CN111885783B - Power supply device and lighting system - Google Patents
Power supply device and lighting system Download PDFInfo
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- CN111885783B CN111885783B CN202010754257.1A CN202010754257A CN111885783B CN 111885783 B CN111885783 B CN 111885783B CN 202010754257 A CN202010754257 A CN 202010754257A CN 111885783 B CN111885783 B CN 111885783B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/345—Current stabilisation; Maintaining constant current
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The application discloses a power supply device and an illumination system, wherein the power supply device comprises a control chip, a booster circuit, a temperature measuring circuit and an adjusting circuit, wherein the control chip is used for receiving a power supply signal and generating a pulse width modulation signal; the boost circuit is connected with the control chip and used for boosting the power supply signal according to the pulse width modulation signal to obtain a power supply signal and inputting the power supply signal to external equipment; the temperature measuring circuit is connected with the control chip and is used for measuring the temperature of external equipment; the adjusting circuit is connected with the control chip and the temperature measuring circuit and used for stopping inputting the adjusting signal to the control chip when the temperature of the external equipment exceeds a preset temperature threshold; the control chip is further used for adjusting the duty ratio of the output pulse width modulation signal when the temperature of the external equipment exceeds a preset temperature threshold value, so that the current of the power supply signal is within a preset current range. Through the mode, the output voltage can be improved, and over-temperature protection can be realized.
Description
Technical Field
The application relates to the technical field of integrated circuits, in particular to a power supply device and an illumination system.
Background
The train headlamp generally requires a relatively long irradiation distance, the conventional Light source adopts an ultrahigh pressure spherical xenon mercury lamp, the power is relatively high, however, with the development of the Light Emitting Diode (LED) technology, the train headlamp also gradually adopts an LED Light source, but due to the heat collection property of the LED Light source, the temperature of the Light source is relatively high, and the service life is affected.
Disclosure of Invention
The application provides a power supply unit and lighting system, can promote output voltage to can realize the excess temperature protection.
In order to solve the above technical problem, the present application adopts a technical scheme that a power supply apparatus is provided, where the power supply apparatus includes a control chip, a voltage boost circuit, a temperature measurement circuit, and an adjustment circuit, where the control chip is configured to receive a power supply signal and generate a pulse width modulation signal; the boost circuit is connected with the control chip and used for boosting the power supply signal according to the pulse width modulation signal to obtain a power supply signal and inputting the power supply signal to external equipment; the temperature measuring circuit is connected with the control chip and used for measuring the temperature of external equipment; the adjusting circuit is connected with the control chip and the temperature measuring circuit and used for stopping inputting the adjusting signal to the control chip when the temperature of the external equipment exceeds a preset temperature threshold; the control chip is further used for adjusting the duty ratio of the output pulse width modulation signal when the temperature of the external device exceeds a preset temperature threshold value, so that the current of the power supply signal is within a preset current range.
In order to solve the above technical problem, another technical solution adopted in the present application is to provide an illumination system, which includes a power supply device and a light emitting module that are connected to each other, wherein the power supply device is configured to receive a power supply signal and output the power supply signal to the light emitting module according to the power supply signal, so that the light emitting module emits light, and the power supply device is the above power supply device.
Through the scheme, the beneficial effects of the application are that: the power supply device comprises a control chip, a booster circuit, a temperature measuring circuit and an adjusting circuit, wherein the booster circuit can be used for boosting an input power supply signal to obtain a power supply signal, and the power supply signal is input to external equipment, so that the external equipment can work, and high-power supply is realized; in addition, the temperature measuring circuit can measure the temperature of the external equipment, the adjusting circuit can determine whether to input an adjusting signal to the control chip according to the temperature of the external equipment, when the adjusting circuit does not output the adjusting signal, the duty ratio of the output pulse width modulation signal can be adjusted by the control chip, the pulse width modulation signal is input to the booster circuit, so that the current value of the power supply signal output by the booster circuit can be adjusted, the temperature measuring circuit, the adjusting circuit, the control chip and the booster circuit can be utilized, when the temperature of the external equipment is overhigh, the current of the output power supply signal is adjusted in time, the current input to the external equipment is reduced, the heating condition of the external equipment is relieved, the situation that the external equipment generates heat seriously due to long-term work in a high-power mode can be avoided, and the service life of the external equipment is prolonged.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. Wherein:
fig. 1 is a schematic structural diagram of an embodiment of a power supply apparatus provided in the present application;
FIG. 2 is a schematic structural diagram of another embodiment of a power supply apparatus provided in the present application;
FIG. 3 is a schematic diagram of the structure of the filter circuit in the embodiment shown in FIG. 2;
fig. 4 is a schematic structural diagram of an embodiment of an illumination system provided in the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a power supply device provided in the present application, and the power supply device 10 includes: control chip 11, boost circuit 12, temperature measurement circuit 13 and adjusting circuit 14.
