CN111194114B - Current control device, working method, constant current driving system and heat balance method - Google Patents
Current control device, working method, constant current driving system and heat balance method Download PDFInfo
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- CN111194114B CN111194114B CN201811345819.6A CN201811345819A CN111194114B CN 111194114 B CN111194114 B CN 111194114B CN 201811345819 A CN201811345819 A CN 201811345819A CN 111194114 B CN111194114 B CN 111194114B
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Abstract
The invention provides a current control device, a working method, a constant current driving system and a heat balance method, which comprise the following steps: when the working environment temperature is within the first set temperature, the output current capability of the current control device is constant; when the working environment temperature is between the first set temperature and the second set temperature, the output current capacity of the current control device is gradually increased along with the increase of the working environment temperature; when the working environment temperature is between the second set temperature and the third set temperature, the output current capability of the current control device is gradually reduced along with the increase of the working environment temperature. The invention realizes constant current drive by adopting a series connection mode of the current control devices, and ensures that different current control devices generate heat uniformly and reduce the system temperature by controlling the relation curve of the current output capability and the temperature of each current control device.
Description
Technical Field
The invention relates to the field of LED control, in particular to a current control device, a working method, a constant current driving system and a heat balance method.
Background
In some LED applications, a constant current diode is usually used to drive the LED in consideration of cost, and in this case, the constant current diode needs to bear the redundant voltage after the power supply consumes on the LED, so that the power consumption is large when the input voltage is high, the heat generation is serious, and the temperature rise affects the reliability of the system.
In order to reduce the temperature of the constant current diode, firstly, the heat dissipation can be enhanced, such as large packaging or radiating fins are used; and secondly, heat can be shared by a plurality of constant current diodes which are used in parallel or in series. For the solution of using a large package or a heat sink to enhance heat dissipation, the large package and heat sink will inevitably result in increased cost, and the increase of the package and the increase of the heat sink cannot be realized under the condition that much space is limited. For the scheme of realizing heat sharing by adopting the parallel connection of the constant current diodes, the current value of each constant current diode is one-N of the original current value, and the constant current diodes have no more specifications to be selected, so the realization is easy to be limited.
For the scheme of realizing heat sharing by serially connecting the constant current diodes, although the current specifications are easy to select, the current flowing through different constant current diodes has difference, so that the bearing voltage with large current is low, the bearing voltage with small current is high, one bearing highest voltage and the other bearing lowest voltage are always high, the temperature bearing the highest voltage is highest, and the heat generation is maximum, so that the two constant current diodes do not play a role in sharing the power consumption averagely, and the constant current diode with large heat generation still has the problem of influencing the system reliability.
Therefore, how to effectively solve the problem of system reliability caused by the heat generation of the constant current diode has become one of the problems to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention aims to provide a current control device, an operating method, a constant current driving system and a thermal balancing method, which are used for solving the problem of system reliability caused by the heat generation of the constant current diode in the prior art.
To achieve the above and other related objects, the present invention provides a current control device, comprising at least:
the device comprises a power switch tube, a sampling unit, a temperature detection unit, a reference control unit and a comparison unit;
the temperature detection unit is used for detecting the temperature of a working environment;
the reference control unit is connected with the output end of the temperature detection unit and generates a corresponding reference signal based on the detected working environment temperature;
the sampling unit is connected with the output end of the power switch tube and is used for detecting the output current of the power switch tube;
the comparison unit is connected with the output ends of the reference control unit and the sampling unit and is used for comparing the reference signal with the output signal of the sampling unit to generate a corresponding control signal;
and the grid electrode of the power switch tube is connected with the output end of the comparison unit, and the current flowing through the power switch tube is adjusted based on the control signal.
