CN201374652Y

CN201374652Y - Energy-saving switching power supply

Info

Publication number: CN201374652Y
Application number: CN200920005777U
Authority: CN
Inventors: 王立平
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-03-11
Filing date: 2009-03-11
Publication date: 2009-12-30
Anticipated expiration: 2019-03-11

Abstract

The utility model relates to an energy-saving switching power supply which comprises an input rectification filter circuit connected with an AC input, a high-frequency converter circuit and a high frequency transformer in cascade connection, and an output rectification filter circuit with DC output. The switching power supply further comprises a loop disconnecting switch circuit and a load state detection control circuit, wherein the loop disconnecting switch circuit is in cascade connection between the input rectification filter circuit and the high-frequency converter circuit; and the load state detection control circuit is connected between the output rectification filter circuit and the loop disconnecting switch circuit. The switching power supply has the beneficial effect that the loop disconnecting switch circuit and the load state detection control circuit which is formed by a current sampling circuit and an MCU are additionally arranged in the main circuit of the switching power supply, so that when the entire switching power supply is in a working state, the load state detection control circuit in the switching power supply controls the loop disconnecting switch circuit to cut off the power supply internal loop while sensing that the load is not work, thereby ensuring no power consumption and achieving energy-saving and environmental-protection purposes.

Description

Energy-saving Switching Power Supply

[technical field]

The utility model relates to a kind of Switching Power Supply, but refer in particular to a kind of when non-loaded the energy-saving Switching Power Supply of automatically cutting off power source home loop to cut down the consumption of energy.

[background technology]

Existing Switching Power Supply is the charger etc. of each electronic product for example, in case during use in the Switching Power Supply incoming transport source, no matter whether it links to each other with load or whether the load that connects works, the converter of its internal circuit, transformer etc. all can remain on operating state always, and Switching Power Supply thereby the most of the time all passes into silence and is consuming electric energy under the no-load condition, unfavorable environmental protection and energy saving being on the socket in actual use.For this reason, ground such as the U.S., Europe had proposed higher energy conservation standard to power supply product in the last few years, require the unloaded standby energy consumption of all kinds of Switching Power Supplies must be lower than 1W or lower, the energy consumption when how further effectively reducing the inoperative of power supply becomes the problem of needing solution in the industry badly.

[summary of the invention]

The purpose of this utility model is to have overcome above-mentioned defective, provides a kind of and can detect the also energy-saving Switching Power Supply of intelligent control cut-out Switching Power Supply internal work loop reduction standby energy consumption to connecing load condition.

The purpose of this utility model is achieved in that a kind of energy-saving Switching Power Supply, it comprises the input rectifying filter circuit that connects the interchange input, the output rectifier and filter of the high frequency conversion circuit of cascade, high frequency transformer and direct current output, its improvements are: it comprises that also the loop cuts off switching circuit and load condition detects control circuit; Described loop cuts off the switching circuit level and is coupled between input rectifying filter circuit and the high frequency conversion circuit; Described load condition detects control circuit and is connected between output rectifier and filter and the loop cut-out switching circuit;

Described load condition detects control circuit and includes the current sampling circuit that connects output rectifier and filter and export the MCU that link circuit cuts off switching circuit;

Described loop cut-out switching circuit is also imported and is connected with start triggering circuit and high frequency transformer, and the start triggering circuit input connects the input rectifying filter circuit;

Described loop cuts off switching circuit and is made up of the separating thyristor circuit that switch mosfet pipe and two triodes constitute.

Than common Switching Power Supply, the beneficial effects of the utility model are additionally to be provided with a loop and cut off switching circuit in the main circuit of Switching Power Supply, and corresponding setting can be cut off the load condition detection control circuit of switching circuit according to the load condition control loop, load condition detects control circuit and judges control by load current sampling back by MCU, and consider the convenience of the manual recovery after internal circuit automatically cuts off, loop cut-out switching circuit is also imported and is connected with start triggering circuit, thus one, whole Switching Power Supply is when work, when load is not worked, its internal burden state-detection control circuit promptly can perception and control loop cut off the switching circuit home loop of cutting off the electricity supply, reach the purpose of turn-offing home loop, restart as the need power supply, the manual operation start triggering circuit gets final product, and at the loop blocking interval, the loop behind the input rectifying filter circuit disconnects fully, inner each circuit of power supply is consumed energy no longer all, reaches the purpose of real energy-conserving and environment-protective.

[description of drawings]

Below in conjunction with accompanying drawing in detail concrete structure of the present utility model is described in detail

Fig. 1 is circuit theory diagrams of the present utility model.

Fig. 2 is the specific embodiment of the utility model circuit theory diagrams.

Fig. 3 is the specific embodiment of the utility model circuit diagram.

[embodiment]

Below in conjunction with accompanying drawing the utility model specific embodiment is described in detail.

