CN103543643A - Electric appliance standby power saving control circuit - Google Patents

Abstract

The invention discloses a power-saving control circuit for electrical appliances in standby. A standby device is connected in series in the power supply circuit. When the controller of the electrical appliance is in the standby state, the standby device cuts off the power supply circuit, and the power supply circuit cannot supply power to the entire control circuit. Thereby greatly reducing power consumption and reducing energy waste; on the other hand, the infrared receiving circuit or button control circuit on the first microcontroller is canceled, and the first microcontroller is directly controlled by the second microcontroller, When the second microcontroller receives the shutdown or startup command, it can not only control the relay to open or close, but also send the shutdown or startup command to the first microcontroller, and the first microcontroller receives the command and controls the corresponding load action; On the one hand, the working voltage of the relay and the second micro-control is supplied by the input power supply, without adding an additional power supply battery, and the structure is simple.

Description

Power saving control circuit for electrical appliances standby

technical field

The invention belongs to the field of electrical appliances, and in particular relates to a power-saving control circuit for electrical appliances in standby.

Background technique

"Standby energy consumption" refers to the power consumption that occurs when the electrical equipment with the standby function is not in use and the power supply is not disconnected. Electrical equipment with standby energy consumption mainly includes air conditioners, computers and communication systems (including computer hosts, display screens, computer audio, printers, scanners, chargers, routers, etc.), home video and audio systems (including TVs, DVDs, VCD, stereo, power amplifier, set-top box, satellite receiver, etc.). In order to avoid the trouble of frequently plugging and unplugging electrical appliances, or to save the settings for the use status of electrical appliances, many users are accustomed to using the remote control to turn off the electrical appliances conveniently without disconnecting the power supply, so that the electrical appliances are in a standby state for a long time. While the standby function provides convenience for residential users, it also causes a lot of energy waste and creates a huge pressure on environmental protection.

Referring to shown in Fig. 1, in the prior art, electrical appliance controller 10 is powered by power supply 11, comprises rectifier bridge 12, filter capacitor 13, switching power supply 14 and microcontroller 15, and power supply 11 is connected with rectifier bridge 12 and provides it with Voltage, the filter capacitor 13 is connected to both ends of the rectifier bridge 12, the output terminal of the rectifier bridge 12 is connected to the switching power supply 14, and the switching power supply 14 is respectively connected to the microcontroller 15 and the load to provide voltage thereto. The working principle of the electrical appliance controller 10 is: 220V AC mains power input, rectified by a rectifier bridge, filtered by a filter capacitor to form a 310VDC voltage, and then various DC low voltages (such as 5VDC, 12VDC, 15VDC, etc.), supplying microcontrollers, various drive circuits and low-voltage DC loads. During standby, although the microcontroller issues an instruction to power off the load, the switching power supply and the microcontroller of the entire control section still generate large power consumption at this time, resulting in energy waste.

In view of this, it is necessary to provide a new type of electric appliance control circuit.

Contents of the invention

Aiming at the deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a power-saving control circuit for electrical appliances in standby, and the control circuit consumes less power in the standby state.

In order to solve the problems of the technologies described above, the technical solution of the present invention is achieved in the following way:

A power-saving control circuit for electrical equipment standby, comprising: a rectifier bridge, a filter capacitor, a switching power supply and a first microcontroller, the rectifier bridge is connected to a power supply and is supplied with voltage by an input power supply, and the filter capacitor is connected to the The two ends of the rectifier bridge, the output terminal of the rectifier bridge is connected to the switching power supply, and the switching power supply is respectively connected to the first micro-controller and the load and provides voltage for it, wherein the electrical appliance controller also includes A standby device, the standby device is connected in series between the power supply and the rectifier bridge, and closes or cuts off the circuit between the power supply and the rectifier bridge, and the standby device includes a relay, a drive circuit and a second microcontroller , the relay is connected in series on the circuit between the power supply and the rectifier bridge to close or cut off the circuit, the driving circuit is connected between the relay and the second microcontroller, and the first microcontroller The input terminal of the controller is connected to the output terminal of the second micro-controller, and the second micro-controller controls the relay to open or close when receiving the shutdown or startup command, and simultaneously sends the shutdown or startup command to the the first microcontroller.

