CN215734938U

CN215734938U - Temperature control circuit and lighting equipment thereof

Info

Publication number: CN215734938U
Application number: CN202121137799.0U
Authority: CN
Inventors: 鲍永
Original assignee: Yuyao Yuchang Electrical Appliance Co Ltd
Current assignee: Yuyao Yuchang Electrical Appliance Co Ltd
Priority date: 2021-05-25
Filing date: 2021-05-25
Publication date: 2022-02-01
Anticipated expiration: 2031-05-25

Abstract

The utility model relates to a temperature control circuit, which is characterized in that: the LED brightness control circuit comprises a temperature detection circuit, a control module and an LED drive circuit, wherein the temperature detection circuit and the LED drive circuit are both connected with the control module, and the control module is used for outputting PWM pulses to the LED drive circuit according to the detection result of the temperature detection circuit, so that the LED brightness is adjusted. Also disclosed is a lighting device comprising the temperature control circuit. Has the advantages that: the control module outputs PWM pulses to the LED drive circuit according to the result of the temperature detection circuit, so that the brightness of the LED is adjusted, the temperature control circuit can adjust the brightness of the LED according to the change of the temperature, the temperature inside the flashlight can be detected at any time when the temperature control circuit is particularly applied to the flashlight, the brightness of the LED is adjusted, the luminous heat of the flashlight is reduced, and the use comfort of a user is improved.

Description

Temperature control circuit and lighting equipment thereof

Technical Field

The utility model relates to the field of temperature control, in particular to a temperature control circuit and lighting equipment thereof.

Background

The flashlight has the advantages that the flashlight generates more heat when being lighted at high brightness, the shell temperature is higher, and a user can scald or feel uncomfortable when holding the flashlight by hands, the conventional flashlight is used for reducing the brightness at regular time to prevent the defect of overhigh shell temperature of the flashlight, but the defect is that the flashlight is not intelligent, namely the flashlight cannot automatically adjust the amplitude of the timed brightness reduction according to the ambient temperature, when the ambient temperature is lower, if the flashlight is still carried out according to the amplitude of the timed brightness reduction, the shell temperature of the flashlight is always lower, but the user can only use the lower brightness for a long time; when the ambient temperature is relatively high, the flashlight housing temperature will also be maintained in a relatively high range, which is still uncomfortable for the user.

SUMMERY OF THE UTILITY MODEL

The first technical problem to be solved by the present invention is to provide a temperature control circuit capable of adjusting the brightness of an LED according to the change of temperature to improve the comfort of a user, in view of the current state of the prior art.

A second technical problem to be solved by the present invention is to provide an illumination apparatus including the temperature control circuit, so as to adjust the temperature of the illumination apparatus by adjusting the brightness of the illumination apparatus according to the temperature control circuit.

The technical scheme adopted by the utility model for solving the first technical problem is as follows: a temperature control circuit, characterized by: the LED brightness control circuit comprises a temperature detection circuit, a control module and an LED drive circuit, wherein the temperature detection circuit and the LED drive circuit are both connected with the control module, and the control module is used for outputting PWM pulses to the LED drive circuit according to the detection result of the temperature detection circuit, so that the LED brightness is adjusted.

Preferably, the temperature detection circuit includes thermistor and eighteenth resistance, thermistor and eighteenth resistance are established ties mutually, first voltage is connected to the other end of eighteenth resistance, thermistor's other end ground connection, correspond between thermistor and the eighteenth resistance and be temperature detection circuit's output. Therefore, the temperature is converted into the resistance value through the thermistor, and the change of the temperature can be sensed through the voltage at the output end of the temperature detection circuit.

Furthermore, the temperature detection circuit further comprises a tenth capacitor, one end of the tenth capacitor is connected between the thermistor and the eighteenth resistor, and the other end of the tenth capacitor is grounded.

