Driving circuit and lamp

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By simplifying the drive circuit structure and using inductors, capacitors, and diodes in conjunction with the modulation signal of the main control chip to control switches and transistors, the problem of high cost in existing drive circuits is solved, resulting in cost reduction and making it suitable for small electrical appliances with low profit margins.

CN223694034UActive Publication Date: 2025-12-19GUANGDONG MINHUA ELECTRIC APPLIANCE CO LTD

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Patent Information

Application Number: CN202422998251.5
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-12-05
Publication Date: 2025-12-19
Estimated Expiration: 2034-12-05

AI Technical Summary

Technical Problem

Existing drive circuits are expensive due to the use of drive chips, making them unsuitable for small electrical appliances with low profit margins.

Method used

The driving circuit, composed of inductors, capacitors, diodes, and a main control chip, controls the switching and transistors to turn on and off through the modulation signal of the main control chip, eliminating the need for a driver chip and simplifying the circuit structure.

Benefits of technology

This reduces the manufacturing cost of the drive circuit, making it suitable for small, low-profit electrical appliances.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a drive circuit and a lamp, and relates to the technical field of power supplies, the drive circuit comprises an inductor, a first capacitor and a diode, the cathode of the diode is connected with the anode of an input power supply and the anode of a load, the anode of the diode is connected with one end of the first capacitor and one end of the inductor, and the other end of the inductor is connected with the cathode of the load; the input end of the switch is connected with the anode of the diode, the output end of the switch is connected with one end of the first resistor, and the other end of the first resistor is grounded; a modulation pin of the main control chip is connected with the control end of the switch, a trigger pin of the main control chip is connected with the other end of the first capacitor, and a feedback pin of the main control chip is connected with the output end of the switch and one end of the first resistor. According to the driving circuit, a driving chip does not need to participate in driving the MOS transistor, the overall circuit structure is simple, the cost for purchasing the driving chip is saved, the manufacturing cost is reduced, and the driving circuit is suitable for small electric appliance products with low profits.

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Description

TECHNICAL FIELD

[0001] The utility model relates to power supply technical field especially relates to a drive circuit and lamps and lanterns. BACKGROUND

[0002] The drive circuit is the circuit that is used for amplifying the signal of control circuit, namely, the signal of control circuit is amplified to make it can drive power transistor, and then the transistor drives the load to work again.

[0003] The existing drive circuit often controls MOS tube through the drive chip, and the price of drive chip is higher, thereby leading to the existing drive circuit to have the problem of higher cost, and it is not suitable for popularization and use in the small electric appliance product of lower profit. UTILITY MODEL CONTENTS

[0004] The utility model discloses a drive circuit and lamps and lanterns, and the circuit structure is simple, and the manufacturing cost is low, and is applicable to the small electric appliance product of lower profit.

[0005] To solve the above technical problem, the utility model adopts the following technical scheme:

[0006] An aspect of the utility model embodiment provides a drive circuit, which comprises: an inductor, a first capacitor and a diode, the negative pole of the diode is connected with the positive pole of input power supply and the positive pole of load, the positive pole of the diode is connected with one end of the first capacitor and one end of the inductor, and the other end of the inductor is connected with the negative pole of load;A switch and a first resistor, the input end of the switch is connected with the positive pole of the diode, the output end of the switch is connected with one end of the first resistor, and the other end of the first resistor is grounded;A master control chip, the modulation pin of the master control chip is connected with the control end of the switch, the trigger pin of the master control chip is connected with the other end of the first capacitor, and the feedback pin of the master control chip is connected with the output end of the switch and one end of the first resistor.

[0007] In some embodiments, the switch comprises an NMOS tube and a second resistor, the drain of the NMOS tube is connected with the positive pole of the diode, the source of the NMOS tube is connected with the feedback pin of the master control chip, the gate of the NMOS tube is connected with one end of the second resistor, and the other end of the second resistor is connected with the modulation pin of the master control chip.

[0008] In some embodiments, the switch further comprises a PNP triode and a third resistor, an emitter of the PNP triode is connected to one end of the third resistor and a gate of the NMOS tube, a collector of the PNP triode is grounded, a base of the PNP triode is connected to the other end of the second resistor and a modulation pin of the master control chip, and the other end of the third resistor is connected to a source of the NMOS tube and a feedback pin of the master control chip.

