Control circuit of tripod lamp

Abstract

The utility model provides a control circuit of a tripod lamp, the control circuit comprises a light source, a conversion circuit, a charging circuit, a rechargeable battery and a main control circuit, the input end and the output end of the conversion circuit are respectively electrically connected with an external mains supply and the light source, and the conversion circuit is used for converting alternating current into direct current; the charging circuit is electrically connected with the conversion circuit; the input end and the output end of the rechargeable battery are electrically connected with the charging circuit and the light source respectively, and the rechargeable battery can supply power to the light source; the main control circuit comprises a single-chip microcomputer, the single-chip microcomputer is electrically connected with the conversion circuit and the charging circuit, and the single-chip microcomputer is used for monitoring whether external mains supply exists in the conversion circuit or not; when the single-chip microcomputer monitors that no mains supply exists, the single-chip microcomputer controls the rechargeable battery to supply power to the light source. When the single-chip microcomputer monitors that the mains supply exists, the single-chip microcomputer controls the conversion circuit to supply power to the light source, controls the charging circuit to charge the rechargeable battery and controls the rechargeable battery to stop supplying power to the light source.

Description

Technical Field

[0001] The utility model embodiment relates to the technical field of mobile floodlight working lamps, and in particular to a control circuit of a tripod lamp. Background Art

[0002] A tripod lamp is a work lamp, which is mainly used for lighting in the fields of auto repair, construction sites, medical emergency, etc. It has a wide lighting range.

[0003] In the related art, generally, a tripod lamp is connected to the mains via a wired plug and powered by AC power, or a battery is installed inside the tripod lamp and powered by the battery. However, whether it is powered by AC power or battery, there are certain limitations. The tripod lamp cannot work when there is no mains power or the battery is dead. In addition, the tripod lamp connected by a wired plug is less flexible to move, resulting in poor practicality and limiting its application range.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the utility model, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0005] The utility model aims to provide a control circuit for a tripod lamp, which at least to some extent overcomes the problem of poor practicability caused by the tripod lamp in the related art being powered solely by alternating current or battery.

[0006] Other features and advantages of the present invention will become apparent from the following detailed description, or may be learned in part by the practice of the present disclosure.

[0007] According to one aspect of the utility model, a control circuit of a tripod lamp is provided, the control circuit comprising a light source, a conversion circuit, a charging circuit, a rechargeable battery and a main control circuit, the input end and the output end of the conversion circuit are electrically connected to an external mains power supply and the light source, respectively, and the conversion circuit is used to convert alternating current into direct current; the charging circuit is electrically connected to the conversion circuit; the input end and the output end of the rechargeable battery are electrically connected to the charging circuit and the light source, respectively, and the rechargeable battery can supply power to the light source; the main control circuit comprises a single-chip microcomputer, the single-chip microcomputer is electrically connected to the conversion circuit and the charging circuit, respectively, and the single-chip microcomputer is used to monitor whether the conversion circuit has external mains power; wherein, when the single-chip microcomputer detects that there is no mains power, the single-chip microcomputer controls the rechargeable battery to supply power to the light source; when the single-chip microcomputer detects that there is mains power, the single-chip microcomputer controls the conversion circuit to supply power to the light source, and the single-chip microcomputer controls the charging circuit to charge the rechargeable battery, and controls the rechargeable battery to stop supplying power to the light source.

[0008] According to one embodiment of the utility model, the main control circuit also includes a first switch unit, which is electrically connected to the rechargeable battery, the light source and the single-chip microcomputer respectively, and the first switch unit has a MOS tube; wherein when the single-chip microcomputer controls the MOS tube to be turned on, the rechargeable battery supplies power to the light source; when the single-chip microcomputer controls the MOS tube to be turned off, the rechargeable battery stops supplying power to the light source.

[0009] According to an embodiment of the utility model, the conversion circuit includes a detection resistor, and the detection resistor is electrically connected to the single-chip microcomputer. When the mains power is present, the single-chip microcomputer can detect the voltage of the detection resistor.