The LED driving circuit comprises a driving chip, a first resistor, a second resistor, a third resistor, a fifth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first diode, a second diode, a first inductor, a third light emitting diode and a first MOS (metal oxide semiconductor) tube;

the fifth resistor and the fourth capacitor are connected in series, a connecting end between the fifth resistor and the fourth capacitor is connected with a pin 4 of the driving chip, the other end of the fifth resistor is connected with a first voltage, and the other end of the fourth capacitor is grounded; one end of the first capacitor is connected with a 5 th pin of the driving chip, and the other end of the first capacitor is grounded; one end of the second resistor is connected with a No. 3 pin of the driving chip, an input end of the LED driving circuit is correspondingly arranged between the second resistor and the No. 3 pin of the driving chip, and the other end of the second resistor is grounded; the 2 nd pin of the driving chip is grounded; a 6 th pin of the driving chip is respectively connected with a third resistor, a first resistor and a source electrode of the first MOS tube, and the other ends of the third resistor and the first resistor are grounded; the No. 1 pin of the driving chip is connected with the grid electrode of the first MOS tube; the drain electrode of the first MOS tube is connected with the anode of the first diode, the anode of the second diode and the cathode of the third light-emitting diode, the anode of the third light-emitting diode is connected with one end of a first inductor, the other end of the first inductor is connected with the cathode of the first diode, the cathode of the second diode, a second capacitor and a third capacitor, the other ends of the second capacitor and the third capacitor are grounded, and a second voltage is connected between the first inductor and the second capacitor.

The technical scheme adopted by the utility model for solving the second technical problem is as follows: an illumination device, characterized by: including a temperature control circuit as described above.

In order to realize the control of the LED, the LED lamp also comprises a switch circuit, wherein the switch circuit comprises a key, one end of the key is connected with the control module, and the other end of the key is grounded.

The negative electrode of the battery is grounded, the positive electrode of the battery is connected with the input end of the voltage stabilizing module and one end of the twelfth capacitor, the other end of the twelfth capacitor is grounded, a second voltage is correspondingly output between the positive electrode of the battery and the input end of the voltage stabilizing module, the grounding end of the voltage stabilizing module is grounded, the output end of the voltage stabilizing module outputs the first voltage, the output end of the voltage stabilizing module is further connected with one end of the ninth capacitor, and the other end of the ninth capacitor is grounded.

In order to realize the electric quantity monitoring of the battery, the battery also comprises an electric quantity indicating module, wherein the electric quantity indicating module comprises an electric quantity detecting circuit and an indicating circuit, the electric quantity detecting circuit and the indicating circuit are both connected with the control module, and the control module controls the indicating circuit according to the detection result of the electric quantity detecting circuit.

Preferably, the electric quantity detection circuit includes twenty-fourth resistance, twenty-fifth resistance and eleventh electric capacity, twenty-fourth resistance and twenty-fifth resistance are established ties just the second voltage is connected to the other end of twenty-fourth resistance, the other end ground connection of twenty-fifth resistance, the one end of eleventh electric capacity is connected between twenty-fourth resistance and the twenty-fifth resistance and is corresponded electric quantity detection circuit's output, electric quantity detection circuit's output is connected with control module, the other end ground connection of eleventh electric capacity.

Preferably, the indicating circuit includes a twentieth resistor, a first light emitting diode and a second light emitting diode, the first light emitting diode and the second light emitting diode are connected in parallel and are connected in series with the twentieth resistor, the other end of the twentieth resistor is connected to a first voltage, and cathodes of the first light emitting diode and the second light emitting diode are respectively connected to the control module. The first light emitting diode and the second light emitting diode can be different colors, namely, the colors can be more obvious through indication.

Compared with the prior art, the utility model has the advantages that: detect the temperature through temperature detection circuit, control module gives LED drive circuit with output PWM pulse according to temperature detection circuit's result, thereby realize the adjustment to LED luminance, consequently above-mentioned temperature control circuit can be according to the luminance of the change adjustment LED of temperature, when being applied to the flashlight in particular, can detect the inside temperature of flashlight at any time, readjust LED's luminance, reduce the luminous heat of flashlight, thereby reduce the temperature of flashlight shell, make flashlight shell temperature maintain at stable within range, improve the comfort that the user used, the user can be in the comfortable within range of sensation handheld use for a long time.

Drawings

FIG. 1 is a schematic block diagram of a lighting device in an embodiment of the present invention;

fig. 2 is a detailed circuit diagram of fig. 1.

Detailed Description

The utility model is described in further detail below with reference to the accompanying examples.

The temperature control circuit in this embodiment includes temperature detection circuit 1, control module 2 and LED drive circuit 3, and temperature detection circuit 1 and LED drive circuit 3 are all connected with control module 2, and control module 2 is used for outputting PWM pulse to LED drive circuit 3 according to the testing result of temperature detection circuit 1 to the realization is to the adjustment of LED luminance.