[0009] In some embodiments, the drive circuit further comprises a fourth resistor, the fourth resistor is arranged between the other end of the first capacitor and a trigger pin of the master control chip.

[0010] In some embodiments, the drive circuit further comprises a voltage detection circuit, the voltage detection circuit comprises a fifth resistor and a sixth resistor, one end of the fifth resistor is connected to the other end of the inductor and a negative electrode of a load, the other end of the fifth resistor is connected to one end of the sixth resistor and a voltage detection pin of the master control chip, and the other end of the sixth resistor is grounded.

[0011] In some embodiments, the drive circuit further comprises a second capacitor, one end of the second capacitor is connected to a negative electrode of the diode and a positive electrode of a load, and the other end of the second capacitor is connected to the other end of the inductor and a negative electrode of a load.

[0012] In some embodiments, the drive circuit further comprises a third capacitor, a positive electrode of the third capacitor is connected to a positive electrode of an input power supply, and a negative electrode of the third capacitor is grounded.

[0013] In some embodiments, the drive circuit further comprises an interface, a positive input end of the interface is connected to a negative electrode of the diode and a positive electrode of an input power supply, a negative input end of the interface is connected to the other end of the inductor, and the interface is used for connecting a load.

[0014] An aspect of an embodiment of the utility model provides a lamp, the lamp comprises the drive circuit as described above.

[0015] According to the drive circuit and the lamp, the following beneficial effects are achieved: the drive circuit does not need a driving chip to drive the MOS transistor, the overall circuit structure is simple, the cost of purchasing the driving chip is saved, the manufacturing cost is reduced, and the drive circuit is suitable for low-profit small electric appliances.

[0016] It should be understood that the foregoing general description and the following detailed description are only examples, and cannot limit the disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0018] Figure 1 The driving circuit schematic diagram according to the embodiment. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, and not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present application.

[0020] The terms "first", "second", "third" are only for description purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second", "third" can explicitly or implicitly include one or more features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0021] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrally connected; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0022] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations may, however, be implemented in many different forms and should not be construed as limited to the examples set forth herein; rather, these examples are provided so that this disclosure will be thorough and complete, and will fully convey the inventive aspects of the example implementations to those skilled in the art. The accompanying drawings are included to provide a further understanding of the disclosure and are incorporated into and constitute a part of this specification. Like reference numbers refer to like elements throughout the drawings, and thus continuous numbering of elements over several figures is implied unless the context clearly dictates otherwise.

[0023] The technical solutions of the embodiments of the present application will be described briefly as follows:

[0024] According to some embodiments, asFigure 1 As shown in the accompanying drawings, the application provides a driving circuit, which comprises:

[0025] an inductor L, a first capacitor C1 and a diode D, a negative electrode of the diode D being connected to a positive electrode of an input power supply and a positive electrode of a load, a positive electrode of the diode D being connected to one end of the first capacitor C1 and one end of the inductor L, the other end of the inductor L being connected to a negative electrode of the load;

[0026] a switch and a first resistor R1, an input end of the switch being connected to the positive electrode of the diode D, an output end of the switch being connected to one end of the first resistor R1, the other end of the first resistor R1 being grounded;

[0027] a master control chip, a modulation pin of the master control chip being connected to a control end of the switch, a trigger pin of the master control chip being connected to the other end of the first capacitor C1, and a feedback pin of the master control chip being connected to the output end of the switch and one end of the first resistor R1.

[0028] Wherein, the master control chip outputs a PWM modulation signal to the control end of the switch through the modulation pin, so that the switch repeatedly performs the actions of conduction and cutoff. When the switch is in conduction, the load is grounded through the switch; when the switch is in cutoff, the inductor L performs freewheeling through the diode D. The driving circuit of the application does not need a driving chip to drive the MOS transistor, the overall circuit structure is simple, the cost of purchasing the driving chip is saved, the manufacturing cost is reduced, and it is suitable for small electrical products with lower profits.

[0029] The accompanying drawings are referred to in the following description of the application. Figure 1 The preferred embodiments of the present disclosure are further elaborated.