The control chip 11 is configured to receive a power supply signal and generate a Pulse Width Modulation (PWM) signal; specifically, the duty ratio of the pwm signal may be dynamically adjusted according to the outputs of the temperature measuring circuit 13 and the adjusting circuit 14, the power supply signal may be a dc signal, the voltage value of the power supply signal may be 8-16V, and the current value may be greater than 5A.
The boost circuit 12 is connected to the control chip 11, and is configured to receive the power supply signal and the pulse width modulation signal, perform boost processing on the power supply signal according to the pulse width modulation signal to obtain a power supply signal, and input the power supply signal to the external device 20, so as to provide the external device 20 with required power; specifically, the voltage value of the power supply signal may be 36.5V, the current value of the power supply signal may be 1.52A, the power of the power supply signal is 55W, the ripple of the power supply signal may be 50mVpp, the frequency of the power supply signal may be 300KHZ, and the external device 20 may be an LED or a mercury xenon lamp or other devices requiring power supply.
The temperature measuring circuit 13 is connected with the control chip 11 and is used for measuring the temperature of the external equipment 20; specifically, the temperature measuring circuit 13 may be connected to the external device 20, or the temperature measuring circuit 13 may be attached to the external device 20, so that the temperature information of the external device 20 can be acquired in real time.
The adjusting circuit 14 is connected to the control chip 11 and the temperature measuring circuit 13, and is configured to stop inputting the adjusting signal to the control chip 11 when the temperature of the external device 20 exceeds a preset temperature threshold.
Further, the control chip 11 is further configured to adjust a duty ratio of the output pulse width modulation signal when the temperature of the external device 20 exceeds a preset temperature threshold, so that the current of the power supply signal is within a preset current range; specifically, the preset temperature threshold may be a value preset empirically, for example, 85 ℃, when the temperature of the external device 20 exceeds 85 ℃, the adjusting circuit 14 does not output a signal, at this time, the control chip 11 obtains information that the current temperature of the external device 20 is too high, and in order to reduce the temperature of the external device 20, the control chip 11 may adjust a duty ratio of the output pulse width modulation signal, so as to reduce the current of the output power signal; for example, taking the external device 20 as an LED as an example, when the current input to the LED is reduced, the light emitting luminance of the LED is reduced, and the LED can operate at low luminance, thereby avoiding a high-temperature operation mode for a long time, and contributing to prolonging the service life of the LED.
The present embodiment provides a power supply apparatus 10, which performs a boosting process on an input power supply signal by using a boosting circuit 12, can generate a power supply signal required by an external device 20, and inputs the power supply signal to the external device 20, so that the external device 20 can operate, and high-power supply is realized; in addition, the temperature measuring circuit 13 can be used to measure the temperature of the external device 20, the adjusting circuit 14 can determine whether to input an adjusting signal to the control chip 11 according to the temperature of the external device 20, when the adjusting circuit 14 does not output, the control chip 11 can adjust the duty ratio of the output pulse width modulation signal, so that the current value of the power supply signal output by the boosting circuit 12 is reduced, and through the cooperation of the control chip 11, the boosting circuit 12, the temperature measuring circuit 13 and the adjusting circuit 14, when the temperature of the external device 20 is too high, the current of the output power supply signal can be adjusted in time, so that the current input to the external device 20 is reduced, the heating condition of the external device 20 is relieved, the serious heating of the external device 20 caused by long-term operation in a high-power mode is avoided, and the service life of the external device 20 is prolonged.
Referring to fig. 2, fig. 2 is a schematic structural diagram of another embodiment of a power supply apparatus provided in the present application, the power supply apparatus includes: the temperature measuring circuit comprises a control chip 11, a booster circuit 12, a temperature measuring circuit 13, an adjusting circuit 14, a protection circuit 15 and a filter circuit 16.