To achieve the above and other related objects, the present invention provides a method for operating a current control device, the method at least comprising:
when the working environment temperature of the current control device is within a first set temperature, the output current capability of the current control device is constant;
when the working environment temperature of the current control device is between a first set temperature and a second set temperature, the output current capability of the current control device is gradually increased along with the increase of the working environment temperature;
when the working environment temperature of the current control device is between the second set temperature and a third set temperature, the output current capability of the current control device is gradually reduced along with the increase of the working environment temperature;
wherein the first set temperature, the second set temperature, and the third set temperature are sequentially increased.
Optionally, between the first set temperature and the second temperature, the current control device increases the output current capability linearly, and the maximum output current capability is Io (1+ x%); where Io is the constant output current capability and x% is the offset set point.
Optionally, between the second set temperature and the third set temperature, the output current capability of the current control device is linearly reduced, and the minimum output current capability is 0.
To achieve the above and other related objects, the present invention provides a constant current driving system, which at least includes:
the voltage input module is connected with a load at the output end of the voltage input module, and the constant current control module is connected with the load in series;
wherein, the constant current control module comprises at least two current control devices connected in series.
Optionally, the load comprises a string of LED lights.
In order to achieve the above and other related objects, the present invention provides a thermal balance method of the above constant current driving system, the thermal balance method at least including:
when the working environment temperature of the first current control device exceeds a first set temperature, the output current capacity of the first current control device is gradually increased along with the increase of the working environment temperature; until the output current capability of the first current control device is larger than that of the second current control device, the temperature of the first current control device is not increased any more, and the temperature of the second current control device is increased;
when the working environment temperature of the second current control device exceeds the first set temperature, the output current capability of the second current control device is gradually increased along with the increase of the working environment temperature; until the output current capability of the second current control device is larger than that of the first current control device, the temperature of the second current control device is not increased any more, and the temperature of the first current control device is increased;
the first set temperature and the second set temperature are a thermal balance interval of the system, in the interval, the first current control device and the second current control device are heated up alternately to share heat until reaching a balance point, and at the moment, the working environment temperatures of the first current control device and the second current control device are equal;
wherein the constant output current capability of the first current control device is less than the constant output current capability of the second current control device, and the first set temperature is less than the second set temperature.
Optionally, the temperature below the first set temperature is a safe operating temperature interval of the system, in which each current control device operates at a constant output current capability, and each current control device operates at a constant current of the constant output current capability of the first current control device.
More optionally, below the second set temperature, the system operates normally.
Optionally, the second set temperature to the third set temperature are a thermal protection interval of the system, in this interval, the output current capability of the current control device with the working environment temperature greater than the second set temperature is gradually reduced along with the increase of the working environment temperature, and other current control devices do not heat any more; wherein the third set temperature is greater than the second set temperature.
As described above, the current control device, the operating method, the constant current driving system and the thermal balance method according to the present invention have the following advantageous effects:
the invention realizes constant current drive by adopting a series connection mode of the current control devices, and can balance the heating on the system when different current control devices are connected in series by controlling the relation curve of the current output capability and the temperature of each current control device, thereby reducing the system temperature and further solving the problem of system reliability caused by the heating of the current control devices.
Drawings
Fig. 1 is a schematic structural diagram of a constant current driving system according to the present invention.
Fig. 2 is a schematic diagram illustrating an internal structure of the current control apparatus according to the present invention.
FIG. 3 is a schematic diagram showing a characteristic curve of the current output capability of the current control apparatus according to the present invention.
Description of the element reference numerals
1 constant current driving system
11 voltage input module
12 load
13 constant current control module
21 temperature detection unit
22 reference control unit
23 comparison unit
24 operating voltage generating unit
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Please refer to fig. 1 to 3. It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
Example one
As shown in fig. 1, the present embodiment provides a constant current driving system 1, where the constant current driving system 1 includes:
the device comprises a voltage input module 11, a load 12 and a constant current control module 13.
As shown in fig. 1, the voltage input module 11 receives an AC power AC and converts the AC power AC into an input voltage Vin.