[0010] According to an embodiment of the utility model, the main control circuit further includes a voltage stabilizing unit, which is electrically connected to the conversion circuit and the rechargeable battery respectively, and is used to supply power to the single chip microcomputer.

[0011] According to an embodiment of the utility model, the main control circuit further includes a voltage detection unit, which is electrically connected to the single chip microcomputer and the rechargeable battery respectively, and is used to detect the voltage of the rechargeable battery.

[0012] According to an embodiment of the utility model, the main control circuit further comprises an indicator light unit electrically connected to the single chip computer, the indicator light unit comprises at least two indicator lights, and the at least two indicator lights are used to indicate the power level of the rechargeable battery.

[0013] According to one embodiment of the utility model, the main control circuit also includes a second switch unit, which is electrically connected to the conversion circuit, the charging circuit and the single-chip microcomputer respectively, and the second switch unit has a MOS tube; wherein, when the single-chip microcomputer controls the MOS tube to be turned on, the conversion circuit supplies power to the charging circuit; when the single-chip microcomputer controls the MOS tube to be turned off, the conversion circuit stops supplying power to the charging circuit.

[0014] According to one embodiment of the utility model, the control circuit also includes a boost drive unit, the input end of the boost drive unit is electrically connected to the output end of the first switch unit and the output end of the conversion circuit respectively, and the output end of the boost drive unit is electrically connected to the light source.

[0015] According to one embodiment of the utility model, the boost driving unit has a boost constant current chip and a MOS tube, the input end and the output end of the boost constant current chip are electrically connected to the single-chip microcomputer and the MOS tube respectively, and the single-chip microcomputer controls the conduction degree of the MOS tube by outputting PWM signals with different duty cycles to control the brightness of the light source.

[0016] According to an embodiment of the utility model, the control circuit has a plurality of the light sources, and the main control circuit further includes a key unit, the key unit is electrically connected to the plurality of the light sources, and the key unit can control the working states of the plurality of the light sources respectively.

[0017] It can be seen from the above technical solution that the advantages and positive effects of the control circuit of the tripod lamp of the utility model are:

[0018] The control circuit of the tripod lamp provided by the utility model converts AC power into DC power through a conversion circuit, and the conversion circuit is electrically connected to the light source and the charging circuit respectively, the charging circuit is electrically connected to the rechargeable battery, and the single-chip microcomputer is electrically connected to the conversion circuit and the charging circuit respectively, and the single-chip microcomputer is used to monitor whether there is external AC power in the conversion circuit. When there is AC power, the single-chip microcomputer controls the conversion circuit to supply power to the light source, and the single-chip microcomputer controls the charging circuit to charge the rechargeable battery, and controls the rechargeable battery to stop supplying power to the light source; when there is no AC power, the single-chip microcomputer controls the rechargeable battery to supply power to the light source. In this way, the rechargeable battery can supply power to the light source alone, which greatly improves the flexibility of the tripod lamp in mobile operation, and can also realize charging and using AC power at the same time, supplying power to the light source while charging the rechargeable battery, and keeping the battery fully charged as much as possible for subsequent use, making the tripod lamp more practical.

[0019] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other features and advantages of the present invention will become more apparent by describing in detail example embodiments thereof with reference to the attached drawings.

[0021] Figure 1 An electrical schematic diagram of a control circuit of a tripod lamp in an embodiment of the present disclosure is shown.

[0022] Figure 2 A schematic diagram showing a conversion circuit in a control circuit of a tripod lamp in an embodiment of the present disclosure is shown.

[0023] Figure 3 A circuit diagram of a charging circuit and a second switch unit in a control circuit of a tripod lamp in an embodiment of the present disclosure is shown.

[0024] Figure 4 A circuit diagram of a rechargeable battery and a first switch unit in a control circuit of a tripod lamp in an embodiment of the present disclosure is shown.

[0025] Figure 5 A circuit diagram of a voltage stabilizing unit in a control circuit of a tripod lamp in an embodiment of the present disclosure is shown.