The protection circuit 15 is connected to the control chip 11 and the booster circuit 12, and is configured to close the path between the power supply signal and the control chip 11 and close the path between the power supply signal and the booster circuit 12 when the power supply signal is reversely connected, that is, when the negative pole of the power supply signal is connected to the control chip 11.
In a specific embodiment, as shown in fig. 2, the protection circuit 15 includes: the power supply circuit comprises a seventh resistor R7, a third switching tube Q3 and an eighth resistor R8, wherein one end of the seventh resistor R7 is connected with the positive electrode of a power supply signal; a first end of a third switching tube Q3 is connected with the other end of the seventh resistor R7, a second end of the third switching tube Q3 is connected with the negative electrode of the power supply signal, and a third end of the third switching tube Q3 is grounded; specifically, the third switch tube Q3 may be an N-type Metal Oxide Semiconductor (NMOS) tube, and the first end, the second end, and the third end of the third switch tube Q3 are a gate, a drain, and a source, respectively; one end of the eighth resistor R8 is connected to the other end of the seventh resistor R7, and the other end of the eighth resistor R8 is grounded.
Further, when the power supply signal is reversely connected, the first end of the third switching tube Q3 is at a low level, and at this time, the third switching tube Q3 is in a cut-off state, and the power supply signal cannot be input into the control chip 11 and the boost circuit 12, so that reverse connection prevention of input is realized, and the whole circuit can be protected from being damaged due to reverse connection.
The filter circuit 16 is connected to the protection circuit 15, and is configured to filter an input power supply signal when the protection circuit 15 is turned on, and input the filtered power supply signal to the sixth pin VIN of the control chip 11 and the voltage boost circuit 12.
In a specific embodiment, as shown in fig. 3, the filter circuit 16 includes fifth to eighth capacitors C5 to C8 and a ninth resistor R9, the fifth to seventh capacitors C5 to C7 may be large-capacity ceramic capacitors, the eighth capacitor C8 may be a solid capacitor, and the filter circuit 16 has a low Equivalent Series Resistance (ESR) and is capable of providing a large transient current for a subsequent stage.
The control chip 11 is used for receiving a power supply signal and generating a pulse width modulation signal; as shown in fig. 2, the control chip 11 may be an integrated chip having 20 pins, a first pin VS of the control chip 11 is connected to the temperature measuring circuit 13 through a tenth resistor R10, a second pin CSH is connected to one end of an eleventh resistor R11 and an output end of the adjusting circuit 14, and another end of the eleventh resistor R11 is grounded; the third pin GATE is connected to the boost circuit 12 and is configured to output a pulse width modulation signal; the fourth pin HSP is connected to the boost circuit 12 through a twelfth resistor R12, the fifth pin HSN is connected to the boost circuit 12 through a thirteenth resistor R13, and the twelfth resistor R12 is connected to the thirteenth resistor R13 through a ninth capacitor C9.
A sixth pin VIN is a signal input end and used for receiving a power supply signal, the sixth pin VIN receives the power supply signal through a fourteenth resistor R14, one end of the fourteenth resistor R14 is connected with a positive electrode of the power supply signal, the other end of the fourteenth resistor R14 is grounded through a tenth capacitor C10, and the tenth capacitor C10 is an input capacitor of the chip and can be used for filtering out high-frequency noise in the power supply signal; the seventh pin EN is an enable terminal, the seventh pin EN is connected with the sixth pin VIN, and when the seventh pin EN is at a high level, the control chip 11 enters a working state; the eighth pin COMP is grounded through an eleventh capacitor C11; the ninth pin RT is grounded through a fifteenth resistor R15; the tenth pin nDIM is connected to the positive electrode of the power supply signal through a sixteenth resistor R16, and the tenth pin nDIM is grounded through a seventeenth resistor R17.