Specifically, in this embodiment, the voltage input module 11 includes a rectifier bridge, the rectifier bridge includes two diode groups connected in parallel, each diode group includes two diodes connected in series, the AC power source AC is connected between the two diodes of each diode group, the voltage input module 11 outputs the input voltage Vin, and the input voltage Vin is a rectified voltage obtained by rectifying a sinusoidal voltage that continuously increases or continuously decreases.
As shown in fig. 1, the load 12 is connected to the output end of the voltage input module 11, and is powered by the voltage input module 11.
Specifically, in this embodiment, the load 12 is an LED light string, which includes a plurality of LED lights (LEDs 1-LEDn) connected in series, and the LED light string may also be a series-parallel structure of a plurality of LED lights, which is not limited to this embodiment. The voltage input module 11 supplies power to the load 12, and when the voltage across the load 12 reaches its on-state voltage, the LEDs in the load 12 are lit up to perform an illumination function.
It should be noted that, in practical use, the load 12 may be any device requiring constant current control, and is not limited to this embodiment.
As shown in fig. 1, the constant current control module 13 is connected in series with the load 12, and is configured to perform constant current control on the load 12.
Specifically, the constant current control module 13 includes at least two current control devices connected in series, and in this embodiment, taking two current control devices as an example, in practical use, a plurality of current control devices connected in series may be included. As shown in fig. 1, the anode of the first current control device CRD1 is connected to the output terminal of the load 12, the cathode is connected to the anode of the second current control device CRD2, and the cathode of the second current control device CRD2 is grounded.
More specifically, as shown in fig. 2, the current control apparatus includes a power switch M, a sampling unit Rcs, a temperature detection unit 21, a reference control unit 22, a comparison unit 23, and an operating voltage generation unit 24. The current control device is similar to a diode in external characteristics, and therefore, can be divided into a constant current diode in terms of functional division. The temperature detection unit 21 is configured to detect a temperature of a working environment, in this embodiment, the temperature detection unit 21 includes a diode, and obtains temperature information based on an influence of a temperature on a PN junction of the diode. The reference control unit 22 is connected to an output end of the temperature detection unit 21, and generates a corresponding reference signal based on the detected working environment temperature. The sampling unit Rcs is connected to an output end of the power switch tube M and configured to detect an output current of the power switch tube M. The comparing unit 23 is connected to the output ends of the reference control unit 22 and the sampling unit Rcs, and configured to compare the reference signal with the output signal of the sampling unit Rcs to generate a corresponding control signal, in this embodiment, a positive phase input end of the comparing unit 23 is connected to the reference control unit 22, and a negative phase input end of the comparing unit 23 is connected to the sampling unit Rcs. The drain of the power switch tube M is used as the anode of the current control device, the source of the power switch tube M is used as the cathode of the current control device, the gate of the power switch tube M is connected to the output end of the comparison unit 23, and the current flowing through the power switch tube M is adjusted based on the control signal output by the comparison unit 23, so as to control the output current of the current control device.
It should be noted that the temperature detecting unit 21 may employ any device capable of detecting temperature, including but not limited to a thermosensitive device, a field effect transistor, and not limited to the diode of the embodiment. In practical use, the connection relationship between the input end of the comparing unit 23 and each unit may be reversed, and the logic relationship of the present invention may be realized by adjusting the phase through the inverter, which is not limited to this embodiment.
More specifically, as shown in fig. 3, the current control apparatus of the present invention has the following relationship of output current capability and temperature:
when the working environment temperature of the current control device is within the first set temperature T1, the output current capability of the current control device is constant.
Specifically, as shown in fig. 3, T0 to T1 are the safe operating temperature range of the current control device, where T0 is room temperature or a temperature lower than room temperature, and at this time, the current control device does not generate heat; the first set temperature T1 is the maximum temperature allowed by the normal operation of the current control device, the first set temperature T1 is higher than T0, and the first set temperature T1 can be set according to the specific performance of the current control device, which is not particularly limited herein. In the interval T0 to T1, the output current capability of the current control device is constant, and the output current is the set current Io.