[0026] Figure 6A circuit diagram of a voltage detection unit in a control circuit of a tripod lamp in an embodiment of the present disclosure is shown.

[0027] Figure 7 A circuit diagram of a single chip microcomputer, an indicator light unit and a key unit in a control circuit of a tripod lamp in an embodiment of the present disclosure is shown.

[0028] Figure 8 A schematic diagram of a first boost driving unit in a control circuit of a tripod lamp in an embodiment of the present disclosure is shown.

[0029] Fig. 9 A schematic diagram of a second boost driving unit in a control circuit of a tripod lamp in an embodiment of the present disclosure is shown.

[0030] Fig.10 A schematic diagram showing a third boost driving unit in the control circuit of the tripod lamp in an embodiment of the present disclosure is shown.

[0031] The reference numerals are described as follows:

[0032] 100, single chip microcomputer; 110, first switch unit; 120, second switch unit; 130, indicator light unit; 140, key unit;

[0033] 200, conversion circuit; 210, fuse; 220, EMI filter circuit; 230, rectifier circuit; 240, step-down circuit; 241, first output terminal; 242, second output terminal; 243, third output terminal; 244, detection resistor;

[0034] 300, charging circuit; 310, rechargeable battery; 311, rechargeable battery output terminal;

[0035] 400. Light source. DETAILED DESCRIPTION

[0036] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0037] refer to Figure 1, this embodiment provides a control circuit for a tripod lamp, the control circuit comprising a light source 400, a conversion circuit 200, a charging circuit 300, a rechargeable battery 310 and a main control circuit. The input end and the output end of the conversion circuit 200 are electrically connected to the external mains power and the light source 400, respectively, and the conversion circuit 200 is used to convert alternating current into direct current. The charging circuit 300 is electrically connected to the conversion circuit 200, the input end and the output end of the rechargeable battery 310 are electrically connected to the charging circuit 300 and the light source 400, respectively, and the rechargeable battery 310 can supply power to the light source 400. The main control circuit comprises a single-chip microcomputer 100, the single-chip microcomputer 100 is electrically connected to the conversion circuit 200 and the charging circuit 300, respectively, and the single-chip microcomputer 100 is used to monitor whether there is external mains power in the conversion circuit 200. Among them, when the single-chip microcomputer 100 detects that there is no mains power, the single-chip microcomputer 100 controls the rechargeable battery 310 to supply power to the light source 400. When the single chip microcomputer 100 detects the presence of AC power, the single chip microcomputer 100 controls the conversion circuit 200 to supply power to the light source 400 , and the single chip microcomputer 100 controls the charging circuit 300 to charge the rechargeable battery 310 , and controls the rechargeable battery 310 to stop supplying power to the light source 400 .

[0038] In this embodiment, the alternating current is converted into direct current through the conversion circuit 200, and the conversion circuit 200 is electrically connected to the light source 400 and the charging circuit 300 respectively, the charging circuit 300 is electrically connected to the rechargeable battery 310, and the single-chip microcomputer 100 is electrically connected to the conversion circuit 200 and the charging circuit 300 respectively, and the single-chip microcomputer 100 is used to monitor whether there is external mains power in the conversion circuit 200. When there is mains power, the single-chip microcomputer 100 controls the conversion circuit 200 to supply power to the light source 400, and the single-chip microcomputer 100 controls the charging circuit 300 to charge the rechargeable battery 310, and controls the rechargeable battery 310 to stop supplying power to the light source 400; when there is no mains power, the single-chip microcomputer 100 controls the rechargeable battery 310 to supply power to the light source 400. In this way, the rechargeable battery 310 can power the light source 400 alone, greatly improving the flexibility of the tripod lamp in mobile operation. It can also be used while charging with AC power, powering the light source 400 while charging the rechargeable battery 310, keeping the battery as fully charged as possible for subsequent use, making the tripod lamp more practical.