As a further improvement of the present invention, the relay is electrically connected to the input power supply and provided with an operating voltage by the input power supply.

As a further improvement of the present invention, the second microcontroller is electrically connected to the input power supply and is provided with an operating voltage by the input power supply.

As a further improvement of the present invention, the standby device further includes an infrared receiving circuit, an output end of the infrared receiving circuit is connected to an input end of the second microcontroller.

As a further improvement of the present invention, the standby device further includes a key control circuit, an output end of the key control circuit is connected to an input end of the second microcontroller.

Compared with the prior art, the power-saving control circuit for electrical standby in the present invention has a standby device connected in series in the power circuit. When the electrical controller is in the standby state, the standby device cuts off the power circuit, and the power circuit cannot power the entire control circuit. power supply, thereby greatly reducing power consumption and reducing energy waste; on the other hand, the infrared receiving circuit or button control circuit on the first microcontroller is canceled, and the first microcontroller is directly controlled by the second microcontroller Control, when the second microcontroller receives the shutdown or startup command, it can not only control the relay to open or close, but also send the shutdown or startup command to the first microcontroller, and the first microcontroller receives the command and controls the corresponding load action ; On the other hand, the operating voltage of the relay and the second micro-control is supplied by the input power supply, without adding an additional power supply battery, and the structure is simple.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 shows the schematic diagram of the principle of the electrical control circuit in the prior art;

FIG. 2 is a schematic diagram of the principle of the power-saving control circuit for electrical appliances in standby in a specific embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

As shown in Figure 2, the power-saving control circuit 20 for electrical appliances in standby is used in electrical appliances such as air conditioners, computers, communication systems, home video, audio systems, etc., and is a device for controlling the operation or stop of the above-mentioned electrical appliances. .

The power-saving control circuit 20 for electrical appliances in standby is powered by an input power supply 21 , and includes a rectifier bridge 22 , a filter capacitor 23 , a switching power supply 24 and a first microcontroller 25 . Wherein, the input power supply 21 is connected with the rectifier bridge 22 and provides voltage therefor, the filter capacitor 23 is connected with the two ends of the rectifier bridge 22, the output end of the rectifier bridge 22 is connected with the switching power supply 24, and the switching power supply 24 is respectively connected with the first micro-controller 25 and load 26 and provide voltage thereto.

The rectifier bridge 22 is a bridge rectifier device composed of several (two or four) rectifier diodes sealed together, and its main function is to convert alternating current into direct current, that is, rectification.

The filter capacitor 23 is an energy storage device installed at both ends of the rectifier circuit to reduce the ripple coefficient of the AC pulsation and improve the high-efficiency and smooth DC output. We call this device a filter capacitor. In all circuits that need to convert alternating current to direct current, setting filter capacitors will make the working performance of electronic circuits more stable, and also reduce the interference of alternating pulsation ripples on electronic circuits. The symbol of the filter capacitor in the circuit is generally represented by "C", the larger the capacitance, the better the filter performance. In order to obtain a better DC stability factor, the capacitance is generally selected to be above hundreds of microfarads or thousands of microfarads.

Switching power supply 24 is a kind of power supply that uses modern power electronic technology to control the time ratio of switching on and off to maintain a stable output voltage. Switching power supply is generally composed of pulse width modulation (PWM) control IC and MOSFET.

The first micro-controller 25 concentrates components such as CPU, ROM, RAM, I/O Interface, timer/counter, and interrupt system on a semiconductor chip to form a complete digital computer. It can be controlled by the controller buttons.

