Power control method, circuit and lighting system for driving power supply of vehicle compartment lighting system

Abstract

The present invention discloses a power control method, circuit and lighting system for a driving power supply of a vehicle compartment lighting system, and the method includes the steps of: obtaining the temperature values ​​of key components of two groups of driving power supplies; confirming whether the temperature values ​​of the two groups of driving power supplies are within a qualified range, and if the temperature values ​​of the two groups of driving power supplies are within a qualified range, confirming whether the temperature difference of the temperature values ​​of the two groups of driving power supplies is within a preset temperature difference range; if the temperature difference is not within the preset temperature difference range, obtaining the output voltage values ​​of the two groups of driving power supplies; if the output voltage values ​​of the two groups of driving power supplies are less than or equal to the preset voltage threshold, adjusting the output voltage of the driving power supply with a relatively high temperature value, or first adjusting the output voltage of the driving power supply with a higher temperature value and then adjusting the output voltage of the driving power supply with a relatively low temperature, so that the temperature difference is within the preset temperature difference range. The present invention improves the safety and reliability of the vehicle compartment lighting system by dynamically allocating the driving power of the two groups of driving power supplies in real time.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle compartment lighting, and in particular to a power control method, a circuit and a lighting system for a driving power supply of a vehicle compartment lighting system. Background Art

[0002] At present, train carriage lighting generally adopts centralized power supply and redundant design scheme, that is, under normal circumstances, the carriage lighting system is powered by two sets of identical driving power supplies, and the output power of the two sets of driving power supplies is consistent. When one of the driving power supplies fails, the other driving power supply can ensure that normal lighting is not affected.

[0003] The reliability of the train compartment lighting driver power supply is particularly important because it involves the safety of personnel and driving. Due to the differences in the installation locations, ventilation conditions and other external factors of the two driver power supplies, there may be a large difference in the temperature rise of the two driver power supplies, which affects the service life of the product. Therefore, the two driver power supplies use an equal power distribution method, which results in inconsistencies in the service life of the two driver power supplies, reducing the reliability of the compartment lighting system.

[0004] Therefore, the prior art still needs to be improved and developed. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a power control method, circuit and lighting system for a car lighting system driving power supply, so as to solve the problem that the redundant driving power supply of the existing train car lighting system adopts a power sharing method to reduce the reliability of the car lighting system.

[0006] The technical solution of the present invention is as follows:

[0007] In a first aspect, the present invention provides a power control method for a driving power supply of a vehicle compartment lighting system, wherein the lighting driving system includes two sets of driving power supplies, and the method includes the steps of:

[0008] Obtain the temperature values ​​of key components of two sets of driving power supplies;

[0009] Confirm whether the temperature values ​​of the two sets of driving power supplies are within the qualified range. If the temperature values ​​of the two sets of driving power supplies are within the qualified range, then confirm whether the temperature difference between the temperature values ​​of the two sets of driving power supplies is within the preset temperature difference range;

[0010] If the temperature difference is not within the preset temperature difference range, then obtaining output voltage values ​​of two sets of driving power supplies;

[0011] If the output voltage values ​​of the two groups of driving power supplies are less than or equal to the preset voltage threshold, the output voltage of the driving power supply with a relatively higher temperature value is adjusted so that the temperature difference is within the preset temperature difference range, or the output voltage of the driving power supply with a higher temperature value is adjusted first and then the output voltage of the driving power supply with a relatively lower temperature value is adjusted so that the temperature difference is within the preset temperature difference range.

[0012] According to a further configuration of the present invention, if the output voltage values ​​of the two groups of driving power supplies are less than or equal to the preset voltage threshold, the output voltage of the driving power supply with a relatively higher temperature value is adjusted so that the temperature difference is within the preset temperature difference range, or the output voltage of the driving power supply with a relatively higher temperature value is first adjusted and then the output voltage of the driving power supply with a relatively lower temperature value is adjusted so that the temperature difference is within the preset temperature difference range. Specifically, the steps include:

[0013] When it is detected that the output voltage values ​​of the two groups of driving power supplies exceed the preset voltage threshold, a fault alarm is issued;

[0014] When it is detected that the output voltage values ​​of the two groups of driving power supplies are less than or equal to the preset voltage threshold, the output voltage of the driving power supply with a relatively higher temperature value is lowered within the output voltage range until the temperature difference reaches the preset temperature difference range;

[0015] When the output voltage of the driving power supply with a higher temperature is lowered to the lower limit value, and the temperature difference is still not within the preset temperature difference range, the output voltage of the driving power supply with a relatively lower temperature value is increased within the output voltage range until the temperature difference reaches within the preset temperature difference range.

[0016] In a further configuration of the present invention, the step of first adjusting the output voltage of the driving power supply with a higher temperature value and then adjusting the output voltage of the driving power supply with a relatively lower temperature value so that the temperature difference is within the preset temperature difference range includes:

[0017] If the temperature difference is still not within the preset temperature difference range after the output voltage of the driving power supply with a relatively low temperature value is adjusted up to the upper limit value, a fault alarm is issued.

[0018] According to a further configuration of the present invention, the step of obtaining the temperature values ​​of the key components of the two sets of driving power supplies further includes the following steps:

[0019] Obtain the output voltage values ​​of two sets of driving power supplies;

[0020] Compare the output voltage values ​​of the two groups of driving power supplies with a preset voltage threshold;

[0021] If the output voltage values ​​of the two sets of driving power supplies exceed the preset voltage threshold, a fault alarm is issued. If the output voltage values ​​of the two sets of driving power supplies are within the range of the preset voltage threshold, it is confirmed whether the temperature values ​​of the two sets of driving power supplies are within the qualified range.