[0039] refer to Figure 2 The conversion circuit 200 may include a fuse 210, an EMI filter circuit 220, a rectifier circuit 230 and a buck circuit 240. The fuse 210 is connected between the external AC power and the EMI filter circuit 220. The output end of the EMI filter circuit 220 is electrically connected to the input end of the rectifier circuit 230. The output end of the rectifier circuit 230 is electrically connected to the input end of the buck circuit 240.

[0040] When the external mains is used for power supply, the AC current passes through the fuse 210, the EMI filter circuit 220, the rectifier circuit 230 and the step-down circuit 240 in sequence. Among them, the EMI filter circuit 220 mainly functions to eliminate electromagnetic interference and achieve the effect of electromagnetic compatibility, the rectifier circuit 230 functions to convert the AC current into DC power, and the step-down circuit 240 functions to reduce the voltage of 220V to 24V output. Part of the voltage output by the step-down circuit 240 is used to power the light source 400, and part of it is used to power the charging circuit 300 to charge the rechargeable battery 310 (which can be a lithium battery), thereby realizing energy storage. Among them, the step-down circuit 240 can include a transformer and a constant voltage chip, the model of the transformer can be PQ3220, and the model of the constant voltage chip can be BP3609.

[0041] refer to Figure 2 and Figure 7 The step-down circuit 240 includes a detection resistor 244, which is connected in series with the voltage-dividing resistor R12A and the voltage-dividing resistor R11A. The thirteenth pin of the single-chip computer 100 is connected between the voltage-dividing resistor R11A and the detection resistor 244. The voltage-dividing resistor R12A and the voltage-dividing resistor R11A are connected in series to play a voltage-dividing role, thereby preventing the single-chip computer 100 from being damaged by excessive voltage. The single-chip computer 100 model may be CMS8S7885. If the thirteenth pin of the single-chip computer 100 can detect the voltage of the detection resistor 244, it indicates that the mains is present, otherwise, the mains is not present.

[0042] refer to Figure 2 , Figure 4 , Figure 7 and Figure 8 The main control circuit may further include a first switch unit 110, which is electrically connected to the rechargeable battery 310, the light source 400 and the single-chip computer 100 respectively, and the first switch unit 110 has a MOS tube.

[0043] Among them, the first switch unit 110 may include four MOS transistors (including MOS transistors Q011, Q011A, Q012, and Q012A), the gate of the MOS transistor Q011 is electrically connected to the third pin of the single-chip computer 100, the source of the MOS transistor Q011 is grounded, the drain of the MOS transistor Q011 is electrically connected to the gate of the MOS transistor Q012, the source of the MOS transistor Q012 is electrically connected to the battery output terminal, the drain of the MOS transistor Q012 is electrically connected to the drain of the MOS transistor Q012A, the source of the MOS transistor Q012A is electrically connected to the third output terminal 243 of the buck circuit 240, the gate of the MOS transistor Q012A is electrically connected to the drain of the MOS transistor Q011A, the gate of the MOS transistor Q011A is electrically connected to the third pin of the single-chip computer 100, and the source of the MOS transistor Q011A is grounded.

[0044] When the single chip microcomputer 100 detects that there is no AC power, the third pin of the single chip microcomputer 100 outputs a high level signal, and the MOS tubes Q011 and Q011A are in the on state, so that the MOS tubes Q012 and Q012A are also in the on state. At this time, the rechargeable battery 310 can power the light source 400.

[0045] When the single-chip computer 100 detects the presence of mains power, the third pin of the single-chip computer 100 outputs a low-level signal, and the MOS transistors Q011 and Q011A are in a cut-off state, so that the MOS transistors Q012 and Q012A are also in a cut-off state, and at this time, the rechargeable battery 310 stops supplying power to the light source 400. The first switch unit 110 can prevent current backflow and protect the rechargeable battery 310. It should be noted that the voltage of the rechargeable battery 310 is 18V, and the voltage of the third output terminal 243 of the step-down circuit 240 is 24V.