The working principle of the power-saving control circuit 20 for electrical appliances standby is as follows: the input power supply 21 provides 220V AC mains power supply, which is input to the entire electrical appliance controller circuit, and then rectified by the rectifier bridge 22 and filtered by the filter capacitor 23 to form a 310VDC power supply. The voltage, after the switching power supply 24, forms various required DC low voltages (such as 5VDC, 12VDC, 15VDC, etc.) according to needs, and supplies the first microcontroller 25, various driving circuits and low-voltage DC loads 26. In the standby state, the first micro-controller 25 issues an instruction to power off the load 26 .

The power-saving control circuit 20 for electrical appliances to stand by further includes a standby device 27 connected in series between the input power supply 21 and the rectifier bridge 22 . The standby device 27 can close or cut off the circuit between the input power source 21 and the rectifier bridge 22 . When in the standby state, the standby device 27 cuts off the circuit between the input power supply 21 and the rectifier bridge 22. At this time, the input power supply 21 cannot supply power to the entire control circuit, so that the switching power supply 24 and the first microcontroller 25 do not have any energy. loss.

The standby device 27 includes a relay 271 , a driving circuit 272 , a second microcontroller 273 and an infrared receiving circuit 274 . Wherein, the relay 271 is connected in series on the circuit between the input power supply 21 and the rectifier bridge 22, and the relay 271 can close or cut off the circuit; the driving circuit 272 is connected between the relay 271 and the second microcontroller 273 to drive The relay 271 works; the second micro-controller 273 receives the "close" or "open" command and controls the drive circuit 272 to work, the input end of the first micro-controller 25 is connected to the output end of the second micro-controller 273, the second When the microcontroller 273 receives the shutdown or startup command, the control relay 271 is turned off or closed, and at the same time sends the shutdown or startup command to the first microcontroller 25, and the first microcontroller 25 receives the command and controls the action of the corresponding load 26; The output terminal of the infrared receiving circuit 274 is connected to the input terminal of the second micro-controller 273 , which can receive the command of “power on” or “power off” from the remote controller, and transmit the command to the second micro-controller 273 .

The second micro-controller 273 concentrates components such as CPU, ROM, RAM, I/O Interface, timer/counter, and interrupt system on a semiconductor chip to form a complete digital computer. The functions here are to receive shutdown and startup signals, and issue commands to open or close the relay 271 , and transmit the command signals to the first microcontroller 25 at the same time.

The infrared receiving circuit 274 is a circuit module for receiving and decoding the data transmitted by infrared rays that meet the requirements. Infrared rays are electromagnetic waves with a wavelength between 750nm and 1mm. Its frequency is higher than microwaves but lower than visible light. It is a kind of light that cannot be seen by human eyes.

Relay 271 is an automatic control device whose output will change in leaps and bounds when the input (electricity, magnetism, sound, light, heat) reaches a certain value.

The input terminal of the second micro-controller 273 can also be connected to a key control circuit (not shown in the figure), through which the command of “power on” or “power off” can be output to the second micro-controller 273 .

In the first microcontroller 25, an infrared receiving circuit or a button control circuit may not be provided, and the first microcontroller 25 is only controlled by the second microcontroller 273, so in other embodiments, the first microcontroller 25 and the second microcontroller The two microcontrollers 273 can be integrated together to form a controller, which simplifies the circuit structure.

The relay 271 is electrically connected to the input power 21 and is provided with a working voltage by the input power 21 ; the second microcontroller 273 is electrically connected to the input power 21 and is provided with a working voltage by the input power 21 . Since there is no need to add an additional power supply battery, the circuit structure is greatly simplified.

The working principle of the power-saving control circuit 20 for electrical appliances in standby is as follows:

(1) When the control circuit 20 does not receive a power-on command: the relay 271 of the standby device 27 is in an off state, so that the switching power supply 24 and the first microcontroller 25 are powered off without any power consumption;

(2) When shutting down by remote control: after the infrared receiving circuit 274 receives the shutdown signal from the remote controller, the second micro-controller 273 issues an instruction to disconnect the relay 271, and at the same time transmits the shutdown signal to the first micro-controller 25, the second micro-controller 273 A microcontroller 25 controls to cut off the power supply of the load 26;