[0022] According to a further configuration of the present invention, the step of confirming whether the temperature values ​​of the two groups of driving power supplies are within a qualified range, and if the temperature values ​​of the two groups of driving power supplies are within a qualified range, then confirming whether the temperature difference between the temperature values ​​of the two groups of driving power supplies is within a preset temperature difference range comprises:

[0023] Confirm whether the temperature values ​​of the two sets of drive power supplies are within the reliable temperature threshold range;

[0024] If the temperature values ​​of the two sets of driving power supplies are both within the reliable temperature threshold range, the output voltages of the two driving power supplies are not adjusted.

[0025] According to a further configuration of the present invention, the preset temperature difference range is 5-10 degrees.

[0026] In a second aspect, the present invention further provides a power control circuit of a vehicle cabin lighting system driving power supply based on the power control method of the vehicle cabin lighting system driving power supply described above, which comprises a first driving power supply and a second driving power supply;

[0027] The first driving power supply includes a first output voltage detection unit, a first temperature detection unit, a first micro control unit, a first output feedback control unit and a first fault alarm unit; the second driving power supply includes a second output voltage detection unit, a second temperature detection unit, a second micro control unit, a second output feedback control unit and a second fault alarm unit;

[0028] The first output voltage detection unit is connected to the first output feedback control unit, and is used to detect the output voltage value of the first driving power supply and control the first output feedback control unit to adjust the magnitude of the output voltage value;

[0029] The first temperature detection unit is connected to the first micro control unit and is used to detect the temperature of the key components of the first driving power supply and feed back the temperature value to the first micro control unit;

[0030] The first micro control unit is connected to the second micro control unit and is used to adjust the output voltage value of the first driving power supply according to the temperature value of the first driving power supply and the temperature value of the second driving power supply;

[0031] The first fault alarm unit is connected to the first micro control unit for providing an alarm prompt;

[0032] The second output voltage detection unit is connected to the second output feedback control unit, and is used to detect the output voltage value of the second driving power supply and control the second output feedback control unit to adjust the output voltage value;

[0033] The second temperature detection unit is connected to the second micro control unit and is used to detect the temperature of the key components of the second driving power supply and feed back the temperature value to the second micro control unit;

[0034] The second micro control unit is connected to the first micro control unit and is used to adjust the output voltage value of the second driving power supply according to the temperature value of the second driving power supply and the temperature value of the first driving power supply;

[0035] The second fault alarm unit is connected to the second micro control unit for providing an alarm prompt.

[0036] In a further configuration of the present invention, the first output voltage detection unit includes: a first resistor, a second resistor and a first operational amplifier; one end of the first resistor is connected to the positive output end of the first driving power supply, and the other end of the first resistor is connected to the second resistor; the other end of the second resistor is grounded; the common end of the first resistor and the second resistor is connected to the in-phase input end of the first operational amplifier;

[0037] The first output feedback control unit includes: a third resistor, a fourth resistor, a first optical coupler and a first DC-DC control chip; one end of the third resistor is connected to the output feedback control pin of the first DC-DC control chip, and the other end of the third resistor is connected to the receiving side of the first optical coupler; the transmitting side of the first optical coupler is respectively connected to the output end of the first operational amplifier and one end of the fourth resistor, and the other end of the fourth resistor is connected to the first power supply voltage;

[0038] The first temperature detection unit includes a first temperature detection resistor and a fifth resistor; the first temperature detection resistor is arranged on a key element of the first driving power supply, one end of the first temperature detection resistor is grounded, and the other end of the first temperature detection resistor is connected to one end of the fifth resistor and the second feedback end of the first driving power supply; the other end of the fifth resistor is connected to the second power supply voltage;

[0039] The second feedback terminal of the first driving power supply is connected to the first feedback terminal of the second driving power supply;

[0040] The first fault alarm unit comprises a first light emitting diode, an anode of the first light emitting diode is connected to the third pin of the first micro control unit, and a cathode of the first light emitting diode is grounded.

[0041] In a further configuration of the present invention, the second output voltage detection unit includes: a sixth resistor, a seventh resistor and a second operational amplifier; one end of the sixth resistor is connected to the positive output end of the second driving power supply, and the other end of the sixth resistor is connected to the seventh resistor; the other end of the seventh resistor is grounded; the common end of the sixth resistor and the seventh resistor is connected to the in-phase input end of the second operational amplifier;

[0042] The second output feedback control unit includes: an eighth resistor, a ninth resistor, a second optical coupler and a second DC-to-DC control chip; one end of the eighth resistor is connected to the output feedback control pin of the second DC-to-DC control chip, and the other end of the ninth resistor is connected to the receiving side of the second optical coupler; the transmitting side of the second optical coupler is respectively connected to the output end of the second operational amplifier and one end of the ninth resistor, and the other end of the ninth resistor is connected to the first power supply voltage;

[0043] The second temperature detection unit includes a second temperature detection resistor and a tenth resistor; the second temperature detection resistor is arranged on a key element of the second driving power supply, one end of the second temperature detection resistor is grounded, and the other end of the second temperature detection resistor is connected to one end of the tenth resistor and the second feedback end of the second driving power supply; the other end of the tenth resistor is connected to the second power supply voltage;

[0044] The second feedback terminal of the second driving power supply is connected to the first feedback terminal of the first driving power supply;

[0045] The second fault alarm unit comprises a second light emitting diode, an anode of the second light emitting diode is connected to the third pin of the second micro control unit, and a cathode of the second light emitting diode is grounded.

[0046] In a third aspect, the present invention further provides a lighting system, which includes a power control circuit of a driving power supply of a vehicle compartment lighting system as described above.