[0046] refer to Figure 2 , Figure 5 and Figure 7 The main control circuit may further include a voltage stabilizing unit, which is electrically connected to the conversion circuit 200 and the rechargeable battery 310 respectively, and is used to supply power to the single chip microcomputer 100.

[0047] The voltage stabilizing unit may include a voltage stabilizing chip U03 (model may be ME6203A100PG), a voltage stabilizing chip U04 (model may be ME6203A50PG), a diode D04, a diode D05, a plurality of capacitors and a plurality of resistors.

[0048] The rechargeable battery output terminal 311 is electrically connected to the positive electrode of the diode D04, and the negative electrode of the diode D04 is connected between the Vout pin of the voltage regulator chip U03 and the Vin pin of the voltage regulator chip U04. The rechargeable battery output terminal 311 outputs an 18V voltage, which can be reduced to 5V after passing through the voltage regulator chip U04 to power the microcontroller 100.

[0049] The second output terminal 242 of the step-down circuit 240 is electrically connected to the positive electrode of the diode D03, the negative electrode of the diode D03 is electrically connected to the Vin pin of the voltage regulator chip U03, and the Vout pin of the voltage regulator chip U03 is electrically connected to the Vin pin of U04. The second output terminal 242 of the step-down circuit 240 outputs a 24V voltage, which can be reduced to 5V after passing through the voltage regulator chip U03 and the voltage regulator chip U04 to power the single-chip computer 100. The diode D04 and the diode D05 can conduct current.

[0050] refer to Figure 4 , Figure 6 and Figure 7The main control circuit may further include a voltage detection unit, which is electrically connected to the single chip computer 100 and the rechargeable battery 310 respectively, and is used to detect the voltage of the rechargeable battery 310.

[0051] The voltage detection unit may include a resistor R62, a resistor R63, a resistor R64, a resistor R65, a resistor R59, a MOS transistor Q08, a MOS transistor Q09 and a capacitor CD6, wherein the fifth pin of the single-chip computer 100 is electrically connected to the gate of the MOS transistor Q09, the source of the MOS transistor Q09 is grounded, the drain of the MOS transistor Q09 is electrically connected to the gate of the MOS transistor Q08, the source of the MOS transistor Q08 is electrically connected to the output terminal 311 of the charging battery, and the drain of the MOS transistor Q08 is electrically connected to the twenty-second pin of the single-chip computer 100. A high-level signal is output through the fifth pin of the single-chip computer 100, and the MOS transistors Q08 and Q09 are both in a conducting state. After the current of the output terminal 311 of the charging battery flows through the MOS transistor Q08 and the resistor R61, the twenty-second pin of the single-chip computer 100 can receive a level signal.

[0052] The main control circuit may further include an indicator light unit 130 . The indicator light unit 130 may include four indicator lights. The four indicator lights are used to indicate the power level of the rechargeable battery 310 .

[0053] The four indicator lights may be LD1, LD2, LD3 and LD4, and are electrically connected to the sixth pin, the seventh pin, the eighth pin and the ninth pin of the single-chip microcomputer 100, respectively. The single-chip microcomputer 100 can control the sixth pin, the seventh pin, the eighth pin and the ninth pin to output high and low level signals according to the level signal received by the twenty-second pin, thereby controlling the on and off of LD1, LD2, LD3 and LD4. It should be noted that the present disclosure is not limited to four indicator lights, and the indicator light unit 130 may also have two indicator lights, three indicator lights, etc.

[0054] The power of the rechargeable battery 310 can be divided into 25%, 50%, 75% and 100%. For example, if only LD1 is on, it means that the remaining power is 25% or less; if only LD1 and LD2 are on, the remaining power is 25% to 50%; if only LD1, LD2 and LD3 are on, the remaining power is 50% to 75%; if all four lights LD1 to LD4 are on, the remaining power is 75% to 100%.

[0055] refer to Figure 2 , Figure 3 and Figure 7 The main control circuit may further include a second switch unit 120, which is electrically connected to the conversion circuit 200, the charging circuit 300 and the single-chip computer 100 respectively, and the second switch unit 120 has a MOS tube.