When the working environment temperature of the current control device is between a first set temperature T1 and a second set temperature T2, the output current capability of the current control device is gradually increased along with the increase of the working environment temperature.
Specifically, as shown in fig. 3, T1 to T2 are thermal equilibrium regions of the current control device, where T2 is the highest temperature allowed to occur during system thermal equilibrium, the second set temperature T2 is higher than the first set temperature T1, and the second set temperature T2 may be set according to specific performance of the current control device, which is not particularly limited herein. In the interval from T1 to T2, the output current capability of the current control device increases linearly with the increase of the temperature of the working environment until reaching the set maximum value Io (1+ x%), wherein x% is a deviation set value considering the system precision and can be set according to actual needs.
When the working environment temperature of the current control device is between the second set temperature T2 and the third set temperature T3, the output current capability of the current control device is gradually reduced along with the increase of the working environment temperature.
Specifically, as shown in fig. 3, T2 to T3 are thermal protection regions of the current control device, the third set temperature T3 is the highest temperature that the current control device can bear, damage to the current control device may be caused by exceeding the third set temperature T3, the third set temperature T3 is higher than the second set temperature T2, and the third set temperature T3 may be set according to specific performance of the current control device, which is not particularly limited herein. In the interval from T2 to T3, the output current capability of the current control device is linearly reduced along with the increase of the temperature of the working environment until the output current capability of the current control device is reduced to zero.
It should be noted that the output current capability of the current control device may change nonlinearly with the temperature of the working environment, and is not limited to this embodiment.
The current control device is not limited to the configuration of the present embodiment, and any configuration that can realize the output current capability and the temperature characteristic curve of the current control device of the present invention is applicable to the present invention.
Example two
In this embodiment, the thermal balance method of the constant current driving system is based on the constant current driving system 1, and the first current control device CRD1 is connected in series with the second current control device CRD2, and since the output current capabilities cannot be consistent, it is assumed that the constant output current capability of the first current control device CRD1 is smaller than that of the second current control device CRD 2. The internal impedance of the first current control device CRD1 is relatively high, and the first current control device CRD1 shares a large voltage, generates more heat and has a high temperature; the internal impedance of the second current control device CRD2 is relatively low, so that the voltage is shared less, the heat generation is less, and the temperature is lower. Specifically, the thermal balance method of the constant current driving system comprises the following steps:
in the initial stage, when the operating environment temperature of each current control device is less than the first set temperature T1, the system operates normally, even if the temperature difference between the first current control device CRD1 and the second current control device CRD2 is large, both of them operate normally. At this time, the first current control device CRD1 is output with constant current with constant output current capability, the large output current capability of the second current control device CRD2 is greater than the output current capability of the first current control device CRD1, the power switch tube in the second current control device CRD2 is fully opened, the current flowing through the second current control device CRD2 is equal to the current flowing through the first current control device CRD1, and the system is in a safe working state.
As the input voltage increases, the respective current control devices gradually increase in temperature.
When the temperature of the first current control device CRD1 first exceeds the first set temperature T1, the output current capability of the first current control device CRD1 gradually increases with the temperature increase. Until the current output capability of the first current control device CRD1 is increased to be greater than the current output capability of the second current control device CRD2, the impedance of the first current control device CRD1 is less than the impedance of the second current control device CRD2, and the second current control device CRD2 begins to assume more voltage. This causes the second current control device CRD2 to generate more heat, the temperature of the second current control device CRD2 to increase, and the voltage carried by the first current control device CRD1 to decrease, thereby reducing the heat generation and preventing the temperature from increasing.