(3) When shutting down through the controller button: after the second microcontroller 273 receives the shutdown command, the second microcontroller 273 sends an instruction to disconnect the relay 271, and at the same time transmits the shutdown signal to the first microcontroller through serial communication. Controller 25, the first microcontroller 25 controls to cut off the power supply of load 26;

(4) When starting by remote control: when the infrared receiving circuit 274 receives the remote control start signal, the second micro-controller 273 sends an instruction to close the relay 271, and at the same time transmits the start-up command to the first microcontroller 25, the first Microcontroller 25 controls to turn on the power supply of load 26;

In summary, the power-saving control circuit for electrical standby in the present invention is connected in series with a standby device in the power circuit. When the electrical controller is in the standby state, the standby device cuts off the power circuit, and the power circuit cannot supply power to the entire control circuit. Thereby greatly reducing power consumption and reducing energy waste; on the other hand, the infrared receiving circuit or button control circuit on the first microcontroller is canceled, and the first microcontroller is directly controlled by the second microcontroller, When the second microcontroller receives the shutdown or startup command, it can not only control the relay to open or close, but also send the shutdown or startup command to the first microcontroller, and the first microcontroller receives the command and controls the corresponding load action; On the one hand, the working voltage of the relay and the second micro-control is supplied by the input power supply, without adding an additional power supply battery, and the structure is simple.

It will be apparent to those skilled in the art that the invention is not limited to the details of the above-described exemplary embodiments, but that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Accordingly, the embodiments should be regarded in all points of view as exemplary and not restrictive, the scope of the invention being defined by the appended claims rather than the foregoing description, and it is therefore intended that the scope of the invention be defined by the appended claims rather than by the foregoing description. All changes within the meaning and range of equivalents of the elements are embraced in the present invention. Any reference sign in a claim should not be construed as limiting the claim concerned.

In addition, it should be understood that although this specification is described according to implementation modes, not each implementation mode only contains an independent technical solution, and this description in the specification is only for clarity, and those skilled in the art should take the specification as a whole , the technical solutions in the various embodiments can also be properly combined to form other implementations that can be understood by those skilled in the art.

Claims (5)

1. the Saving Power Control Circuit of an electric appliance standby, comprise: rectifier bridge, filter capacitor, Switching Power Supply and the first microcontroller, described rectifier bridge is connected with power supply and for it, provides voltage by input power, described filter capacitor is connected in the two ends of described rectifier bridge, the output terminal of described rectifier bridge is connected with Switching Power Supply, described Switching Power Supply is connected to described the first microcontroller and load and provides voltage for it, it is characterized in that: described appliance controller also comprises apparatus ' of standby, described apparatus ' of standby is connected between described power supply and rectifier bridge, and the circuit between described power supply and rectifier bridge is carried out to closure or cut-out, described apparatus ' of standby comprises relay, driving circuit and the second microcontroller, described relay is connected on the circuit between described power supply and rectifier bridge, so that this circuit is carried out to closure or cut-out, described driving circuit is connected between described relay and the second microcontroller, the input end of described the first microcontroller is connected in the output terminal of described the second microcontroller, described the second microcontroller is when receiving shutdown or start-up command, control described relay disconnection or closed, send shutdown or start-up command to described the first microcontroller simultaneously.

2. the Saving Power Control Circuit of electric appliance standby according to claim 1, is characterized in that, described relay is electrically connected at described input power and provides operating voltage by described input power.

3. the Saving Power Control Circuit of electric appliance standby according to claim 1, is characterized in that, described the second microcontroller is electrically connected at described input power and provides operating voltage by described input power.

4. the Saving Power Control Circuit of electric appliance standby according to claim 1, is characterized in that, described apparatus ' of standby also comprises infrared receiving circuit, and the output terminal of described infrared receiving circuit is connected in the input end of described the second microcontroller.

5. the Saving Power Control Circuit of electric appliance standby according to claim 1, is characterized in that, described apparatus ' of standby also comprises key control circuit, and the output terminal of described key control circuit is connected in the input end of described the second microcontroller.

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