[0056] The second switch unit 120 may include a MOS transistor Q4 and a MOS transistor Q5, the source of the MOS transistor Q4 is electrically connected to the first output terminal 241 of the buck circuit 240, the drain of the MOS transistor Q4 is electrically connected to the IN pin of the power management chip of the charging circuit 300, the gate of the MOS transistor Q4 is electrically connected to the drain of the MOS transistor Q5, the source of the MOS transistor Q5 is grounded, and the gate of the MOS transistor Q5 is electrically connected to the seventeenth pin of the single-chip computer 100.

[0057] Among them, when the single-chip microcomputer 100 detects the presence of mains power, the seventeenth pin of the single-chip microcomputer 100 outputs a high-level signal, then the MOS tube Q5 is turned on, and the MOS tube Q4 is also turned on, so that the first output terminal 241 of the buck circuit 240 is connected to the input terminal of the charging circuit 300, so as to supply power to the charging circuit 300, so that the charging circuit 300 can charge the rechargeable battery 310. When the single-chip microcomputer 100 detects the absence of mains power, the seventeenth pin of the single-chip microcomputer 100 outputs a low-level signal, so that the first output terminal 241 of the buck circuit 240 is disconnected from the input terminal of the charging circuit 300, and the charging circuit 300 is stopped from being supplied with power.

[0058] refer to Figure 2 , Figure 7 , Figure 8 , Fig. 9 and Fig.10 The control circuit may further include a boost driving unit, an input end of the boost driving unit being electrically connected to an output end of the first switch unit 110 and an output end of the conversion circuit 200 , respectively, and an output end of the boost driving unit being electrically connected to the light source 400 .

[0059] The control circuit may include three boost drive units, which may be divided into a first boost drive unit, a second boost drive unit and a third boost drive unit. Correspondingly, the light source 400 may include LED1, LED2 and LED3, the output end of the first boost drive unit is connected to LED1, the output end of the second boost drive unit is connected to LED2, and the output end of the third boost drive unit is connected to LED3.

[0060] The first boost drive unit includes a constant current chip U1 (model may be OC6781), a VDD pin of the constant current chip U1 is electrically connected to the third output terminal 243 of the buck circuit 240 and the output terminal (labeled DC_OUT terminal) of the first switch unit 110, and a ROSC pin of the constant current chip U1 is electrically connected to the fourth pin of the single-chip microcomputer 100. When the fourth pin of the single-chip microcomputer 100 outputs a high level signal, LED1 is lit.

[0061] The DRV pin of the constant current chip U1 is electrically connected to the gate of the MOS tube Q1, the source of the MOS tube Q1 is electrically connected to the negative electrode of the LED1, the drain of the MOS tube Q1 is electrically connected to the positive electrode of the LED1, and the EN pin of the constant current chip U1 is electrically connected to the sixteenth pin of the single-chip microcomputer 100. The sixteenth pin of the single-chip microcomputer 100 can output a PWM signal, and the duty cycle of the PWM signal can be from 10% to 100%, and can be increased by 10% in sequence. The sixteenth pin of the single-chip microcomputer 100 outputs PWM signals with different duty cycles to control the conduction degree of the MOS tube Q1, thereby controlling the brightness of the LED1.

[0062] The second boost drive unit includes a constant current chip U2 (model may be OC6781), the VDD pin of the constant current chip U2 is electrically connected to the third output terminal 243 of the buck circuit 240 and the output terminal (labeled DC_OUT terminal) of the first switch unit 110, and the ROSC pin of the constant current chip U2 is electrically connected to the 21st pin of the single-chip microcomputer 100. When the 21st pin of the single-chip microcomputer 100 outputs a high level signal, LED2 is lit.