The eleventh pin SS is grounded through a twelfth capacitor C12; the twelfth pin TGAIN is grounded through an eighteenth resistor R18; the thirteenth pin TENSE is grounded through a thirteenth capacitor C13, specifically, one end of the thirteenth capacitor C13 is connected to the thirteenth pin TENSE and one end of a nineteenth resistor R19, and the other end of the nineteenth resistor R19 is connected to the temperature measuring circuit 13; the fourteenth pin TREF is connected to one end of a twentieth resistor R20, one end of a twenty-first resistor R21 and one end of a fourteenth capacitor C14, the other end of the twentieth resistor R20 and the other end of the fourteenth capacitor C14 are both grounded, and the other end of the twenty-first resistor R21 is connected to the adjusting circuit 14; the fifteenth pin OVP is connected to one end of the twenty-second resistor R22, one end of the twenty-third resistor R23 and one end of the fifteenth capacitor C15, the other end of the twenty-second resistor R22 is connected to the ninth capacitor C9, and the other ends of the twenty-third resistor R23 and the fifteenth capacitor C15 are grounded; a sixteenth pin DDRV is suspended; a seventeenth pin GND is a ground terminal; the eighteenth pin VCC is grounded through a sixteenth capacitor C16; the nineteenth pin IS connected to the booster circuit 12; the twentieth pin SLOPE is grounded through a twenty-fourth resistor R24.
The boost circuit 12 is connected to the control chip 11, and is configured to boost the power supply signal according to the pulse width modulation signal to obtain a power supply signal, and input the power supply signal to the external device 20.
In a specific embodiment, as shown in fig. 2, the voltage boost circuit 12 includes a first inductor L1, a second inductor L2, a diode D, a second switch Q2, a sixth resistor R6, and a fourth capacitor C4, wherein one end of the first inductor L1 is used for receiving a power supply signal; one end of the diode D is connected to the other end of the first inductor L1, and the diode D may be a schottky diode; a first end of the second switching tube Q2 is connected to a third pin GATE of the control chip 11, and a second end of the second switching tube Q2 is connected to one end of the diode D; one end of a sixth resistor R6 is connected with the third end of the second switch tube Q2, and the other end of the sixth resistor R6 is grounded; one end of a fourth capacitor C4 is connected with the other end of the diode D, and the other end of the fourth capacitor C4 is grounded; specifically, the second switch tube Q2 may be an NMOS tube, the first end, the second end, and the third end of the second switch tube Q2 are a gate, a drain, and a source, respectively, and the fourth capacitor C4 may be a single capacitor or a plurality of capacitors connected in parallel; one end of the second inductor L2 is connected to the control chip 11, and the other end of the second inductor L2 is connected to the external device 20.
Further, the first inductor L1 and the second inductor L2 are energy conversion devices for converting electric energy and magnetic energy into each other, when the pulse width modulation signal is at a high level, the second switching tube Q2 is closed, and the first inductor L1 and the second inductor L2 can convert the electric energy into magnetic field energy to be stored; when the second switch Q2 is turned off, the first inductor L1 converts the stored magnetic field energy into electric energy, and the energy is superposed with the input power supply signal and filtered by the diode D and the fourth capacitor C4 to obtain a smooth dc voltage, which is provided to the external device 20.
With reference to fig. 2, the power supply device further includes a current detection resistor R, the fourth pin HSP of the control chip 11 is connected to one end of the current detection resistor R, and the fifth pin HSN of the control chip 11 is connected to the other end of the current detection resistor R.
In a specific embodiment, the control chip 11 is configured to detect whether a current value flowing through the current detection resistor R is a preset current value, and adjust a duty ratio of the output pulse modulation signal when the current value flowing through the current detection resistor R is not the preset current value, so that the current value flowing through the current detection resistor R is the preset current value.
Further, the control chip 11 includes a detection amplifier (not shown in the figure), a non-inverting input terminal of the detection amplifier is connected to the fifth pin HSN of the control chip 11, and an inverting input terminal of the detection amplifier is connected to the fourth pin HSP of the control chip 11, and the third pin GATE of the control chip 11 can output a corresponding pulse width modulation signal through the detection amplifier, so as to control the second switching tube Q2 to be turned on or off, thereby implementing a constant current output function.
In another specific embodiment, the control chip 11 is configured to detect whether the voltage values at two sides of the current detection resistor R are the preset voltage values, and adjust the duty ratio of the output pulse modulation signal when the voltage values at two sides of the current detection resistor R are not the preset voltage values, so that the voltage values at two sides of the current detection resistor R are the preset voltage values.
