CN207164696U - A kind of low-power dissipation power supply - Google Patents

Abstract

The utility model discloses a kind of low-power dissipation power supply, including resistance R₁, resistance R₂, capacitor C₁With capacitor C₂Characterized in that, also include detecting system, optocoupler U₄, integrated circuit U₁With triode Q₁.The utility model can automatic identification product power supply whether normally charging, when product is fully charged, detecting system is capable of detecting when, and timely closes output, when product not enough power supply, when connecting with the mains can detecting system identify and open the output of electricity and charged, when not pulling out the connection of power supply and socket, the power consumption of power supply itself is reduced, realizes the low-power consumption of power supply, the no-load power when product is fully charged is reduced, saves energy.

Description

A low-power power supply

technical field

The utility model relates to the technical field of power supplies, in particular to a low-power consumption power supply.

Background technique

At present, the field of power supply usually adopts: AC input (AC) and DC input (DC). DC/DC conversion to direct current (DC) output.

The power supply itself has no AC switch and can only be disconnected by unplugging the power supply. These products need to be manually turned on or connected to the power supply. There are three ways for the user to shut down the mobile phone and other electronic products after using them. The first way is to unplug the plug connecting the power supply and electricity, the second way is to unplug the plug connecting the power supply and the mobile phone, and the third way is to shut down Do nothing afterwards. The first method has no power loss, but because the power supply and the electrical connection socket are generally hidden, it is inconvenient to operate, so many people do not operate in this way. In the second way, the power supply is in the no-load state, and the no-load power consumption is generally about 500mW, and the current power supply is about 300mW. In the third way, the standby power consumption is above 1W. The second and third modes of operation have brought energy waste, which are incompatible with the concept of energy conservation and environmental protection advocated by today's society.

In the design of power supply, low power consumption design is a problem that many designers must solve. The reason is that some products need sufficient power supply, but some products do not get sufficient power supply and rely on battery power supply, so reducing the Power consumption has become a growing concern.

Utility model content

In order to solve the above-mentioned problems, the utility model provides a low-power power supply, including resistor R ₁ , resistor R ₂ , capacitor C ₁ and capacitor C ₂ , characterized in that it also includes a detection system, an optocoupler U ₄ , an integrated circuit U ₁ and transistor Q ₁ , the detection system is connected to pin 1 of the optocoupler U ₄ through the positive pole of the power supply, pin 2 of the optocoupler U ₄ is connected to the negative pole of the power supply, and pin 4 of the optocoupler U ₄ is connected to a resistor R ₂ , the resistor R ₁ is connected to pin 8 of the integrated circuit U ₁ , the collector of the transistor Q ₁ is connected to pin 1 of the integrated circuit U ₁ , and the pin 8 of the U ₁ is connected to the optocoupler through R ₂ 4 pins of U ₄ .

Further, pin ₅ of the integrated circuit U1 is connected to the emitter _of the transistor Q1.

Further, pin ₂ of the integrated circuit U1 is for voltage feedback, and pin ₃ of the integrated circuit U1 is for current feedback.

Further, it is characterized in that the model of the optocoupler U ₄ is PC817B.

Further, the model _of the integrated circuit U1 is UC3842.

The beneficial effects of the utility model are:

It can automatically identify whether the power supply of the product is charging normally. When the product is fully charged, the detection system can detect it and turn off the output in time. When the product is low in power, the detection system can recognize and turn on the power output when the power is connected. Charging, when the connection between the power supply and the socket is not unplugged, the power consumption of the power supply itself is reduced, the low power consumption of the power supply is realized, the no-load power when the product is fully charged is reduced, and energy is saved.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

The utility model provides a low power consumption power supply, which includes resistor R ₁ , resistor R ₂ , capacitor C ₁ and capacitor C ₂ , and is characterized in that it also includes a detection system, an optocoupler U ₄ , an integrated circuit U ₁ and a triode Q ₁ , the detection system is connected to pin 1 of optocoupler U ₄ through the positive pole of the power supply, pin 2 of the optocoupler U ₄ is connected to the negative pole of the power supply, pin 4 of the optocoupler U ₄ is connected to resistor R ₂ , and the resistor R1 is connected to pin ₈ of the integrated circuit U1, the collector _of the transistor Q1 is connected to pin ₁ of the integrated circuit U1, and pin ₈ of the U1 is connected to pin ₄ of the optocoupler _U4 through R2 _.