[0047] The present invention provides a power control method, circuit and lighting system for a driving power supply of a vehicle compartment lighting system. The lighting driving system includes two groups of driving power supplies. The method includes the steps of: obtaining the temperature values ​​of key components of the two groups of driving power supplies; confirming whether the temperature values ​​of the two groups of driving power supplies are within a qualified range, and if the temperature values ​​of the two groups of driving power supplies are within a qualified range, confirming whether the temperature difference of the temperature values ​​of the two groups of driving power supplies is within a preset temperature difference range; if the temperature difference is not within the preset temperature difference range, obtaining the output voltage values ​​of the two groups of driving power supplies; if the output voltage values ​​of the two groups of driving power supplies are less than or equal to the preset voltage threshold, adjusting the output voltage of the driving power supply with a relatively high temperature value so that the temperature difference is within the preset temperature difference range, or first adjusting the output voltage of the driving power supply with a relatively high temperature value and then adjusting the output voltage of the driving power supply with a relatively low temperature so that the temperature difference is within the preset temperature difference range. The present invention monitors the temperature values ​​of the two groups of driving power supplies, dynamically adjusts the output voltage values ​​of the two groups of driving power supplies according to the temperature values ​​of the two groups of driving power supplies, and dynamically allocates the driving power of the two groups of driving power supplies in real time, so that the service life of the two groups of driving power supplies remains consistent, thereby improving the safety and reliability of the vehicle compartment lighting system. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary personnel in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0049] Figure 1 It is a flow chart of the power control method of the driving power supply of the vehicle compartment lighting system in the present invention.

[0050] Figure 2 It is a flow chart of a power control method of a driving power supply of a vehicle compartment lighting system in one embodiment of the present invention.

[0051] Figure 3 It is a circuit schematic diagram of a power control circuit of a driving power supply of a vehicle compartment lighting system in the present invention.

[0052] Marks in the accompanying drawings: 100, first driving power supply; 110, first output voltage detection unit; 120, first temperature detection unit; 130, first output feedback control unit; 140, first fault alarm unit; 200, second driving power supply; 210, second output voltage detection unit; 220, second temperature detection unit; 230, second output feedback control unit; 240, second fault alarm unit. DETAILED DESCRIPTION

[0053] The present invention provides a power control method, circuit and lighting system for a driving power supply of a vehicle compartment lighting system. In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0054] In the embodiments and the scope of the patent application, unless the text specifically defines the article, "a", "an", "the" and "the" may also include plural forms. If there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0055] It should be further understood that the wording "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when an element is said to be "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there can also be an intermediate element. In addition, the "connection" or "coupling" used here can include wireless connection or wireless coupling. The wording "and / or" used here includes all or any unit and all combinations of one or more items listed in association.

[0056] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined as herein.

[0057] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0058] Please also see Figure 1 and Figure 2 The present invention provides a preferred embodiment of a power control method for a cabin lighting system driving power supply.

[0059] In some embodiments, see Figure 1 Combined with Figure 2 The present invention provides a power control method for a driving power supply of a vehicle compartment lighting system. The lighting driving system includes two sets of driving power supplies. The method includes the steps of:

[0060] S100, obtaining temperature values ​​of key components of two sets of driving power supplies;

[0061] Specifically, the train lighting system includes two sets of driving power supplies, namely a first driving power supply and a second driving power supply. When the train compartment lighting system works normally, the two sets of driving power supplies drive the load to work at the same time, and the load can be an LED light string. When one of the driving power supplies fails, the other driving power supply can ensure that normal lighting is not affected. During the operation of the train compartment lighting system, the micro control unit of the driving power supply can obtain the temperature value of its own key components in real time.

[0062] S200, confirming whether the temperature values ​​of the two groups of driving power supplies are within a qualified range, and if the temperature values ​​of the two groups of driving power supplies are within the qualified range, confirming whether the temperature difference between the temperature values ​​of the two groups of driving power supplies is within a preset temperature difference range;

[0063] Specifically, the qualified range of the temperature value of the driving power supply refers to the range in which the driving power supply can work normally, wherein the qualified range includes a reliable temperature threshold. For example, the qualified temperature range of the driving power supply can be set to 70-100 degrees, wherein 70 degrees is the reliable temperature threshold. Below 70 degrees, there is no need to adjust the output voltage of the driving power supply, and 100 degrees is the upper limit value of the driving power supply. If the temperature of the key components of the driving power supply exceeds 100 degrees, a fault alarm is required.

[0064] The temperature difference of the temperature values ​​of the two sets of driving power supplies refers to the difference in the temperature values ​​of the two sets of driving power supplies. When the temperature values ​​of the two sets of driving power supplies differ greatly, the service life of the two sets of driving power supplies may be inconsistent. Generally, the temperature difference is normal within the range of 5-10 degrees. When both sets of driving power supplies are working within the normal range, the temperature difference of the two sets of driving power supplies can be further calculated. If the temperature difference of the two sets of driving power supplies exceeds the preset temperature difference range, the output voltage of one or both sets of driving power supplies needs to be adjusted. If the temperature difference of the two sets of driving power supplies is detected to be within the preset temperature difference range, the output voltage of the two sets of driving power supplies needs to be adjusted.

[0065] S300, if the temperature difference is not within the preset temperature difference range, obtaining output voltage values ​​of two sets of driving power supplies;

[0066] Specifically, when it is detected that the temperature difference between the two groups of driving power supplies is within the preset temperature difference range, it is necessary to first detect whether the output voltages of the two groups of driving power supplies are within the preset voltage threshold range. The output voltage threshold range of the driving power supply refers to the output voltage of the driving power supply having an upper limit value and a lower limit value. When it is detected that the temperature difference between the two groups of driving power supplies is not within the preset temperature difference range, it is first necessary to detect whether the output voltages of the two groups of driving power supplies are normal. If the output voltages of the two groups of driving power supplies exceed the upper limit value, it means that the driving power supply has been damaged. In other words, the output power of the driving power supply needs to be adjusted only when the driving power supply is still in a normal working state.

[0067] S400. If the output voltage values ​​of the two groups of driving power supplies are less than or equal to the preset voltage threshold, the output voltage of the driving power supply with a relatively higher temperature value is adjusted so that the temperature difference is within the preset temperature difference range, or the output voltage of the driving power supply with a higher temperature value is first adjusted and then the output voltage of the driving power supply with a relatively lower temperature value is adjusted so that the temperature difference is within the preset temperature difference range.