When the working environment temperature of the second current control device CRD2 exceeds the first set temperature T1, the output current capability of the second current control device CRD2 gradually increases with the increase of the working environment temperature. After the output current capability of the second current control device CRD2 is increased to be greater than the output current capability of the first current control device CRD1, the impedance of the second current control device CRD2 is smaller than the impedance of the first current control device CRD1, the first current control device CRD1 starts to bear more voltage, and the temperature of the first current control device CRD1 is increased. The first current control device CRD1 and the second current control device CRD2 reciprocate in the interval from T1 to T2, heat is alternately increased, and heat is distributed until an equilibrium point is reached. At this time, the working environment temperatures of the first current control device CRD1 and the second current control device CRD2 are equal, the system is in a thermal equilibrium state, and the actual output currents of the first current control device CRD1 and the second current control device CRD2 are consistent.
It should be noted that the system works normally in a safe working state and a thermal equilibrium state.
When the working environment temperature of any one of the first current control device CRD1 and the second current control device CRD2 is higher than the second set temperature T2, the system temperature reaches the highest value, which may affect the normal operation of the system. At this time, the output current capability of the current control device with the working environment temperature being greater than the second set temperature T2 is gradually reduced along with the increase of the working environment temperature, the internal impedance thereof is increased, thereby sharing more voltage, generating more heat, and the temperature is higher until the output current capability is reduced to a balance value, and the temperature is not increased any more. At this time, the other current control device bears the minimum voltage and does not generate heat any more, and the system is in a thermal protection state.
The temperature curve of the output current capability of the current control device has a process of ascending first and then descending, in a series structure, the ascending of the temperature curve can ensure the heat balance of a plurality of diodes, the plurality of diodes are uniformly heated, and the temperature of a system is reduced; the temperature curve is reduced to realize overheat protection.
The constant current driving system and the thermal balance method ensure the consistency of output current by the series structure in the thermal balance interval of T1-T2, thereby reducing the PCB wiring requirement, avoiding the need of paying attention to the matching of wiring impedance during parallel connection, and ensuring that chips can be far away.
In summary, the present invention provides a current control device, a working method, a constant current driving system and a thermal balance method, including:
when the working environment temperature of the current control device is within a first set temperature, the output current capability of the current control device is constant; when the working environment temperature of the current control device is between a first set temperature and a second set temperature, the output current capability of the current control device is gradually increased along with the increase of the working environment temperature; when the working environment temperature of the current control device is between a second set temperature and a third set temperature, the output current capability of the current control device is gradually reduced along with the increase of the working environment temperature. The invention realizes constant current drive by adopting a series connection mode of the current control devices, and can balance the heating on the system when different current control devices are connected in series by controlling the relation curve of the current output capability and the temperature of each current control device, thereby reducing the system temperature and further solving the problem of system reliability caused by the heating of the current control devices. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (9)
1. A constant current driving system, characterized in that the constant current driving system at least comprises:
the voltage input module is connected with a load at the output end of the voltage input module, and the constant current control module is connected with the load in series; the constant current control module comprises at least two current control devices connected in series;
when the working environment temperature of the current control device is within a first set temperature, the output current capacity of the current control device is constant;
when the working environment temperature of the current control device is between a first set temperature and a second set temperature, the output current capacity of the current control device is gradually increased along with the increase of the working environment temperature so as to realize the heat balance of a plurality of current control devices;
when the working environment temperature of the current control device is between the second set temperature and a third set temperature, the output current capacity of the current control device is gradually reduced along with the increase of the working environment temperature so as to realize thermal protection of each current control device;
wherein the first set temperature, the second set temperature, and the third set temperature are sequentially increased.
2. The constant current drive system according to claim 1, wherein: between the first set temperature and the second set temperature, the current control device linearly increases the output current capacity, and the maximum output current capacity is Io (1+ x%); where Io is the constant output current capability and x% is the offset set point.
3. The constant current drive system according to claim 1, wherein: between the second set temperature and the third set temperature, the output current capability of the current control device is linearly reduced, and the minimum output current capability is 0.