Further, the twenty-second resistor R22 and the twenty-third resistor R23 are feedback resistors, and provide a voltage to the fifteenth pin OVP of the control chip 11 through voltage division, so that the third pin GATE of the control chip 11 outputs a corresponding pulse width modulation signal to the second switching tube Q2 to control the second switching tube Q2 to be turned on or off, thereby outputting a constant voltage.
The temperature measuring circuit 13 is connected with the control chip 11 and is used for measuring the temperature of the external equipment 20; specifically, the Temperature measuring circuit 13 includes a Negative Temperature Coefficient (NTC) thermistor (not shown in the drawings) attached to the external device 20.
The adjusting circuit 14 is connected with the control chip 11 and the temperature measuring circuit 13, and the adjusting circuit 14 includes: a comparator circuit 141 and a switch circuit 142.
The comparison circuit 141 is connected to the first pin VS of the control chip 11, and is configured to receive the first voltage signal and the second voltage signal, and output a corresponding comparison signal according to a magnitude relationship between a voltage value of the first voltage signal and a voltage value of the second voltage signal; specifically, the first voltage signal is a voltage at one end of the tenth resistor R10, and the second voltage signal is a voltage at the other end of the tenth resistor R10. The switch circuit 142 is connected to the comparison circuit 141 and the second pin CSH of the control chip 11, and is configured to receive the comparison signal, and turn on or off a path between the comparison circuit 141 and the control chip 11 according to a voltage value of the comparison signal.
Further, when the temperature of the external device 20 exceeds the preset temperature threshold, the comparison circuit 141 outputs a low-level comparison signal, the switch circuit 142 closes a path between the comparison circuit 141 and the control chip 11, and the duty ratio of the pulse modulation signal output by the control chip 11 is reduced to the preset duty ratio.
In a specific embodiment, as shown in fig. 2, the comparison circuit 141 includes: a first resistor R1 to a fourth resistor R4, a first capacitor C1 to a third capacitor C3 and a comparator A.
One end of the first resistor R1 is connected to a first pin VS of the control chip 11; one end of the second resistor R2 is connected with the temperature measuring circuit 13; the non-inverting input end of the comparator A is connected with the other end of the first resistor R1, the inverting input end of the comparator A is connected with the other end of the second resistor R2, the power supply end of the comparator A is connected with the first pin VS of the control chip 11, and the grounding end of the comparator A is grounded; one end of a third resistor R3 is connected with the non-inverting input end of the comparator A, and the other end of the third resistor R3 is grounded; one end of the first capacitor C1 is connected with the inverting input end of the comparator A, and the other end of the first capacitor C1 is grounded; one end of the second capacitor C2 is connected with the non-inverting input end of the comparator A, and the other end of the second capacitor C2 is grounded; one end of a fourth resistor R4 is connected with a first pin VS of the control chip 11, and the other end of the fourth resistor R4 is connected with the output end of the comparator A; one end of the third capacitor C3 is connected to the output end of the comparator a, and the other end of the third capacitor C3 is grounded.
The switch circuit 142 includes a first switch tube Q1 and a fifth resistor R5, a first end of the first switch tube Q1 is connected to the output end of the comparison circuit 141, a second end of the first switch tube Q1 is connected to the second pin CSH of the control chip 11, and a third end of the first switch tube Q1 is grounded; one end of a fifth resistor R5 is connected with the third end of the first switching tube Q1, and the other end of the fifth resistor R5 is connected with a second pin CSH of the control chip 11; specifically, the first switch tube Q1 is an NMOS tube, and the first end, the second end, and the third end of the first switch tube Q1 are a gate, a source, and a drain, respectively.
The control chip 11 further includes a comparison amplifier (not shown in the figure), a non-inverting input terminal of the comparison amplifier is connected to the fourteenth pin TREF of the control chip 11, and an inverting input terminal of the comparison amplifier is connected to the thirteenth pin tens of the control chip 11, so as to implement the thermal energy reverse control; for example, the external device 20 is an LED, the NTC thermistor can take a signal on a copper substrate of the LED, when the temperature of the LED reaches 85 ℃, the pwm signal controls the second switch Q2 to be turned on or off, the current flowing into the LED can be linearly reduced, the higher the temperature, the lower the current flowing into the LED, and finally a balance value is reached, and the process can be regarded as analog dimming.