[0068] Specifically, when the two groups of driving power supplies are not damaged and the difference in the temperature values ​​of the two groups of driving power supplies is not within the preset temperature difference range, the output power of the driving power supplies needs to be adjusted. During the adjustment process, the output voltage of the driving power supply with a relatively higher temperature value is first adjusted until the temperature difference between the two groups of driving power supplies meets the requirement. If the output voltage of the driving power supply with a higher temperature has been lowered to the lower limit value, and the temperature difference between the two groups of driving power supplies still cannot meet the requirement, the output voltage of the other group of driving power supplies with a relatively lower temperature value is increased until the temperature values ​​of the two groups of driving power supplies meet the requirement.

[0069] In the above technical scheme, the present invention can monitor the health status of the train carriage lighting system in real time by monitoring the temperature values ​​of the two groups of driving power supplies, and dynamically adjust the output voltage values ​​of the two groups of driving power supplies according to the temperature values ​​of the two groups of driving power supplies, so as to dynamically allocate the driving power of the two groups of driving power supplies in real time, ensure that the temperature rise of the two groups of driving power supplies is basically consistent, and make the service life of the two groups of driving power supplies basically consistent, thereby improving the safety and reliability of the carriage lighting system.

[0070] In some embodiments, the step of obtaining the temperature values ​​of the key components of the two sets of driving power supplies also includes the following steps:

[0071] S110, obtaining output voltage values ​​of two sets of driving power supplies;

[0072] S120, comparing the output voltage values ​​of the two groups of driving power supplies with a preset voltage threshold;

[0073] S130: If the output voltage values ​​of the two groups of driving power supplies exceed the preset voltage threshold, a fault alarm is issued; if the output voltage values ​​of the two groups of driving power supplies are within the range of the preset voltage threshold, it is confirmed whether the temperature values ​​of the two groups of driving power supplies are within the qualified range.

[0074] Specifically, when the two sets of driving power supplies are powered on, that is, when the temperature values ​​of the two sets of driving power supplies need to be detected, the output voltages of the two sets of driving power supplies are detected first. When it is confirmed that the two sets of driving power supplies are in normal working state, the temperature values ​​of the two sets of driving power supplies are adjusted.

[0075] In some embodiments, the step of confirming whether the temperature values ​​of the two groups of driving power supplies are within a qualified range, and if the temperature values ​​of the two groups of driving power supplies are within a qualified range, then confirming whether the temperature difference between the temperature values ​​of the two groups of driving power supplies is within a preset temperature difference range comprises:

[0076] S210, confirming whether the temperature values ​​of the two sets of driving power supplies are both within the reliable temperature threshold range;

[0077] S220: If the temperature values ​​of the two sets of driving power supplies are both within the reliable temperature threshold range, the output voltages of the two driving power supplies are not adjusted.

[0078] Specifically, when it is detected that the temperature values ​​of the two groups of driving power supplies are both within the reliable temperature threshold range, for example, in the normal operating temperature of 70-100 degrees, when it is detected that the temperature values ​​of the two driving power supplies are both below 70 degrees, there is no need to adjust the output power of the two groups of driving power supplies.

[0079] In some embodiments, if the output voltage values ​​of the two groups of driving power supplies are less than or equal to the preset voltage threshold, then adjusting the output voltage of the driving power supply with a relatively higher temperature value so that the temperature difference is within the preset temperature difference range, or first adjusting the output voltage of the driving power supply with a higher temperature value and then adjusting the output voltage of the driving power supply with a relatively lower temperature so that the temperature difference is within the preset temperature difference range, the steps specifically include:

[0080] S410, when it is detected that the output voltage values ​​of the two groups of driving power supplies exceed the preset voltage threshold, a fault alarm is issued;

[0081] S420, when it is detected that the output voltage values ​​of the two groups of driving power supplies are less than or equal to the preset voltage threshold, lowering the output voltage of the driving power supply with a relatively higher temperature value within the output voltage range until the temperature difference reaches the preset temperature difference range;

[0082] S430. When the output voltage of the driving power supply with a higher temperature is lowered to a lower limit value, and the temperature difference is still not within the preset temperature difference range, the output voltage of the driving power supply with a relatively lower temperature value is increased within the output voltage range until the temperature difference reaches within the preset temperature difference range.

[0083] Specifically, when it is detected that the temperature difference between the two groups of driving power supplies is not within the preset temperature difference range, and the output voltages of the two groups of driving power supplies are normal, firstly, the output voltage of the driving power supply with a relatively higher temperature value is adjusted down within the output voltage range of the driving power supply, and the temperature difference between the two groups of driving power supplies is calculated each time the adjustment is made. If the temperature difference still does not meet the requirement, the output voltage of the driving power supply with a relatively higher temperature value is further adjusted down until the temperature difference is adjusted to meet the requirement.

[0084] If the output voltage of the driving power supply with a relatively high temperature value has been reduced to the lower limit value, and the temperature difference between the two groups of driving power supplies still does not meet the requirements, the output voltage of the driving power supply with a relatively low temperature value will be increased, and the temperature difference between the two groups of driving power supplies will be calculated each time it is increased until the temperature difference between the two groups of driving power supplies meets the requirements.

[0085] In some embodiments, the step of first adjusting the output voltage of the driving power supply with a higher temperature value and then adjusting the output voltage of the driving power supply with a relatively lower temperature value so that the temperature difference is within the preset temperature difference range includes:

[0086] S440: If the temperature difference is still not within the preset temperature difference range after the output voltage of the driving power supply with a relatively low temperature value is increased to the upper limit value, a fault alarm is issued.

