A low standby power consumption circuit and LED lamp for electronic products

Abstract

The present invention relates to the field of circuit technology, and in particular to a low standby power consumption circuit and LED lamp for electronic products. The present invention discloses a low standby power consumption circuit and LED lamp for electronic products, wherein the low standby power consumption circuit of the electronic product comprises a power supply circuit, a voltage regulating circuit and an MCU control circuit, the input end of the power supply circuit is connected to the input power supply, the output end of the power supply circuit is connected to the power supply end of the MCU control circuit through the voltage regulating circuit, the control output end of the MCU control circuit is connected to the control input end of the voltage regulating circuit, when the electronic product is working normally, the MCU control circuit controls the voltage regulating circuit to output a voltage that is the working voltage of the MCU control circuit; when the electronic product is on standby, the MCU control circuit controls the voltage regulating circuit to output a dormant voltage that is less than the working voltage of the MCU control circuit. The present invention has lower standby power consumption, simple structure, easy implementation and low cost.

Description

Technical Field

[0001] The invention belongs to the technical field of circuits, and in particular relates to a low standby power consumption circuit and an LED lamp of an electronic product. Background Art

[0002] Compared with traditional lighting products, smart lighting products integrate communication, sensing and other functions, and have better lighting performance. They are one of the key development directions in the current LED lighting technology field. Smart lighting products have a complex circuit structure and many unit circuits. Each module circuit will inevitably consume power when in standby mode. With the popularization of smart lighting products, the total amount of standby power consumption is quite alarming, so it is very necessary to control its standby power consumption.

[0003] Although some smart lighting products now have low standby power consumption processing, which reduces the standby power consumption to a certain extent, they all achieve this by disconnecting the main power circuit when in standby mode, while the MCU processor is still powered by the working voltage and is not powered off. For example, the LED signal light drive circuit disclosed in the public patent: CN103369763B still has high standby power consumption. Summary of the invention

[0004] The purpose of the present invention is to provide a low standby power consumption circuit and LED lamp for electronic products to solve the above-mentioned technical problems.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a low standby power consumption circuit of an electronic product, including a power supply circuit, a voltage regulation circuit and an MCU control circuit, the input end of the power supply circuit is connected to an input power supply, the output end of the power supply circuit is connected to the power supply end of the MCU control circuit through the voltage regulation circuit, the control output end of the MCU control circuit is connected to the control input end of the voltage regulation circuit, when the electronic product works normally, the MCU control circuit controls the voltage output of the voltage regulation circuit to be the working voltage of the MCU control circuit; when the electronic product is on standby, the MCU control circuit controls the voltage regulation circuit to output a sleep voltage that is less than the working voltage of the MCU control circuit.

[0006] Furthermore, the voltage regulation circuit includes a first switch circuit and a second switch circuit, the input ends of the first switch circuit and the second switch circuit are simultaneously connected to the output end of the power supply circuit, the output ends of the first switch circuit and the second switch circuit are simultaneously connected to the power supply end of the MCU control circuit, the control input ends of the first switch circuit and the second switch circuit are respectively connected to the first control output end and the second control output end of the MCU control circuit, the first control output end of the MCU control circuit outputs a high-level signal or a low-level signal to control the first switch circuit to be turned on to provide a working voltage for the MCU control circuit, and the second control output end of the MCU control circuit outputs a PWM signal to control the second switch circuit to be intermittently turned on to provide a sleep voltage for the MCU control circuit.

[0007] Furthermore, the first switching circuit includes an NPN transistor Q2, the collector of the NPN transistor Q2 is connected to the output end of the power supply circuit, the emitter of the NPN transistor Q2 is connected to the power supply end of the MCU control circuit, and the first control output end of the NPN transistor Q2 is connected to the MCU control circuit.

[0008] Furthermore, the second switching circuit includes an NPN transistor Q3, the collector of the NPN transistor Q3 is connected to the output end of the power supply circuit, the emitter of the NPN transistor Q3 is connected to the power supply end of the MCU control circuit, and the NPN transistor Q3 is connected to the second control output end of the MCU control circuit.

[0009] Furthermore, a filter circuit is provided at the power supply end of the MCU control circuit.

[0010] Furthermore, the power supply circuit is a step-down circuit.

[0011] Furthermore, it also includes a main power supply circuit and a third switch circuit. The input end of the main power supply circuit is connected to the input power supply. The main power supply circuit supplies power to all power circuits of the electronic product except the MCU control circuit. The MCU control circuit controls the on and off of the main power supply circuit through the third switch circuit.