[0030] According to some embodiments, as Figure 1 As shown in the accompanying drawings, the switch comprises an NMOS tube and a second resistor R2, a drain electrode of the NMOS tube being connected to the positive electrode of the diode D, a source electrode of the NMOS tube being connected to the feedback pin of the master control chip, a gate electrode of the NMOS tube being connected to one end of the second resistor R2, and the other end of the second resistor R2 being connected to the modulation pin of the master control chip.

[0031] Wherein, the master control chip outputs a PWM modulation signal to the gate electrode of the NMOS tube through the modulation pin, so that the NMOS tube repeatedly performs the actions of conduction and cutoff. When the PWM modulation signal is at a high level, the NMOS tube is in conduction, and the load is grounded through the switch; when the PWM modulation signal is at a low level, the NMOS tube is in cutoff, and the inductor L performs freewheeling through the diode D.

[0032] Further, as Figure 1As shown, the switch further comprises a PNP transistor and a third resistor R3, an emitter of the PNP transistor is connected to one end of the third resistor R3 and a gate of the NMOS tube, a collector of the PNP transistor is grounded, a base of the PNP transistor is connected to the other end of the second resistor R2 and a modulation pin of the master control chip, the other end of the third resistor R3 is connected to a source of the NMOS tube and a feedback pin of the master control chip.

[0033] The master control chip outputs a PWM modulation signal to the base of the PNP transistor and the gate of the NMOS tube through the modulation pin, so that the NMOS tube and the PNP transistor repeatedly perform the actions of conduction and cut-off. When the PWM modulation signal is at a high level, the PNP transistor is cut off and the NMOS tube is turned on, and the load is grounded through the NMOS tube; when the PWM modulation signal is at a low level, the PNP transistor is turned on and the NMOS tube is cut off, and the inductor L performs freewheeling through the diode D.

[0034] The PNP transistor can be used to quickly pull down the voltage at the gate of the NMOS tube, so that the NMOS tube is quickly turned off, and the voltage at the source of the NMOS tube is quickly pulled down.

[0035] According to some embodiments, as shown in Figure 1 As shown, the drive circuit further comprises a fourth resistor R4, which is arranged between the other end of the first capacitor C1 and a trigger pin of the master control chip.

[0036] According to some embodiments, as shown in Figure 1 As shown, the drive circuit further comprises a voltage detection circuit, which comprises a fifth resistor R5 and a sixth resistor R6, one end of the fifth resistor R5 is connected to the other end of the inductor L and a negative electrode of the load, the other end of the fifth resistor R5 is connected to one end of the sixth resistor R6 and a voltage detection pin of the master control chip, and the other end of the sixth resistor R6 is grounded.

[0037] The fifth resistor R5 and the sixth resistor R6 are used for voltage division, and the fifth resistor R5 and the sixth resistor R6 input the voltage after voltage division to the voltage detection pin of the master control chip, so that the master control chip performs voltage detection.

[0038] According to some embodiments, as shown in Figure 1 As shown, the drive circuit further comprises a second capacitor C1, one end of the second capacitor C1 is connected to a negative electrode of the diode D and a positive electrode of the load, and the other end of the second capacitor C1 is connected to the other end of the inductor L and a negative electrode of the load.

[0039] The second capacitor C1 is used for load filtering.

[0040] According to some embodiments, as shown in Figure 1 As shown, the drive circuit further comprises a third capacitor C3, a positive electrode of the third capacitor C3 is connected to a positive electrode of an input power supply, and a negative electrode of the third capacitor C3 is grounded.

[0041] The third capacitor C3 is used for input power filtering.

[0042] According to some embodiments, as shown in Figure 1 The driving circuit further comprises an interface, a negative electrode of the diode D is connected to a positive electrode of the input power, and the other end of the inductor L is connected to a negative electrode input end of the interface, and the interface is used for connecting a load.

[0043] According to some embodiments, the application provides a lamp, which comprises the driving circuit as described above.

