formula when the solid state light source is operated;

a quick adjustment module, configured to quickly adjust a fine adjustment module of the refrigeration system through the refrigeration system parameter, after the rapid adjustment of the refrigeration system or when the heat consumption of the light source is less than a preset threshold, by a closed loop control method Fine adjustment of the refrigeration system.

8. The solid state light source phase change refrigeration system control apparatus according to claim 7, wherein the method further comprises:

The determining module is configured to determine whether the magnitude of the heat consumption change of the light source is greater than or equal to a preset threshold; if yes, the calculating module calculates the cooling system parameter according to the first empirical formula.

9. The solid-state light source phase change refrigeration system control apparatus according to claim 8, wherein the heat consumption of the light source is calculated by a light source current, the refrigeration system parameter is a compressor speed, and the formula acquisition module comprises : a second formula acquisition unit for obtaining a second empirical formula between the source current and the compressor speed.

The control device of the solid state light source phase change refrigeration system according to claim 9, wherein the determining module comprises:

a light source heat consumption obtaining unit, configured to pre-acquire heat energy consumption data of the light source corresponding to the work of the solid state light source; a current average value obtaining unit, configured to calculate an average value of the light source currents in the preset inter-turn interval according to the heat consumption data of the light source;

a current judging unit, configured to determine whether a change amplitude of the average value of the current source current is greater than a preset current change amplitude threshold;

Correspondingly, the calculation module is further configured to calculate the compressor rotation speed according to the second empirical formula.

[Claim 11] The solid-state light source phase change refrigeration system control device according to claim 10, wherein the quick adjustment module is specifically:

Quickly adjusting the refrigeration system by the compressor speed at the beginning of the predetermined interval;

The fine adjustment module is specifically:

The refrigeration system is finely adjusted by a PID control method.

[Claim 12] 12. A projection apparatus comprising the solid state light source phase change refrigeration system control apparatus according to any one of claims 7-11.