[0012] The invention also discloses an LED lamp provided with the low standby power consumption circuit of the electronic product.

[0013] Furthermore, it also includes an LED light source, the main power supply circuit is a constant current circuit, the output end of the constant current circuit is connected to the LED light source, and the MCU control circuit is connected to the control end of the constant current control chip of the constant current circuit through a third switch circuit to control the on and off of the constant current circuit.

[0014] Furthermore, it also includes a dimming circuit, which is connected between the output end of the constant current circuit and the LED light source, and the control end of the dimming circuit is connected to the control output end of the MCU control circuit.

[0015] Beneficial technical effects of the present invention:

[0016] When in standby mode, the present invention only provides the MCU control circuit with a sleep voltage that is lower than the working voltage of the MCU control circuit, thereby having lower standby power consumption, and the circuit structure is simple, easy to implement, low cost, and has huge social and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A circuit block diagram of a low standby power consumption circuit of an electronic product according to a first embodiment of the present invention;

[0019] Figure 2 A circuit diagram of a low standby power consumption circuit of an electronic product according to a first embodiment of the present invention;

[0020] Figure 3 This is a circuit block diagram of an LED lamp according to Embodiment 2 of the present invention;

[0021] Figure 4 This is a circuit diagram of an LED lamp according to Embodiment 2 of the present invention;

[0022] Figure 5 It is a schematic diagram of the PWM signal and sleep voltage waveform of the present invention. DETAILED DESCRIPTION

[0023] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0024] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0025] Embodiment 1

[0026] like Figure 1 and 2As shown, a low standby power consumption circuit of an electronic product includes a power supply circuit 4, a voltage regulating circuit and an MCU control circuit 1. The input end of the power supply circuit 4 is connected to an input power supply 7, the output end of the power supply circuit 4 is connected to the power supply end of the MCU control circuit 1 through the voltage regulating circuit, and the control output end of the MCU control circuit 1 is connected to the control input end of the voltage regulating circuit. When the electronic product is working normally, the MCU control circuit 1 controls the voltage regulating circuit to output a voltage that is the working voltage of the MCU control circuit 1, that is, the voltage required for normal work, which is generally 5V; when the electronic product is on standby, the MCU control circuit 1 controls the voltage regulating circuit to output a sleep voltage that is less than the working voltage of the MCU control circuit 1, preferably half of the working voltage of the MCU control circuit 1 or lower, to maintain the minimum power supply of the MCU processor and make the standby power consumption lower.

[0027] In this specific embodiment, the MCU control circuit 1 is composed of an MCU processor U4 and its peripheral circuits. The operating voltage of the MCU processor U4 is 5V. The specific circuit structure is as follows: Figure 2 As shown, but not limited to this.

[0028] Preferably, in this embodiment, the voltage regulation circuit includes a first switch circuit 2 and a second switch circuit 3, the input ends of the first switch circuit 2 and the second switch circuit 3 are simultaneously connected to the output end of the power supply circuit 4, the output ends of the first switch circuit 2 and the second switch circuit 3 are simultaneously connected to the power supply end of the MCU control circuit 1, that is, the 9th pin of the MCU processor U4, the control input ends of the first switch circuit 2 and the second switch circuit 3 are respectively connected to the first control output end and the second control output end of the MCU control circuit 1, that is, the 20th pin and the 10th pin of the MCU processor U4, the 20th pin of the MCU processor U4 outputs a high level signal or a low level signal to control the first switch circuit 2 to be turned on to provide a working voltage for the MCU processor U4, which is 5V in this specific embodiment, but is not limited to this, the 10th pin of the MCU processor U4 outputs a PWM signal to control the second switch circuit 3 to be intermittently turned on to provide a sleep voltage for the MCU processor U4, which is 2.5V in this specific embodiment, but is not limited to this.

[0029] The voltage regulation circuit has a simple circuit structure, low performance requirements for the MCU processor U4, is easy to implement, and has a lower cost, but is not limited to this. In some embodiments, the voltage regulation circuit may also use only one switching circuit, and a control pin of the MCU processor U4 may be used to control the output of a high-level signal, a low-level signal, or a PWM signal; or other existing voltage regulation circuits that can adjust the output voltage may be used to implement it.