[0044] When the lamp is connected to the interface, the first capacitor C1 is charged to a high level, and the master control chip outputs a PWM modulation signal to the base of the PNP transistor and the gate of the NMOS transistor through the modulation pin, so that the NMOS transistor and the PNP transistor repeatedly perform the actions of conduction and cut-off. When the PWM modulation signal is at a high level, the PNP transistor is cut off, the NMOS transistor is turned on, and the lamp is grounded through the NMOS transistor; when the PWM modulation signal is at a low level, the PNP transistor is turned on, and the PNP transistor pulls down the gate voltage of the NMOS transistor, so that the NMOS transistor is cut off, and the inductor L flows through the diode D. The PWM modulation signal makes the NMOS transistor and the PNP transistor repeatedly perform the actions of conduction and cut-off, and also makes the lamp work. When the input of the PWM modulation signal is stopped, the NMOS transistor is cut off, and the lamp stops working.

[0045] In the description of the above-described embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0046] Although the present disclosure has been described with reference to several exemplary embodiments, it is understood that the terms used are illustrative and not restrictive, and the present disclosure is not limited to any of the above-described details. Since the present disclosure can be embodied in various forms without departing from the spirit or essential characteristics thereof, it should be understood that the above-described embodiments are not limited to any of the above-described details, but are to be interpreted broadly and be construed as including all changes and modifications falling within the scope of the appended claims or equivalents thereof.

Claims

1. A drive circuit characterized by comprising: The drive circuit comprises: an inductor, a first capacitor and a diode, a negative electrode of the diode being connected to a positive electrode of an input power supply and a positive electrode of a load, a positive electrode of the diode being connected to one end of the first capacitor and one end of the inductor, the other end of the inductor being connected to a negative electrode of the load; a switch and a first resistor, an input end of the switch being connected to the positive electrode of the diode, an output end of the switch being connected to one end of the first resistor, the other end of the first resistor being grounded; a master control chip, a modulation pin of the master control chip being connected to a control end of the switch, a trigger pin of the master control chip being connected to the other end of the first capacitor, a feedback pin of the master control chip being connected to the output end of the switch and one end of the first resistor.

2. The drive circuit according to claim 1, characterized by The switch comprises an NMOS tube and a second resistor, a drain of the NMOS tube being connected to the positive electrode of the diode, a source of the NMOS tube being connected to the feedback pin of the master control chip, a gate of the NMOS tube being connected to one end of the second resistor, the other end of the second resistor being connected to the modulation pin of the master control chip.

3. The drive circuit according to claim 2, characterized in that, The switch further comprises a PNP triode and a third resistor, an emitter of the PNP triode being connected to one end of the third resistor and the gate of the NMOS tube, a collector of the PNP triode being grounded, a base of the PNP triode being connected to the other end of the second resistor and the modulation pin of the master control chip, the other end of the third resistor being connected to the source of the NMOS tube and the feedback pin of the master control chip.

4. The drive circuit according to claim 1, characterized by The drive circuit further comprises a fourth resistor, the fourth resistor being arranged between the other end of the first capacitor and the trigger pin of the master control chip.

5. The drive circuit according to claim 1, characterized by The drive circuit further comprises a voltage detection circuit, the voltage detection circuit comprising a fifth resistor and a sixth resistor, one end of the fifth resistor being connected to the other end of the inductor and the negative electrode of the load, the other end of the fifth resistor being connected to one end of the sixth resistor and a voltage detection pin of the master control chip, the other end of the sixth resistor being grounded.

6. The drive circuit of claim 1, wherein The drive circuit further comprises a second capacitor, one end of the second capacitor being connected to the negative electrode of the diode and the positive electrode of the load, the other end of the second capacitor being connected to the other end of the inductor and the negative electrode of the load.

7. The drive circuit according to claim 1, characterized by The drive circuit further comprises a third capacitor, a positive electrode of the third capacitor being connected to the positive electrode of the input power supply, a negative electrode of the third capacitor being grounded.

8. The drive circuit of claim 1, wherein, The drive circuit further comprises an interface, a positive electrode input end of the interface being connected to the negative electrode of the diode and the positive electrode of the input power supply, a negative electrode input end of the interface being connected to the other end of the inductor, the interface being used for connecting the load.

9. A luminaire characterized by, The lamp comprises the drive circuit according to any one of claims 1 to 8.