[0087] Specifically, when the output voltage of a driving power supply with a relatively high temperature value is adjusted to the lower limit value, and the output voltage of a driving power supply with a relatively low temperature value has also been increased to the upper limit value, and the temperature difference of the key components of the two groups of driving power supplies still does not meet the requirements, a fault alarm is performed, indicating that the driving power supply has failed or is damaged and needs maintenance.

[0088] In some embodiments, Figure 3As shown, the present invention also provides a power control circuit of a cabin lighting system driving power supply based on the power control method of the cabin lighting system driving power supply described above, which includes a first driving power supply 100 and a second driving power supply 200. The first driving power supply 100 includes a first output voltage detection unit 110, a first temperature detection unit 120, a first micro control unit, a first output feedback control unit 130 and a first fault alarm unit 140; the second driving power supply 200 includes a second output voltage detection unit 210, a second temperature detection unit 220, a second micro control unit, a second output feedback control unit 230 and a second fault alarm unit 240; the first output voltage detection unit 110 is connected to the first output feedback control unit 130, and is used to detect the output voltage value of the first driving power supply 100 and control the first output feedback control unit 130 to adjust the output voltage value; the first temperature detection unit 120 is connected to the first micro control unit, and is used to detect the temperature of the key components of the first driving power supply 100 and feed back the temperature value to the first micro control unit; the first micro control unit is connected to the second micro control unit, and is used to detect the temperature of the key components of the first driving power supply 100 and feed back the temperature value to the first micro control unit; the first micro control unit is connected to the second micro control unit, and is used to detect the temperature of the key components of the first driving power supply 100 and feed back the temperature value to the first micro control unit according to the first driving power supply 1 00 and the temperature value of the second driving power supply 200 adjust the output voltage value of the first driving power supply 100; the first fault alarm unit 140 is connected to the first micro control unit for alarm prompting; the second output voltage detection unit 210 is connected to the second output feedback control unit 230, for detecting the output voltage value of the second driving power supply 200 and controlling the second output feedback control unit 230 to adjust the size of the output voltage value; the second temperature detection unit 220 is connected to the second micro control unit, for detecting the temperature of the key components of the second driving power supply 200 and feeding back the temperature value to the second micro control unit; the second micro control unit is connected to the first micro control unit, for adjusting the output voltage value of the second driving power supply 200 according to the temperature value of the second driving power supply 200 and the temperature value of the first driving power supply 100; the second fault alarm unit 240 is connected to the second micro control unit for alarm prompting.

[0089] Specifically, the first driving power supply 100 and the second driving power supply 200 have the same circuit structure and the same working principle. The positive input terminal Vin+ and the negative input terminal Vin- of the first driving power supply 100 and the second driving power supply 200 are connected to the input voltage, and the positive output terminal Vout+ and the negative output terminal Vout- of the first driving power supply 100 and the second driving power supply 200 are both connected to the input terminal of the load.

[0090] The first output voltage detection unit 110 can detect the voltage at the output end of the first driving power supply 100. The first temperature detection unit 120 can detect the temperature of the key components of the first driving power supply 100, and feed back the temperature value to the first micro control unit MCU1 and the second micro control unit MCU2. The first output feedback control unit 130 is located at the primary power supply of the driving power supply, and the first output voltage detection unit 110, the first temperature detection unit 120, the first micro control unit MCU1 and the first fault alarm unit 140 are located at the secondary power supply. The first micro control unit can receive the temperature value of the key components of the first driving power supply 100 and the temperature value of the key components of the second driving power supply 200, so as to know the temperature difference between the first driving power supply 100 and the second driving power supply 200 after comparison, and to know which driving power supply has a higher temperature value, so as to control the first output voltage detection unit 110 to adjust the output capacity of the first output feedback control unit 130, so as to adjust the output voltage of the first driving power supply 100. The working principle of the second driving power supply 200 is the same as that of the first driving power supply 100, and will not be repeated here.

[0091] In some embodiments, the first output voltage detection unit 110 includes: a first resistor R1, a second resistor R2 and a first operational amplifier IC1; one end of the first resistor R1 is connected to the positive output end of the first driving power supply 100, and the other end of the first resistor R1 is connected to the second resistor R2; the other end of the second resistor R2 is grounded; the common end of the first resistor R1 and the second resistor R2 is connected to the in-phase input end of the first operational amplifier IC1; the first output feedback control unit 130 includes: a third resistor R3, a fourth resistor R4, a first optical coupler OP1 and a first DC-to-DC control chip IC2; one end of the third resistor R3 is connected to the output feedback control pin of the first DC-to-DC control chip IC2, and the other end of the third resistor R3 is connected to the receiving side OP1B of the first optical coupler OP1; the transmitting side OP1A of the first optical coupler OP1 is respectively connected to the output of the first operational amplifier IC1 The first temperature detection unit 120 includes a first temperature detection resistor Rt1 and a fifth resistor R5; the first temperature detection resistor Rt1 is arranged on a key component of the first driving power supply 100, one end of the first temperature detection resistor Rt1 is grounded, the other end of the first temperature detection resistor Rt1 is connected to one end of the fifth resistor R5 and the second feedback end FB2 of the first driving power supply 100; the other end of the fifth resistor R5 is connected to the second power supply voltage; the second feedback end FB2 of the first driving power supply 100 is connected to the first feedback end FB1 of the second driving power supply 200; the first fault alarm unit 140 includes a first light-emitting diode LED1, the anode of the first light-emitting diode LED1 is connected to the third pin of the first micro control unit MCU1, and the cathode of the first light-emitting diode LED1 is grounded.

[0092] Specifically, the first output voltage detection unit 110 is composed of a first resistor R1, a second resistor R2 and a first operational amplifier IC1. The first resistor R1 and the second resistor R2 are connected in series and connected in parallel to the positive output terminal Out+ and the negative output terminal Out- of the first driving power supply 100. The voltage division value of the first resistor R1 and the second resistor R2 is input to the non-inverting input terminal of the first operational amplifier IC1 to detect the output voltage, wherein the voltage of the non-inverting input terminal of the first operational amplifier IC1 is the reference voltage of the output voltage of the first driving power supply 100.