[0063] The DRV pin of the constant current chip U2 is electrically connected to the gate of the MOS tube Q2, the source of the MOS tube Q2 is electrically connected to the negative electrode of the LED2, the drain of the MOS tube Q2 is electrically connected to the positive electrode of the LED2, and the EN pin of the constant current chip U2 is electrically connected to the fifteenth pin of the single-chip microcomputer 100. The fifteenth pin of the single-chip microcomputer 100 can output a PWM signal, and the duty cycle of the PWM signal can be increased by 10% from 10% to 100%. The PWM signal with different duty cycles is output through the fifteenth pin of the single-chip microcomputer 100 to control the conduction degree of the MOS tube Q2, and then control the brightness of the LED2.

[0064] The third boost drive unit includes a constant current chip U3 (model may be OC6781), the VDD pin of the constant current chip U3 is electrically connected to the third output terminal 243 of the buck circuit 240 and the output terminal (labeled DC_OUT terminal) of the first switch unit 110, and the ROSC pin of the constant current chip U3 is electrically connected to the 20th pin of the single-chip microcomputer 100. When the 20th pin of the single-chip microcomputer 100 outputs a high level signal, LED3 is lit.

[0065] The DRV pin of the constant current chip U3 is electrically connected to the gate of the MOS tube Q3, the source of the MOS tube Q3 is electrically connected to the negative electrode of the LED3, the drain of the MOS tube Q3 is electrically connected to the positive electrode of the LED3, and the EN pin of the constant current chip U3 is electrically connected to the fourteenth pin of the single-chip microcomputer 100. The fourteenth pin of the single-chip microcomputer 100 can output a PWM signal, and the duty cycle of the PWM signal can be increased by 10% from 10% to 100%. The PWM signal with different duty cycles is output through the fourteenth pin of the single-chip microcomputer 100 to control the conduction degree of the MOS tube Q3, and then control the brightness of the LED3.

[0066] The main control circuit may further include a key unit 140 , which is electrically connected to the plurality of light sources 400 . The key unit 140 can control the working states of the plurality of light sources 400 respectively.

[0067] The key unit 140 may include three keys, namely, key KEY1 , key KEY2 and key KEY3 , which are electrically connected to the eleventh pin, the twelfth pin and the tenth pin of the single-chip computer 100 , respectively.

[0068] The single-chip microcomputer 100 can control the fourth pin and the sixteenth pin of the single-chip microcomputer 100 according to the control signal of the key KEY1, so that the fourth pin and the sixteenth pin output a high or low level signal, thereby controlling the working state of LED1. For example, when the key KEY1 is pressed once, the fourth pin of the single-chip microcomputer 100 outputs a high level to control LED1 to light up. When the key KEY1 is pressed for a long time, the sixteenth pin of the single-chip microcomputer 100 outputs a PWM signal with different duty cycles. The duty cycle of the PWM signal can be from 10% to 100%, and then from 100% to 10% in sequence. When the key KEY1 is released, the sixteenth pin of the single-chip microcomputer 100 stops outputting the changing PWM signal (for example, when released, the duty cycle is 50%, then the duty cycle of 50% is stably output). It should be noted that the use method of the keys KEY2 and KEY3 can be the same as that of the key KEY1. Of course, the keys KEY1, KEY2 and KEY3 can also be used in other ways to control the working states of LED1, LED2 and LED3, which will not be repeated here.

[0069] The first boost drive unit, the second boost drive unit and the third boost drive unit can be controlled individually through three buttons to control the three light sources 400 respectively. In this way, the three light sources 400 can be modularized, which is more convenient to use in practical applications. The luminous brightness can be controlled, and the irradiation angles of the three light sources 400 can be adjusted to achieve an illumination within a certain area within an acceptable range during work.

[0070] In the embodiments of the utility model, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the utility model can be understood according to the specific circumstances.

[0071] In the description of the utility model embodiments, it needs to be understood that the directions or positional relationships indicated by terms such as "up", "down", "left", "right", "front", and "back" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the utility model embodiments and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the utility model embodiments.