[0030] Preferably, in this specific embodiment, the first switch circuit 2 includes an NPN transistor Q2, the collector of the NPN transistor Q2 is connected to the output end of the power supply circuit 4, the emitter of the NPN transistor Q2 is connected to the 9th pin of the MCU processor U4, and the NPN transistor Q2 is connected to the 20th pin of the MCU processor U4. The first switch circuit 2 has a simple circuit structure, is easy to implement, and has low cost, but is not limited to this. In other embodiments, the first switch circuit 2 can also be implemented by other switch tubes such as MOS tubes.

[0031] Preferably, in this specific embodiment, the second switch circuit 3 includes an NPN transistor Q3, the collector of the NPN transistor Q3 is connected to the output end of the power supply circuit 4, the emitter of the NPN transistor Q3 is connected to the 9th pin of the MCU processor U4, and the NPN transistor Q3 is connected to the 10th pin of the MCU processor U4. The second switch circuit 3 is simple in circuit structure, easy to implement, and low in cost, but it is not limited thereto. In other embodiments, the first switch circuit 2 can also be implemented by other switch tubes such as MOS tubes.

[0032] In this specific embodiment, the power supply end of the MCU control circuit 1 is also provided with a filter circuit to improve the stability of the power supply, thereby improving the stability of the system operation. Specifically, the filter circuit includes a capacitor C9, a resistor R44 and a capacitor C18. For specific circuit connections, please refer to Figure 2 , I will not go into details about this.

[0033] In this specific embodiment, the power supply circuit 4 is a step-down circuit, and the output voltage is 5V, but it is not limited to this. In other embodiments, the power supply circuit 4 can also be implemented by other existing power supply circuits.

[0034] Specifically, in this embodiment, the power supply circuit 4 is composed of a step-down chip U2 and its peripheral circuits. For details on the circuit structure, see Figure 2 , I will not go into details about this.

[0035] In this specific embodiment, a main power circuit 6 and a third switch circuit 5 are also included. The input end of the main power circuit 6 is connected to an input power supply 7. The main power circuit 6 supplies power to all power circuits of the electronic product except the MCU control circuit 1. The MCU control circuit 1 controls the on and off of the main power circuit 1 through the third switch circuit 3. When the electronic product is on standby, the MCU control circuit 1 controls the main power circuit 1 to be disconnected through the third switch circuit 3. All power circuits of the electronic product except the MCU control circuit 1 are not powered, thereby reducing standby power consumption.

[0036] Embodiment 2

[0037] like Figure 3 and 4As shown, this embodiment discloses an LED lamp provided with the low standby power consumption circuit of the above-mentioned electronic product.

[0038] In this specific embodiment, the main power circuit 6 is a constant current circuit, which is composed of a constant current control chip U1 and its peripheral circuits. For details on the circuit structure, see Figure 4 This will not be elaborated, but it is not limited to this. In other embodiments, the main power circuit 6 can also be implemented by other constant current circuits.

[0039] In this specific embodiment, it also includes an LED light source 9 and a dimming circuit 8. The output end of the constant current circuit 6 is connected to the LED light source 9 through the dimming circuit 8, and the control end of the dimming circuit 8 is connected to the control output end of the MCU control circuit 1.

[0040] Specifically, in this embodiment, the dimming circuit 8 is composed of a dimming chip U3 and its peripheral circuits. For specific circuit connections, please refer to Figure 4 Of course, in other embodiments, the dimming circuit 8 can also be implemented by using other existing dimming circuits.

[0041] In this specific embodiment, the third switch circuit 5 includes an NPN transistor Q4, the collector of the NPN transistor Q4 is connected to the power supply terminal VDD (pin 3) of the constant current control chip U1, the emitter of the NPN transistor Q4 is grounded, and the base of the NPN transistor Q4 is connected to the 19th pin (control output terminal) of the MCU processor U4. The third switch circuit 5 has a simple circuit structure, low cost, and is easy to implement, but is not limited to this. In other embodiments, the third switch circuit 5 can also be implemented by other switch tubes such as MOS tubes.

[0042] When the LED lamp is working normally, pin 20 of the MCU processor U4 outputs a high level, pin 10 outputs a low level, pin 19 outputs a low level, NPN transistor Q2 is turned on, NPN transistor Q3 is turned off, and NPN transistor Q4 is turned off. The power supply circuit 4 provides 5V voltage (working voltage) to the MCU processor U4 through the NPN transistor Q2. The MCU processor U4 works normally, and the constant current circuit 6 also works to supply power to the dimming circuit 8 and the LED light source 9. The MCU processor U4 can perform corresponding dimming through the dimming circuit 8.