[0093] The first output feedback control unit 130 is composed of a third resistor R3, a fourth resistor R4, a first optocoupler OP1 and a first DC-to-DC control chip IC2. The first optocoupler OP1 can control the output capacity of the first optocoupler OP1 according to the output voltage output by the output terminal OUT1 of the first operational amplifier IC1, so as to further adjust the output capacity of the first DC-to-DC control chip IC2 through the first optocoupler OP1, thereby realizing the adjustment of the secondary output voltage. The first temperature detection unit 120 is composed of the first temperature detection resistor Rt1 and the fifth resistor R5. The first temperature detection resistor Rt1 is a temperature sensitive element, and the resistance value of the first temperature detection resistor Rt1 changes linearly with the change of temperature. The first temperature detection resistor Rt1 is installed on the surface of the key components of the first driving power supply 100 to dynamically detect the temperature of the key components of the first driving power supply 100. Among them, the second power supply voltage can be a 5V voltage, and the 5V voltage is divided in series by the fifth resistor and the first temperature detection resistor Rt1, and the voltage on the first temperature detection resistor Rt1 is input to the second pin of the first micro control unit, and the voltage on the second pin of the first micro control unit MCU1 directly reflects the temperature of the key components of the first driving power supply 100. At the same time, the voltage on the first temperature detection resistor Rt1 is input to the seventh pin of the second micro control unit MCU2 through the second feedback terminal FB2 of the first driving power supply 100 and the first feedback terminal FB1 of the second driving power supply 200, so as to form a temperature comparison circuit of the key components of the two groups of driving power supplies, that is, the first feedback terminal FB1 and the second feedback terminal FB2 of the two groups of driving power supplies are cross-connected, so as to realize the mutual detection of the feedback signals of the two groups of driving power supplies. The first light emitting diode LED1 is connected to the third pin of the first microcontroller unit MCU1. When the first microcontroller unit MCU1 detects that the temperature of the first driving power supply 100 is out of the qualified range, that is, higher than the maximum value of the qualified range, or the output voltage is out of the output voltage range, that is, higher than the maximum value of the output voltage, or the temperature difference between the two groups of driving power supplies is greater than the preset temperature difference range and the output voltage cannot be adjusted to within the preset temperature difference range, the first microcontroller unit MCU1 drives the first light emitting diode LED1 to light up to remind the staff to perform maintenance.

[0094] Furthermore, the second output voltage detection unit 210 includes: a sixth resistor R6, a seventh resistor R7 and a second operational amplifier IC3; one end of the sixth resistor R6 is connected to the positive output terminal Out+ of the second driving power supply 200, and the other end of the sixth resistor R6 is connected to the seventh resistor R7; the other end of the seventh resistor R7 is grounded; the common end of the sixth resistor R6 and the seventh resistor R7 is connected to the in-phase input end of the second operational amplifier IC3; the second output feedback control unit 230 includes: an eighth resistor R8, a ninth resistor R9, a second optical coupler OP2 and a second DC-to-DC control chip IC4; one end of the eighth resistor R8 is connected to the output feedback control pin of the second DC-to-DC control chip IC4, and the other end of the ninth resistor R9 is connected to the receiving side OP2B of the second optical coupler OP2; the transmitting side OP2A of the second optical coupler OP2 is respectively connected to the output of the second operational amplifier IC3 The second temperature detection unit 220 includes a second temperature detection resistor Rt2 and a tenth resistor R10; the second temperature detection resistor Rt2 is arranged on a key component of the second driving power supply 200, one end of the second temperature detection resistor Rt2 is grounded, the other end of the second temperature detection resistor Rt2 is connected to one end of the tenth resistor R10 and a second feedback end FB2 of the second driving power supply 200; the other end of the tenth resistor R10 is connected to the second power supply voltage; the second feedback end FB2 of the second driving power supply 200 is connected to the first feedback end FB1 of the first driving power supply 100; the second fault alarm unit 240 includes a second light-emitting diode LED2, the anode of the second light-emitting diode LED2 is connected to the third pin of the second micro control unit MCU2, and the cathode of the second light-emitting diode LED2 is grounded.

[0095] Specifically, the working principles of the second output voltage detection unit 210, the second temperature detection unit 220, the second microcontroller unit MCU2, the second output feedback control unit 230, and the second fault alarm unit 240 are similar to those of the first output voltage detection unit 110, the first temperature detection unit 120, the first microcontroller unit MCU1, the first output feedback control unit 130, and the first fault alarm unit 140. The difference is that after the 5V voltage is divided by the second temperature detection resistor Rt2 and the tenth resistor R10 in series, the voltage of the second temperature detection resistor Rt2 is input to the second pin of the second microcontroller unit, and at the same time, it is sequentially input to the seventh pin of the first microcontroller unit MCU1 through the second feedback terminal FB2 of the second microcontroller unit MCU2 and the first feedback terminal FB1 of the first microcontroller unit MCU1 to form a temperature comparison circuit for the key components of two groups of driving power supplies.

[0096] During specific implementation, the first microcontroller unit MCU1 and the second microcontroller unit MCU2 analyze and calculate the signals of pins 2 and 7 to determine whether the temperature of the key component of the first driving power supply 100 or the second driving power supply 200 is higher than that of the other driving power supply, and further determine whether the temperature difference exceeds a preset temperature difference range. If it exceeds the preset temperature difference range, a corresponding signal is output through pin 4 of the first microcontroller unit MCU1 to the inverting input terminal (pin 2) of the first operational amplifier IC1, or a corresponding signal is output through the second microcontroller unit MCU2 to the inverting input terminal (pin 2) of the second operational amplifier IC3.