[0072] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model embodiment. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0073] The above are only preferred embodiments of the utility model embodiments, and are not intended to limit the utility model embodiments. For those skilled in the art, the utility model embodiments may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model embodiments shall be included in the protection scope of the utility model embodiments.

Claims

1. A control circuit for a tripod lamp, characterized in that: include: light source; A conversion circuit, wherein the input end and the output end of the conversion circuit are electrically connected to the external mains and the light source respectively, and the conversion circuit is used to convert alternating current into direct current; a charging circuit, electrically connected to the conversion circuit; A rechargeable battery, wherein an input end and an output end of the rechargeable battery are electrically connected to the charging circuit and the light source respectively, and the rechargeable battery can supply power to the light source; A main control circuit, comprising a single chip microcomputer, the single chip microcomputer is electrically connected to the conversion circuit and the charging circuit respectively, and the single chip microcomputer is used to monitor whether the conversion circuit has external mains power; Wherein, when the single chip microcomputer detects that there is no mains electricity, the single chip microcomputer controls the rechargeable battery to supply power to the light source; When the single chip microcomputer detects the presence of mains power, the single chip microcomputer controls the conversion circuit to supply power to the light source, and the single chip microcomputer controls the charging circuit to charge the rechargeable battery, and controls the rechargeable battery to stop supplying power to the light source.

2. The control circuit of the tripod lamp according to claim 1, characterized in that: The main control circuit further includes a first switch unit, which is electrically connected to the rechargeable battery, the light source and the single-chip computer respectively, and has a MOS tube; When the single chip microcomputer controls the MOS tube to be turned on, the rechargeable battery supplies power to the light source; when the single chip microcomputer controls the MOS tube to be turned off, the rechargeable battery stops supplying power to the light source.

3. The control circuit of the tripod lamp according to claim 1, characterized in that: The conversion circuit includes a detection resistor, which is electrically connected to the single-chip microcomputer. When the mains power is present, the single-chip microcomputer can detect the voltage of the detection resistor.

4. The control circuit of the tripod lamp according to claim 1, characterized in that: The main control circuit also includes a voltage stabilizing unit, which is electrically connected to the conversion circuit and the rechargeable battery respectively, and is used to supply power to the single chip microcomputer.

5. The control circuit of the tripod lamp according to claim 1, characterized in that: The main control circuit further comprises a voltage detection unit, which is electrically connected to the single chip microcomputer and the rechargeable battery respectively, and is used to detect the voltage of the rechargeable battery.

6. The control circuit of the tripod lamp according to claim 1, characterized in that: The main control circuit also includes an indicator light unit electrically connected to the single chip computer, and the indicator light unit includes at least two indicator lights, and the at least two indicator lights are used to indicate the power level of the rechargeable battery.

7. The control circuit of the tripod lamp according to claim 1, characterized in that: The main control circuit further includes a second switch unit, which is electrically connected to the conversion circuit, the charging circuit and the single-chip computer respectively, and has a MOS tube; When the single chip microcomputer controls the MOS tube to be turned on, the conversion circuit supplies power to the charging circuit; when the single chip microcomputer controls the MOS tube to be turned off, the conversion circuit stops supplying power to the charging circuit.

8. The control circuit of the tripod lamp according to claim 2, characterized in that: The control circuit further includes a boost driving unit, an input end of the boost driving unit is electrically connected to an output end of the first switch unit and an output end of the conversion circuit respectively, and an output end of the boost driving unit is electrically connected to the light source.

9. The control circuit of the tripod lamp according to claim 8, characterized in that: The boost drive unit comprises a boost constant current chip and a MOS tube. The input end and the output end of the boost constant current chip are electrically connected to the single chip microcomputer and the MOS tube respectively. The single chip microcomputer controls the conduction degree of the MOS tube by outputting PWM signals with different duty cycles to control the brightness of the light source.

10. The control circuit of the tripod lamp according to claim 1, characterized in that: The control circuit has a plurality of the light sources, and the main control circuit further includes a key unit, which is electrically connected to the plurality of the light sources and can control the working states of the plurality of the light sources respectively.

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