If the temperature of the external device 20 does not reach the preset temperature threshold value, the resistance value of the NTC thermistor is greater than the preset resistance value, at this time, the comparator a outputs a high-level adjustment signal, the first switching tube Q1 is turned on, the fifth resistor is grounded, and the fifth resistor R5 is connected in parallel with the eleventh resistor R11; if the temperature of the external device 20 exceeds the preset temperature threshold, and the NTC thermistor is damaged or is open-circuited, after sampling detection by the comparator a, the gate voltage of the first switching tube Q1 is pulled down, so that the first switching tube Q1 is turned off, and the resistance value of the ground resistor of the second pin CSH is increased, so that the duty ratio of the output pulse width modulation signal is reduced, and thus the current input to the external device 20 is reduced, and the external device 20 is protected.
The internal temperature of the external device 20 may rise to an extremely high level due to the influence of the actual operating environment, and if the temperature of the external device 20 exceeds a preset temperature threshold and enters an unsafe zone, the life and the working efficiency of the external device 20 will be affected; in the embodiment, the boosting circuit 12 can be used to provide a larger power to the external device 20, so as to achieve the boosting effect; meanwhile, the temperature measuring circuit 13 is adopted to monitor the temperature of the external equipment 20 so as to prevent the temperature from being out of control, if an overheat condition occurs, the control chip 11 can reduce the current input to the external equipment 20, over-temperature protection is realized, the service life of the external equipment 20 is prolonged, and the conversion efficiency of the whole device can reach 93%.
Referring to fig. 4, fig. 4 is a schematic structural diagram of an embodiment of an illumination system provided in the present application, the illumination system 40 includes a power supply device 41 and a light emitting element 42 that are connected to each other, the power supply device 41 is configured to receive a power supply signal, and output the power supply signal to the light emitting element 42 according to the power supply signal, so that the light emitting element 42 emits light, and the power supply device 41 is the power supply device in the above embodiment.
The light emitting component 42 may be an LED, and in this embodiment, the control chip 11 may be used to set a temperature and a slope breakpoint for the LED in the lighting system 40, so as to ensure that the LED works in a safe area; when the temperature of the LED is too high, the power supply device 41 may reduce the output current, and the reduced current may cause the brightness of the LED to decrease, but still maintain within the preset brightness range until the temperature of the LED returns to the safe operating range; the heat energy return design can provide reliable guarantee for the service life and the illumination effect of the LED, and ensure that the illumination system 40 can normally operate.
The above description is only an example of the present application, and is not intended to limit the scope of the present application, and all equivalent structures or equivalent processes performed by the present application and the contents of the attached drawings, which are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (9)
1. A power supply device, comprising:
the control chip is used for receiving the power supply signal and generating a pulse width modulation signal;
the boost circuit is connected with the control chip and used for boosting the power supply signal according to the pulse width modulation signal to obtain a power supply signal and inputting the power supply signal to external equipment;
the temperature measuring circuit is connected with the control chip and used for measuring the temperature of the external equipment;
the adjusting circuit is connected with the control chip and the temperature measuring circuit and used for stopping inputting an adjusting signal to the control chip when the temperature of the external equipment exceeds a preset temperature threshold value;
the control chip is further configured to adjust a duty ratio of the output pulse width modulation signal when the temperature of the external device exceeds the preset temperature threshold, so that the current of the power supply signal is within a preset current range;
the adjusting circuit comprises a comparison circuit and a switch circuit, wherein the comparison circuit is connected with a first pin of the control chip and is used for receiving a first voltage signal and a second voltage signal and outputting a corresponding comparison signal according to the magnitude relation between the voltage value of the first voltage signal and the voltage value of the second voltage signal; the switch circuit is connected with the comparison circuit and the second pin of the control chip and used for receiving the comparison signal and switching on or off a path between the comparison circuit and the control chip according to the voltage value of the comparison signal.
2. The power supply device according to claim 1,
when the temperature of the external equipment exceeds the preset temperature threshold, the comparison circuit outputs a low-level comparison signal, the switch circuit closes a passage between the comparison circuit and the control chip, and the duty ratio of the pulse width modulation signal output by the control chip is reduced to a preset duty ratio.