Pin ₅ of the integrated circuit U1 is connected to the emitter of the triode Q1, pin ₂ of the integrated circuit U1 is for voltage feedback, and pin _{3 of} the integrated circuit U1 is for current feedback, and it is characterized in that the The model of the optocoupler U ₄ is PC817B, and the model of the integrated circuit U ₁ is UC3842.

When the battery is connected correctly, there is a voltage between pin 1 and pin 2 of the optocoupler _U4 , and the voltage is positive, pin 3 and pin ₄ of the optocoupler U4 are turned on, and the base of the transistor Q1 is pulled to _a low potential. Transistor Q ₁ is cut off, the collector of triode Q ₁ is at high level, pin 1 of integrated circuit U ₁ is at high level, and the integrated circuit is turned on accordingly, at this time, it can be charged normally.

When the product is fully charged, the current detection system detects that the current value is less than the set value. At this time, the voltage of pin 1 and pin 2 of the optocoupler is 0, the pin 3 and pin 4 of the optocoupler are cut off, and the base of the triode is pulled down. High level, the triode is turned on, the collector of the triode is low level, and pin 1 of the integrated circuit is low level, then the integrated circuit will turn off the output.

When the battery is not connected, the voltage between pin 1 and pin 2 of the optocoupler is 0, pin 3 and pin 4 of the optocoupler are cut off, resistor R ₂ and pin 8 connected to the integrated circuit are at high level, and the base of the triode Pulled high level by resistor R2, the triode is turned _on , the collector of the triode is low level, and the integrated circuit will also turn off the output.

When the power supply is connected, it can be detected by the system to identify and turn on the output of the power for charging. When the connection between the power supply and the socket is not unplugged, the power consumption of the power supply itself is reduced, and the low power consumption of the power supply is realized. No-load power when the product is fully charged, saving energy.

The basic principles and main features of the present utility model have been described above. Those skilled in the art should understand that the present utility model is not limited by the above-mentioned embodiments. What are described in the above-mentioned embodiments and description are only to illustrate the principles of the present utility model. Under the premise of departing from the spirit and scope of the present utility model, the present utility model also has various changes and improvements, and these changes and improvements all fall within the scope of the claimed utility model, and the scope of protection of the utility model is defined by the appended claims book and its equivalents.

Claims (5)

1. a kind of low-power dissipation power supply, including resistance R₁, resistance R₂, capacitor C₁With capacitor C₂, it is characterised in that also include detection System, optocoupler U₄, integrated circuit U₁With triode Q₁, the detecting system passes through positive source and optocoupler U₄1 pin be connected, institute State optocoupler U₄2 pin be connected with power cathode, the optocoupler U₄4 pin be connected to resistance R₂, the resistance R₁It is connected to integrated electricity Road U₁8 pin, the triode Q₁Colelctor electrode be connected to integrated circuit U₁1 pin, the U₁8 pin pass through R₂It is connected to optocoupler U₄4 pin.

A kind of 2. low-power dissipation power supply according to claim 1, it is characterised in that the integrated circuit U₁5 pin be connected to three Pole pipe Q₁Emitter stage.

A kind of 3. low-power dissipation power supply according to claim 1, it is characterised in that the integrated circuit U₁2 pin for voltage it is anti- Feedback, the integrated circuit U₁3 pin be current feedback.

A kind of 4. low-power dissipation power supply according to claim 1, it is characterised in that the optocoupler U₄Model PC817B.

A kind of 5. low-power dissipation power supply according to claim 1, it is characterised in that the integrated circuit U₁Model UC3842。