[0097] Taking the first driving power supply 100 as an example, if the output voltage of the first driving power supply 100 needs to be reduced, the 4th pin of the first microcontroller unit MCU1 outputs a corresponding signal to control the voltage of the pin 2 of the first operational amplifier IC1 to decrease, and the voltage of the pin 1 of the first operational amplifier IC1 increases, the current of the transmitting side OP1A of the first optical coupler OP1 decreases, and the receiving side OP1B is connected to the output feedback control pin of the first DC-to-DC control chip IC2 at the primary of the power supply. Since the current of the receiving side OP1B of the first optical coupler OP1 decreases, the output capacity of the first DC-to-DC control chip IC2 is adjusted through the first optical coupler OP1. At the same time, since the voltage of the pin 3 of the first operational amplifier IC1 is the reference voltage Vref of the output voltage of the first driving power supply 100, if the reference voltage decreases, because the output voltage Vout=(R1+R2)Vref / R2, where R1 is the resistance value of the first resistor and R2 is the resistance value of the second resistor, it can be seen that the output voltage Vout decreases at the same time, so that the load is reduced and the temperature decreases;

[0098] On the contrary, if the output voltage of the first driving power supply 100 needs to be increased, the 4th pin of the first micro-control unit MCU1 outputs a corresponding signal to control the voltage of the pin 2 of the first operational amplifier IC1 to rise, and the voltage of the pin 1 of the first operational amplifier IC1 drops, the current of the transmitting side OP1A of the first optical coupler OP1 increases, and the receiving side OP1B is connected to the output feedback control pin of the first DC-to-DC control chip IC2 at the primary of the power supply. Due to the increase in the current of the receiving side OP1B of the first optical coupler OP1, the output capacity of the first DC-to-DC control chip IC2 is adjusted. At the same time, because the voltage of the pin 3 of the first operational amplifier IC1 is the reference voltage Vref of the output voltage of the first driving power supply 100, if the reference voltage rises, because the output voltage Vout=(R1+R2)Vref / R2, it can be seen that the output voltage Vout rises at the same time, which increases the load and the temperature.

[0099] In one implementation, the first micro control unit MCU1 and the second micro control unit MCU2 may be micro control units of model PIC12F617.

[0100] In some embodiments, the present invention further provides a lighting system, which includes the power control circuit of the vehicle compartment lighting system driving power supply as described above. Specifically, as described in the power control circuit of the vehicle compartment lighting system driving power supply, it will not be repeated here.

[0101] In summary, the power control method, circuit and lighting system of a vehicle compartment lighting system driving power supply provided by the present invention have the following beneficial effects:

[0102] By monitoring the temperature values ​​of the two sets of driving power supplies, the health status of the train compartment lighting system can be monitored in real time;

[0103] The output voltage values ​​of the two groups of driving power supplies are dynamically adjusted according to their temperature values, so as to dynamically allocate the driving power of the two groups of driving power supplies in real time, thereby ensuring that the temperature rise of the two driving power supplies is basically consistent, so that the service life of the two groups of driving power supplies is basically consistent, thereby improving the safety and reliability of the car lighting system.

[0104] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A power control method for a driving power supply of a carriage lighting system, wherein the lighting driving system includes two sets of driving power supplies. When the train carriage lighting system works normally, the two sets of driving power supplies drive the load to work at the same time, and the load is an LED light string. When one of the driving power supplies fails, the other driving power supply can ensure that the normal lighting is not affected, characterized in that: The method comprises the steps of: Obtain the temperature values ​​of key components of two sets of driving power supplies; Confirm whether the temperature values ​​of the two sets of driving power supplies are within the qualified range. If the temperature values ​​of the two sets of driving power supplies are within the qualified range, then confirm whether the temperature difference between the temperature values ​​of the two sets of driving power supplies is within the preset temperature difference range; If the temperature difference is not within the preset temperature difference range, then obtaining output voltage values ​​of two sets of driving power supplies; If the output voltage values ​​of the two groups of driving power supplies are less than or equal to the preset voltage threshold, the output voltage of the driving power supply with a relatively higher temperature value is adjusted so that the temperature difference is within the preset temperature difference range, or the output voltage of the driving power supply with a higher temperature value is adjusted first and then the output voltage of the driving power supply with a relatively lower temperature value is adjusted so that the temperature difference is within the preset temperature difference range; When it is detected that the output voltage values ​​of the two groups of driving power supplies exceed the preset voltage threshold, a fault alarm is issued; When it is detected that the output voltage values ​​of the two groups of driving power supplies are less than or equal to the preset voltage threshold, the output voltage of the driving power supply with a relatively higher temperature value is lowered within the output voltage range, and the temperature difference between the two groups of driving power supplies is calculated each time the adjustment is made until the temperature difference reaches the preset temperature difference range; When the output voltage of the driving power supply with a higher temperature is lowered to the lower limit value, and the temperature difference is still not within the preset temperature difference range, the output voltage of the driving power supply with a relatively lower temperature value is increased within the output voltage range, and the temperature difference between the two groups of driving power supplies is calculated each time the temperature difference is increased until the temperature difference reaches the preset temperature difference range.

2. The power control method of the vehicle compartment lighting system driving power supply according to claim 1, characterized in that: The step of first adjusting the output voltage of the driving power supply with a higher temperature value and then adjusting the output voltage of the driving power supply with a relatively lower temperature value so that the temperature difference is within the preset temperature difference range includes: If the temperature difference is still not within the preset temperature difference range after the output voltage of the driving power supply with a relatively low temperature value is adjusted up to the upper limit value, a fault alarm is issued.

3. The power control method of the vehicle compartment lighting system driving power supply according to claim 1, characterized in that: The step of obtaining the temperature values ​​of the key components of the two sets of driving power supplies also includes the following steps: Obtain the output voltage values ​​of two sets of driving power supplies; Compare the output voltage values ​​of the two groups of driving power supplies with a preset voltage threshold; If the output voltage values ​​of the two sets of driving power supplies exceed the preset voltage threshold, a fault alarm is issued. If the output voltage values ​​of the two sets of driving power supplies are within the range of the preset voltage threshold, it is confirmed whether the temperature values ​​of the two sets of driving power supplies are within the qualified range.