3. The power supply device according to claim 1, wherein the comparison circuit comprises:
one end of the first resistor is connected with a first pin of the control chip;
one end of the second resistor is connected with the temperature measuring circuit;
a non-inverting input terminal of the comparator is connected with the other end of the first resistor, an inverting input terminal of the comparator is connected with the other end of the second resistor, a power supply terminal of the comparator is connected with the first pin of the control chip, and a ground terminal of the comparator is grounded;
one end of the third resistor is connected with the non-inverting input end of the comparator, and the other end of the third resistor is grounded;
one end of the first capacitor is connected with the inverting input end of the comparator, and the other end of the first capacitor is grounded;
one end of the second capacitor is connected with the non-inverting input end of the comparator, and the other end of the second capacitor is grounded;
one end of the fourth resistor is connected with the first pin of the control chip, and the other end of the fourth resistor is connected with the output end of the comparator;
and one end of the third capacitor is connected with the output end of the comparator, and the other end of the third capacitor is grounded.
4. The power supply device according to claim 1, wherein the switching circuit comprises:
a first end of the first switch tube is connected with the output end of the comparison circuit, and a second end of the first switch tube is grounded;
one end of the fifth resistor is connected with the third end of the first switching tube, and the other end of the fifth resistor is connected with the second pin of the control chip.
5. The power supply device according to claim 1, wherein the booster circuit comprises:
one end of the first inductor is used for receiving the power supply signal;
one end of the diode is connected with the other end of the first inductor;
a first end of the second switching tube is connected with a third pin of the control chip, and a second end of the second switching tube is connected with one end of the diode;
one end of the sixth resistor is connected with the third end of the second switch tube, and the other end of the sixth resistor is grounded;
one end of the fourth capacitor is connected with the other end of the diode, and the other end of the fourth capacitor is grounded;
and one end of the second inductor is connected with the control chip, and the other end of the second inductor is connected with the external equipment.
6. The power supply device according to claim 1,
the power supply device further comprises a current detection resistor, a fourth pin of the control chip is connected with one end of the current detection resistor, a fifth pin of the control chip is connected with the other end of the current detection resistor, the control chip is used for detecting whether the current value flowing through the current detection resistor is a preset current value, and when the current value flowing through the current detection resistor is not the preset current value, the duty ratio of the output pulse width modulation signal is adjusted so that the current value flowing through the current detection resistor is the preset current value; or the control chip is used for detecting whether the voltage values on the two sides of the current detection resistor are preset voltage values or not, and when the voltage values on the two sides of the current detection resistor are not the preset voltage values, the duty ratio of the output pulse width modulation signal is adjusted, so that the voltage values on the two sides of the current detection resistor are the preset voltage values.
7. The power supply device according to claim 1, characterized by further comprising:
the protection circuit is connected with the control chip and the booster circuit and is used for closing a path between the power supply signal and the control chip and closing a path between the power supply signal and the booster circuit when the power supply signal is reversely connected;
and the filter circuit is connected with the protection circuit and used for filtering the input power supply signal when the protection circuit is switched on and inputting the filtered power supply signal into the sixth pin of the control chip and the booster circuit.
8. The power supply device according to claim 7, wherein the protection circuit comprises:
one end of the seventh resistor is connected with the anode of the power supply signal;
a first end of the third switching tube is connected with the other end of the seventh resistor, a second end of the third switching tube is connected with the negative electrode of the power supply signal, and a third end of the third switching tube is grounded;
and one end of the eighth resistor is connected with the other end of the seventh resistor, and the other end of the eighth resistor is grounded.
9. An illumination system, comprising a power supply device and a light emitting component connected to each other, wherein the power supply device is configured to receive a power supply signal, and output a power supply signal to the light emitting component according to the power supply signal, so as to enable the light emitting component to emit light, and wherein the power supply device is according to any one of claims 1 to 8.
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| CN200997700Y (en) * | 2007-01-09 | 2007-12-26 | 李江淮 | Large-power driving chip of LED light |
| CN101714750A (en) * | 2009-11-26 | 2010-05-26 | 重庆大学 | LED protecting chip based on PWM shunt |
| CN203608439U (en) * | 2013-12-24 | 2014-05-21 | 淮阴工学院 | LED constant current power supply with over-temperature protection |
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