In this embodiment, the temperature detecting circuit 1 includes a thermistor R19 and an eighteenth resistor 18, the thermistor R19 and the eighteenth resistor 18 are connected in series, the other end of the eighteenth resistor 18 is connected to the first voltage VCC, the other end of the thermistor R19 is grounded, and an output terminal TEMP of the temperature detecting circuit 1 is correspondingly arranged between the thermistor R19 and the eighteenth resistor 18. The thermistor R19 is a common NTC, and the resistance value of the thermistor R19 decreases with the increase of the temperature; the temperature detection circuit 1 is substantially a voltage divider circuit, and the output terminal thereof outputs a voltage divided by the resistance of the thermistor R19, that is, the temperature can be digitized by the voltage, the eighteenth resistor 18 may be a plurality of resistors connected in series to the thermistor R19, and the number of resistors is not particularly limited. In addition, in order to filter the voltage division circuit, the temperature detection circuit 1 further includes a tenth capacitor C10, one end of the tenth capacitor C10 is connected between the thermistor R19 and the eighteenth resistor 18, and the other end of the tenth capacitor C10 is grounded.

The LED driving circuit 3 includes a driving chip U1, a first resistor R1, a second resistor R2, a third resistor R3, a fifth resistor R5, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first diode D1, a second diode D2, a first inductor L1, a third light emitting diode LED3, and a first MOS tube Q1; the fifth resistor R5 and the fourth capacitor C4 are connected in series, the connection end between the fifth resistor R5 and the fourth capacitor C4 is connected with the 4 th pin of the driving chip U1, the other end of the fifth resistor R5 is connected with the first voltage VCC, and the other end of the fourth capacitor C4 is grounded; one end of the first capacitor C1 is connected with the 5 th pin of the driving chip U1, and the other end of the first capacitor C1 is grounded; one end of the second resistor R2 is connected to the 3 rd pin of the driving chip U1, the input end PWM of the LED driving circuit 3 is correspondingly connected between the second resistor R2 and the 3 rd pin of the driving chip U1, and the other end of the second resistor R2 is grounded; the 2 nd pin of the driving chip U1 is grounded; a 6 th pin of the driving chip U1 is respectively connected with the sources of the third resistor R3, the first resistor R1 and the first MOS transistor Q1, and the other ends of the third resistor R3 and the first resistor R1 are grounded; the 1 st pin of the driving chip U1 is connected with the gate of the first MOS transistor Q1; the drain of the first MOS transistor Q1 is connected to the anode of the first diode D1, the anode of the second diode D2, and the cathode of the third light emitting diode LED3, the anode of the third light emitting diode LED3 is connected to one end of the first inductor L1, the other end of the first inductor L1 is connected to the cathode of the first diode D1, the cathode of the second diode D2, the second capacitor C2, and the third capacitor C3, the other ends of the second capacitor C2 and the third capacitor C3 are grounded, and the second voltage VDD is connected between the first inductor L1 and the second capacitor C2.

The temperature control circuit detects the voltage of the temperature detection circuit comprising the thermistor and transmits the voltage detection result to the control module, namely the control module outputs different PWM pulses to the LED drive circuit according to specific voltage, and the LED drive circuit can change the brightness of the LED according to different PWM pulses, so that the temperature control circuit can adjust the brightness of the LED according to different temperatures, the heat productivity of the LED can be reduced, and the use comfort of a user is improved.

The temperature control circuit is applied to a lighting device, in this embodiment, the lighting device is a flashlight, as shown in fig. 1 to 2, and the lighting device includes the temperature control circuit, a switch circuit 4, a power circuit 5 and an electric quantity indication module. The temperature detection circuit in the temperature control circuit can be arranged at the hand holding part of the flashlight and used for dynamically adjusting the brightness of the LED according to the temperature detection result of the hand of the user.

The switch circuit 4 includes a key S1, one end of the key S1 is connected to the control module 1, and the other end of the key S1 is grounded.

The power circuit 5 comprises a battery BAT1, a voltage stabilizing module U2, a twelfth capacitor C12 and a ninth capacitor C9, the negative electrode of the battery BAT1 is grounded, the positive electrode of the battery BAT1 is connected with the input end of the voltage stabilizing module U2 and one end of the twelfth capacitor C12, the other end of the twelfth capacitor C12 is grounded, a second voltage VDD is correspondingly output between the positive electrode of the battery BAT1 and the input end of the voltage stabilizing module U2, the ground end of the voltage stabilizing module U2 is grounded, the output end of the voltage stabilizing module U2 outputs a first voltage VCC, the output end of the voltage stabilizing module U2 is further connected with one end of the ninth capacitor C9, and the other end of the ninth capacitor C9 is grounded. In this embodiment, the first voltage VCC is 3.3V, and the voltage regulator module U2 is a common voltage reduction chip, and is configured to reduce the voltage output by the battery BAT1 to 3.3V for use by other circuits.