4. The power control method of the vehicle compartment lighting system driving power supply according to claim 1, characterized in that: The step of confirming whether the temperature values ​​of the two groups of driving power supplies are within the qualified range, and if the temperature values ​​of the two groups of driving power supplies are within the qualified range, then confirming whether the temperature difference between the temperature values ​​of the two groups of driving power supplies is within the preset temperature difference range comprises: Confirm whether the temperature values ​​of the two sets of drive power supplies are within the reliable temperature threshold range; If the temperature values ​​of the two sets of driving power supplies are both within the reliable temperature threshold range, the output voltages of the two sets of driving power supplies are not adjusted.

5. The power control method of the vehicle compartment lighting system driving power supply according to claim 1, wherein The characteristic is that the preset temperature difference range is 5-10 degrees.

6. A power control circuit of a vehicle cabin lighting system driving power supply based on the power control method of a vehicle cabin lighting system driving power supply according to any one of claims 1 to 5, characterized in that: It includes a first driving power source and a second driving power source; The first driving power supply includes a first output voltage detection unit, a first temperature detection unit, a first micro control unit, a first output feedback control unit and a first fault alarm unit; the second driving power supply includes a second output voltage detection unit, a second temperature detection unit, a second micro control unit, a second output feedback control unit and a second fault alarm unit; The first output voltage detection unit is connected to the first output feedback control unit, and is used to detect the output voltage value of the first driving power supply and control the first output feedback control unit to adjust the magnitude of the output voltage value; The first temperature detection unit is connected to the first micro control unit and is used to detect the temperature of the key components of the first driving power supply and feed back the temperature value to the first micro control unit; The first micro control unit is connected to the second micro control unit and is used to adjust the output voltage value of the first driving power supply according to the temperature value of the first driving power supply and the temperature value of the second driving power supply; The first fault alarm unit is connected to the first micro control unit for providing an alarm prompt; The second output voltage detection unit is connected to the second output feedback control unit, and is used to detect the output voltage value of the second driving power supply and control the second output feedback control unit to adjust the output voltage value; The second temperature detection unit is connected to the second micro control unit and is used to detect the temperature of the key components of the second driving power supply and feed back the temperature value to the second micro control unit; The second micro control unit is connected to the first micro control unit and is used to adjust the output voltage value of the second driving power supply according to the temperature value of the second driving power supply and the temperature value of the first driving power supply; The second fault alarm unit is connected to the second micro control unit for providing an alarm prompt.

7. The power control circuit of the vehicle compartment lighting system driving power supply according to claim 6, characterized in that: The first output voltage detection unit includes: a first resistor, a second resistor and a first operational amplifier; one end of the first resistor is connected to the positive output end of the first driving power supply, and the other end of the first resistor is connected to the second resistor; the other end of the second resistor is grounded; the common end of the first resistor and the second resistor is connected to the non-inverting input end of the first operational amplifier; The first output feedback control unit includes: a third resistor, a fourth resistor, a first optical coupler and a first DC-DC control chip; one end of the third resistor is connected to the output feedback control pin of the first DC-DC control chip, and the other end of the third resistor is connected to the receiving side of the first optical coupler; the transmitting side of the first optical coupler is respectively connected to the output end of the first operational amplifier and one end of the fourth resistor, and the other end of the fourth resistor is connected to the first power supply voltage; The first temperature detection unit includes a first temperature detection resistor and a fifth resistor; the first temperature detection resistor is arranged on a key element of the first driving power supply, one end of the first temperature detection resistor is grounded, and the other end of the first temperature detection resistor is connected to one end of the fifth resistor and the second feedback end of the first driving power supply; the other end of the fifth resistor is connected to the second power supply voltage; The second feedback terminal of the first driving power supply is connected to the first feedback terminal of the second driving power supply; The first fault alarm unit comprises a first light emitting diode, an anode of the first light emitting diode is connected to the third pin of the first micro control unit, and a cathode of the first light emitting diode is grounded.

8. The power control circuit of the vehicle compartment lighting system driving power supply according to claim 7, characterized in that: The second output voltage detection unit includes: a sixth resistor, a seventh resistor and a second operational amplifier; one end of the sixth resistor is connected to the positive output end of the second driving power supply, and the other end of the sixth resistor is connected to the seventh resistor; the other end of the seventh resistor is grounded; the common end of the sixth resistor and the seventh resistor is connected to the non-inverting input end of the second operational amplifier; The second output feedback control unit includes: an eighth resistor, a ninth resistor, a second optical coupler and a second DC-to-DC control chip; one end of the eighth resistor is connected to the output feedback control pin of the second DC-to-DC control chip, and the other end of the ninth resistor is connected to the receiving side of the second optical coupler; the transmitting side of the second optical coupler is respectively connected to the output end of the second operational amplifier and one end of the ninth resistor, and the other end of the ninth resistor is connected to the first power supply voltage; The second temperature detection unit includes a second temperature detection resistor and a tenth resistor; the second temperature detection resistor is arranged on a key element of the second driving power supply, one end of the second temperature detection resistor is grounded, and the other end of the second temperature detection resistor is connected to one end of the tenth resistor and the second feedback end of the second driving power supply; the other end of the tenth resistor is connected to the second power supply voltage; The second feedback terminal of the second driving power supply is connected to the first feedback terminal of the first driving power supply; The second fault alarm unit comprises a second light emitting diode, an anode of the second light emitting diode is connected to the third pin of the second micro control unit, and a cathode of the second light emitting diode is grounded.

9. A lighting system, characterized in that: A power control circuit comprising a driving power supply for a vehicle compartment lighting system as claimed in any one of claims 6 to 8.

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