As shown in Figure 1, the utility model relates to a kind of energy-saving Switching Power Supply, it is successively by the input rectifying filter circuit of cascade, the loop cuts off switching circuit, the high frequency conversion circuit, high frequency transformer and output rectifier and filter constitute, input rectifying filter circuit wherein is used for incoming transport input power supply, and output rectifier and filter directly connects load and carries out direct current output, between output rectifier and filter and loop cut-out switching circuit, also be provided with a load condition and detect control circuit, load condition detects the output situation of control circuit by the sampling load that connects in the output rectifier and filter, and feedback control loop cuts off closing of switching circuit, thereby makes in cutting off the electricity supply automatically during non-loaded access in power circuit circuit stop the purpose of its work.

Specific embodiment schematic diagram referring to Fig. 2, load condition in the present embodiment detects control circuit and is made of current sampling circuit and MCU, current sampling circuit connects the current signal of sampling from output rectifier and filter, judge the break-make of the loop electronics commutation circuit that back control links to each other then by MCU, and loop electronics commutation circuit also links to each other with high frequency transformer, high frequency transformer one tap is connected to the loop and cuts off the switching circuit power supply, and can be turned off thoroughly elimination energy consumption of back in home loop, present embodiment also is provided with outside start triggering circuit in addition, start triggering circuit is arranged at input rectifying filter circuit and loop and cuts off between the switching circuit, is used to allow extraneous manual recovery operation after the power supply internal circuit cuts off automatically.

Referring to Fig. 3 is the specific embodiment circuit diagram of corresponding diagram 2 schematic diagrams, exchanging input is imported by upper left corner joint J1, then to after the heap D1 rectification of passing a bridge again by electrochemical capacitor EC1, EC2 carries out filtering to it, thereby finish input rectifying filtering, one tunnel R16, R17 and the starting switch S1 that is connected to the start triggering circuit of lower-left end then is connected into high frequency transformer T1 behind the high frequency conversion circuit that another road input is made up of metal-oxide-semiconductor Q1 and control chip U1.Press starting switch S1, the loop cuts off the Q2 conducting of switching circuit, the high frequency conversion circuit is started working, the boost voltage that the auxiliary winding 3 ~ 4 of transformer T1 produces is kept the Q2 conducting, 5 ~ 6 of transformer T1 forms secondary output, thereby the diode D3 by output rectifier and filter and electrochemical capacitor EC3, EC4, EC5 formations+5V direct current are exported and can directly be supplied with the connection load.In order to detect the working condition of load in real time, between output pin and ground, add a little value resistance R 5, and draw ADC1 in resistance R 5 ends and be connected in the input pin 10 of MCU U5, obtain the current signal of loaded work piece situation thereby make MCU to sample, in case load quits work, MCU promptly can perception and is exported a control signal SHUT by 2 pin, cut off switching circuit via control loop behind the photoelectrical coupler U6 and turn-off home loop, described loop cuts off switching circuit and is made up of the separating thyristor circuit that a high-voltage MOSFET switching tube and two triodes of employing constitute, in case the separating thyristor circuit receives that promptly can introduce metal-oxide-semiconductor Q2 from the closing control signal of MCU turn-offs, to cut off the high frequency conversion circuit, reach the purpose of turn-offing home loop, and all consumed energies no longer of inner each circuit of having no progeny are closed in the loop, reach the purpose of real energy-conserving and environment-protective.

It is to be noted; the utility model is not limited to above-mentioned execution mode; any simple modification, equivalent variations and modification that any those skilled in the art do the foregoing description in based on technical solutions of the utility model all belong in the protection range of the present utility model.

Claims

1, a kind of energy-saving Switching Power Supply, it comprises the input rectifying filter circuit that connects the interchange input, the output rectifier and filter of the high frequency conversion circuit of cascade, high frequency transformer and direct current output is characterized in that: it comprises that also the loop cuts off switching circuit and load condition detects control circuit; Described loop cuts off the switching circuit level and is coupled between input rectifying filter circuit and the high frequency conversion circuit; Described load condition detects control circuit and is connected between output rectifier and filter and the loop cut-out switching circuit.

2, energy-saving Switching Power Supply as claimed in claim 1 is characterized in that: described load condition detects control circuit and includes the current sampling circuit that connects output rectifier and filter and export the MCU that link circuit cuts off switching circuit.

3, energy-saving Switching Power Supply as claimed in claim 1 is characterized in that: described loop cut-out switching circuit is also imported and is connected with start triggering circuit and high frequency transformer, and the start triggering circuit input connects the input rectifying filter circuit.

4, energy-saving Switching Power Supply as claimed in claim 3 is characterized in that: described loop cuts off switching circuit and also imports the connection high frequency transformer.

5, energy-saving Switching Power Supply as claimed in claim 4 is characterized in that: described loop cuts off switching circuit and is made up of the separating thyristor circuit that switch mosfet pipe and two triodes constitute.