The electric quantity indicating module comprises an electric quantity detecting circuit 6 and an indicating circuit 7, the electric quantity detecting circuit 6 and the indicating circuit 7 are both connected with the control module 1, and the control module 1 controls the indicating circuit 7 according to the detection result of the electric quantity detecting circuit 6. The electric quantity detection circuit 6 comprises a twenty-fourth resistor R24, a twenty-fifth resistor R25 and an eleventh capacitor C11, the twenty-fourth resistor R24 and the twenty-fifth resistor R25 are connected in series, the other end of the twenty-fourth resistor R24 is connected with a second voltage VDD, the other end of the twenty-fifth resistor R25 is grounded, one end of the eleventh capacitor C11 is connected with an output end VIN of the electric quantity detection circuit 6 between the twenty-fourth resistor R24 and the twenty-fifth resistor R25, the output end VIN of the electric quantity detection circuit 6 is connected with the control module 1, and the other end of the eleventh capacitor C11 is grounded. The indication circuit 7 comprises a twentieth resistor R20, a first light emitting diode LED1 and a second light emitting diode LED2, the first light emitting diode LED1 and the second light emitting diode LED2 are connected in parallel and are connected in series with a twentieth resistor R20, the other end of the twentieth resistor R20 is connected to the first voltage VCC, and cathodes of the first light emitting diode LED1 and the second light emitting diode LED2 are respectively connected to the control module 1.

The first light emitting diode LED1 is red, and the second light emitting diode LED2 is green; after the voltage output at the second voltage VDD in the power circuit 5 is divided by the electric quantity detection circuit 6, the voltage of the output terminal VIN of the electric quantity detection circuit 6 is obtained, that is, whether the voltage of the output terminal VIN of the electric quantity detection circuit 6 is greater than a preset threshold value or not can be judged through the control module 2, if so, it is indicated that the electric quantity of the battery BAT1 is sufficient, a signal can be sent to the LED _ G through the control module 2 to control the second light emitting diode LED2 to be turned on, that is, the sufficient electric quantity of the battery is indicated; otherwise, a signal may be sent to the LED _ R through the control module 2 to control the first light emitting diode LED1 to light, i.e. to indicate the low battery.

Fig. 2 shows a specific circuit in the lighting device, where the control module 2 is a single chip, and the connection relationship between the module circuits is shown in fig. 2 by using a port, for example: the output terminal TEMP of the temperature detection circuit 1 is correspondingly connected with the 19 th port P16 of the single chip microcomputer U4, and the connection relations of other modules are similar. This is a common representation of connections in the circuit field.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A temperature control circuit, characterized by: the LED brightness control circuit comprises a temperature detection circuit (1), a control module (2) and an LED drive circuit (3), wherein the temperature detection circuit (1) and the LED drive circuit (3) are both connected with the control module (2), and the control module (2) is used for outputting PWM pulses to the LED drive circuit (3) according to the detection result of the temperature detection circuit (1), so that the LED brightness is adjusted.

2. The temperature control circuit of claim 1, wherein: temperature detect circuit (1) includes thermistor (R19) and eighteenth resistance, thermistor (R19) and eighteenth resistance are established ties mutually, first Voltage (VCC) is connected to the other end of eighteenth resistance, thermistor (R19)'s the other end ground connection, correspond between thermistor (R19) and the eighteenth resistance and be the output (TEMP) of temperature detect circuit (1).

3. The temperature control circuit of claim 2, wherein: the temperature detection circuit (1) further comprises a tenth capacitor (C10), one end of the tenth capacitor (C10) is connected between the thermistor (R19) and the eighteenth resistor, and the other end of the tenth capacitor (C10) is grounded.