4. The constant current drive system according to any one of claims 1 to 3, wherein: the current control device includes at least:
the device comprises a power switch tube, a sampling unit, a temperature detection unit, a reference control unit and a comparison unit;
the temperature detection unit is used for detecting the temperature of a working environment;
the reference control unit is connected with the output end of the temperature detection unit and generates a corresponding reference signal based on the detected working environment temperature;
the sampling unit is connected with the output end of the power switch tube and is used for detecting the output current of the power switch tube;
the comparison unit is connected with the output ends of the reference control unit and the sampling unit and is used for comparing the reference signal with the output signal of the sampling unit to generate a corresponding control signal;
and the grid electrode of the power switch tube is connected with the output end of the comparison unit, and the current flowing through the power switch tube is adjusted based on the control signal.
5. The constant current drive system according to claim 1, wherein: the load comprises a string of LED lights.
6. A thermal balance method of a constant current driving system according to any one of claims 1 to 5, wherein the thermal balance method comprises at least:
when the working environment temperature of the first current control device exceeds a first set temperature, the output current capacity of the first current control device is gradually increased along with the increase of the working environment temperature; until the output current capability of the first current control device is larger than that of the second current control device, the temperature of the first current control device is not increased any more, and the temperature of the second current control device is increased;
when the working environment temperature of the second current control device exceeds the first set temperature, the output current capability of the second current control device is gradually increased along with the increase of the working environment temperature; until the output current capability of the second current control device is larger than that of the first current control device, the temperature of the second current control device is not increased any more, and the temperature of the first current control device is increased;
the first set temperature and the second set temperature are a thermal balance interval of the system, in the interval, the first current control device and the second current control device are heated up alternately to share heat until reaching a balance point, and at the moment, the working environment temperatures of the first current control device and the second current control device are equal;
wherein the constant output current capability of the first current control device is less than the constant output current capability of the second current control device, and the first set temperature is less than the second set temperature.
7. The heat balancing method of claim 6, wherein: the temperature below the first set temperature is a safe working temperature interval of the system, in the interval, each current control device works with constant output current capability, and each current control device works with constant current of the constant output current capability of the first current control device.
8. The heat balancing method according to claim 6 or 7, wherein: and below the second set temperature, the system works normally.
9. The heat balancing method of claim 8, wherein: the second set temperature to the third set temperature are thermal protection intervals of the system, in the interval, the output current capacity of the current control device with the working environment temperature higher than the second set temperature is gradually reduced along with the increase of the working environment temperature, and other current control devices do not heat any more; wherein the third set temperature is greater than the second set temperature.
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| CN205754944U (en) * | 2016-05-11 | 2016-11-30 | 陕西亚成微电子股份有限公司 | A kind of both-end constant-current LED driving chip |
| CN106851906A (en) * | 2017-02-07 | 2017-06-13 | 贵州大学 | A kind of piecewise linearity constant current LED drive circuit |
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| CN108495416A (en) * | 2018-04-19 | 2018-09-04 | 中山市欧帝尔电器照明有限公司 | LED constant current driving temperature protects chip and LED light |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US9565734B1 (en) * | 2014-02-25 | 2017-02-07 | Lumenetix, Inc. | System and method for rapidly generating color models for LED-based lamps |
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| CN205754944U (en) * | 2016-05-11 | 2016-11-30 | 陕西亚成微电子股份有限公司 | A kind of both-end constant-current LED driving chip |
| CN107660013A (en) * | 2016-07-26 | 2018-02-02 | 上海莱托思电子科技有限公司 | A kind of LED both ends constant-current driven chip and constant current driving method |
| CN106851906A (en) * | 2017-02-07 | 2017-06-13 | 贵州大学 | A kind of piecewise linearity constant current LED drive circuit |
| CN108495416A (en) * | 2018-04-19 | 2018-09-04 | 中山市欧帝尔电器照明有限公司 | LED constant current driving temperature protects chip and LED light |
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