[0043] When the LED lamp is in standby mode, the 19th pin of the MCU processor U4 outputs a high level, the NPN transistor Q4 is turned on, and the Vcc of the constant current control chip U1 is turned off, so that the constant current circuit 6 and the dimming circuit 8 are not powered and are in a non-working state, thereby reducing the standby power consumption; the 20th pin of the MCU processor U4 outputs a low level, the NPN transistor Q2 is turned off, and the 10th pin of the MCU processor U4 outputs a PWM signal (such as Figure 5As shown), the NPN transistor Q3 is driven to be intermittently turned on, and a 2.5V voltage (sleep voltage) is output to power the MCU processor U4, which can maintain the lowest working state of the MCU processor U4 and achieve ultra-low standby power consumption.

[0044] When in standby mode, the present invention only provides the MCU control circuit with a sleep voltage that is lower than the working voltage of the MCU control circuit, thereby having lower standby power consumption, and the circuit structure is simple, easy to implement, low cost, and has huge social and economic benefits.

[0045] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A low standby power consumption circuit for electronic products, characterized in that: It includes a power supply circuit, a voltage regulation circuit and an MCU control circuit. The input end of the power supply circuit is connected to the input power supply, the output end of the power supply circuit is connected to the power supply end of the MCU control circuit through the voltage regulation circuit, and the control output end of the MCU control circuit is connected to the control input end of the voltage regulation circuit. When the electronic product is working normally, the MCU control circuit controls the voltage regulation circuit to output a voltage that is the working voltage of the MCU control circuit; when the electronic product is on standby, the MCU control circuit controls the voltage regulation circuit to output a sleep voltage that is less than the working voltage of the MCU control circuit. The voltage regulating circuit comprises a first switch circuit and a second switch circuit, the input ends of the first switch circuit and the second switch circuit are simultaneously connected to the output end of the power supply circuit, the output ends of the first switch circuit and the second switch circuit are simultaneously connected to the power supply end of the MCU control circuit, the control input ends of the first switch circuit and the second switch circuit are respectively connected to the first control output end and the second control output end of the MCU control circuit, the first control output end of the MCU control circuit outputs a high level signal or a low level signal to control the first switch circuit to be turned on to provide a working voltage for the MCU control circuit, and the second control output end of the MCU control circuit outputs a PWM signal to control the second switch circuit to be intermittently turned on to provide a sleep voltage for the MCU control circuit; The first switch circuit comprises an NPN transistor Q2, the collector of the NPN transistor Q2 is connected to the output end of the power supply circuit, the emitter of the NPN transistor Q2 is connected to the power supply end of the MCU control circuit, and the first control output end of the NPN transistor Q2 is connected to the MCU control circuit; The second switch circuit includes an NPN transistor Q3, the collector of the NPN transistor Q3 is connected to the output end of the power supply circuit, the emitter of the NPN transistor Q3 is connected to the power supply end of the MCU control circuit, and the second control output end of the NPN transistor Q3 is connected to the MCU control circuit.

2. The low standby power consumption circuit of an electronic product according to claim 1, characterized in that: The power supply end of the MCU control circuit is also provided with a filter circuit.

3. The low standby power consumption circuit of an electronic product according to claim 1, characterized in that: The power supply circuit is a step-down circuit.

4. The low standby power consumption circuit of an electronic product according to any one of claims 1 to 3, characterized in that: It also includes a main power supply circuit and a third switch circuit. The input end of the main power supply circuit is connected to the input power supply. The main power supply circuit supplies power to all power circuits of the electronic product except the MCU control circuit. The MCU control circuit controls the on and off of the main power supply circuit through the third switch circuit.

5. An LED lamp, characterized in that: A low standby power consumption circuit for an electronic product as claimed in claim 4 is provided.

6. The LED lamp according to claim 5, characterized in that: It also includes an LED light source, the main power supply circuit is a constant current circuit, the output end of the constant current circuit is connected to the LED light source, and the MCU control circuit is connected to the control end of the constant current control chip of the constant current circuit through a third switch circuit to control the on and off of the constant current circuit.

7. The LED lamp according to claim 6, characterized in that: It also includes a dimming circuit, which is connected between the output end of the constant current circuit and the LED light source, and the control end of the dimming circuit is connected to the control output end of the MCU control circuit.

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