4. The temperature control circuit of claim 1, wherein: the LED driving circuit (3) comprises a driving chip (U1), a first resistor (R1), a second resistor (R2), a third resistor (R3), a fifth resistor (R5), a first capacitor (C1), a second capacitor (C2), a third capacitor (C3), a fourth capacitor (C4), a first diode (D1), a second diode (D2), a first inductor (L1), a third light-emitting diode (LED3) and a first MOS tube (Q1);

the fifth resistor (R5) and the fourth capacitor (C4) are connected in series, the connection end between the fifth resistor (R5) and the fourth capacitor (C4) is connected with the 4 th pin of the driving chip (U1), the other end of the fifth resistor (R5) is connected with a first Voltage (VCC), and the other end of the fourth capacitor (C4) is grounded; one end of the first capacitor (C1) is connected with the 5 th pin of the driving chip (U1), and the other end of the first capacitor (C1) is grounded; one end of the second resistor (R2) is connected with the 3 rd pin of the driving chip (U1), the input end (PWM) of the LED driving circuit (3) is correspondingly arranged between the second resistor (R2) and the 3 rd pin of the driving chip (U1), and the other end of the second resistor (R2) is grounded; the 2 nd pin of the driving chip (U1) is grounded; a 6 th pin of the driving chip (U1) is respectively connected with a third resistor (R3), a first resistor (R1) and a source electrode of a first MOS (Q1), and the other ends of the third resistor (R3) and the first resistor (R1) are grounded; the 1 st pin of the driving chip (U1) is connected with the gate of a first MOS tube (Q1); the drain of the first MOS tube (Q1) is connected with the anode of the first diode (D1), the anode of the second diode (D2) and the cathode of the third light emitting diode (LED3), the anode of the third light emitting diode (LED3) is connected with one end of a first inductor (L1), the other end of the first inductor (L1) is connected with the cathode of the first diode (D1), the cathode of the second diode (D2), a second capacitor (C2) and a third capacitor (C3), the other ends of the second capacitor (C2) and the third capacitor (C3) are grounded, and a second Voltage (VDD) is connected between the first inductor (L1) and the second capacitor (C2).

5. An illumination device, characterized by: comprising a temperature control circuit according to any of the claims 1-4.

6. The illumination device of claim 5, wherein: the intelligent control device is characterized by further comprising a switch circuit (4), wherein the switch circuit (4) comprises a key (S1), one end of the key (S1) is connected with the control module (2), and the other end of the key (S1) is grounded.

7. The illumination device of claim 5, wherein: still include power supply circuit (5), power supply circuit (5) include battery (BAT1), voltage stabilizing module (U2), twelfth electric capacity (C12) and ninth electric capacity (C9), the negative pole ground connection of battery (BAT1), the positive pole of battery (BAT1) is connected the input of voltage stabilizing module (U2) and the one end of twelfth electric capacity (C12), the other end ground connection of twelfth electric capacity (C12), correspond between the positive pole of battery (BAT1) and the input of voltage stabilizing module (U2) and output second Voltage (VDD), the ground terminal ground connection of voltage stabilizing module (U2), the first Voltage (VCC) of output of voltage stabilizing module (U2), the one end of ninth electric capacity (C9) is still connected to the output of voltage stabilizing module (U2), the other end ground connection of ninth electric capacity (C9).

8. The illumination device as recited in claim 7, wherein: the electric quantity indicating device is characterized by further comprising an electric quantity indicating module, wherein the electric quantity indicating module comprises an electric quantity detecting circuit (6) and an indicating circuit (7), the electric quantity detecting circuit (6) and the indicating circuit (7) are both connected with the control module (2), and the control module (2) controls the indicating circuit (7) according to a detection result of the electric quantity detecting circuit (6).

9. The illumination device as recited in claim 8, wherein: the electric quantity detection circuit (6) comprises a twenty-fourth resistor (R24), a twenty-fifth resistor (R25) and an eleventh capacitor (C11), the twenty-fourth resistor (R24) and the twenty-fifth resistor (R25) are connected in series, the other end of the twenty-fourth resistor (R24) is connected with a second Voltage (VDD), the other end of the twenty-fifth resistor (R25) is grounded, one end of the eleventh capacitor (C11) is connected with the output end (VIN) between the twenty-fourth resistor (R24) and the twenty-fifth resistor (R25) and corresponding to the electric quantity detection circuit (6), the output end (VIN) of the electric quantity detection circuit (6) is connected with the control module (2), and the other end of the eleventh capacitor (C11) is grounded.

10. The illumination device as recited in claim 8, wherein: the indicating circuit (7) comprises a twentieth resistor (R20), a first light emitting diode (LED1) and a second light emitting diode (LED2), the first light emitting diode (LED1) and the second light emitting diode (LED2) are connected in parallel and are connected with the twentieth resistor (R20) in series, the other end of the twentieth resistor (R20) is connected with a first Voltage (VCC), and cathodes of the first light emitting diode (LED1) and the second light emitting diode (LED2) are respectively connected with the control module (2).