CN2744091Y

CN2744091Y - Low stand-by power consumption power circuit

Info

Publication number: CN2744091Y
Application number: CN 200420098048
Authority: CN
Inventors: 姚戈; 辛晓光; 董波
Original assignee: Hisense Group Co Ltd; Qingdao Hisense Electronics Co Ltd
Current assignee: Hisense Group Co Ltd; Qingdao Hisense Electronics Co Ltd
Priority date: 2004-12-03
Filing date: 2004-12-03
Publication date: 2005-11-30
Anticipated expiration: 2014-12-03

Abstract

The utility model discloses a low stand-by power consumption power circuit, comprising a switch transformer and a CPU. The one-path output terminal of the switch transformer is connected with a power supply switching circuit. The control end of the power supply switching circuit is connected with the I/O port of the CPU and the output end of the power supply switching circuit is connected with the power supply end of the CPU. The characteristic is realized that the output end of the switch transformer is cutoff once the power circuit is normal working and the reference voltage output end of the switch transformer is still maintaining a definite voltage output in stand-by. The voltage is converted into supply voltage to supply power for CPU, in this way, the utility model plays a role of secondary power supply. The utility model is simple in structure and low in cost. In addition, the stand-by power consumption of the utility model is less than 1W. So the energy-saving effect is improved and the competitiveness of the product is enhanced.

Description

The low standby power loss power circuit

Technical field

The utility model relates to a kind of improvement of TV set circuit, specifically, relates to a kind ofly when the television set standby, reduces the power circuit of its power loss.

Background technology

In the past, the television set power consumption was all more than 9W when standby for power circuit in most of television set, and waste of energy is more serious.Be energy savings, promote whole TV industry and improve energy-saving design, country has released the green power supply authentication system, stand-by power consumption to all television sets adopts forcible authentication, require stand-by power consumption simultaneously, to carry out energy-saving design less than 9W in order to encourage complete machine manufacturer, to the type of stand-by power consumption, will allow on this type, to mark energy-saving sign less than 3W.For realizing the purpose of standby low-power consumption, present most of power circuit all adopts two power supply of cover power supply, i.e. main power source and auxiliary powers.When standby, main power source cuts out, and can keep normal reception instruction for guaranteeing cpu chip, must have power supply to give chip power supply, thus come power supply by enabling another set of auxiliary power to CPU, thus the purpose of reduction power consumption when reaching standby.But meanwhile, adopt the circuit design of major and minor power supply to make the power system structure complexity, reliability reduces, and cost increases, and is unfavorable for using widely and promoting.

Summary of the invention

For the circuit design that solves the major and minor power supply of available technology adopting reduces the low problem of circuit structure complexity, reliability that the machine stand-by power consumption is brought, the utility model provides a kind of novel low power consumption standby power supply circuit, this circuit is on the basis that does not increase auxiliary power, by the simple power supply switch circuit of configuration in main power circuit, realized the purpose of low standby power loss, simplify circuit structure, reduced production cost.

For solving the problems of the technologies described above, the utility model is achieved by the following technical programs:

A kind of low standby power loss power circuit, comprise switch transformer and CPU, road output at described switch transformer is connected with a power supply switch circuit, the control end of described power supply switch circuit links to each other with the I/O mouth of CPU, output links to each other with the power supply side of CPU, realize that described transformer output ends when the power circuit operate as normal, output dc voltage during standby is for CPU provides the power supply power supply.

As a preferred embodiment of the present utility model, described power supply switch circuit includes a NPN type triode and a positive-negative-positive triode, the base stage of described NPN type triode links to each other with the I/O mouth of CPU, and collector electrode links to each other grounded emitter with the base stage of described positive-negative-positive triode; The collector electrode of described positive-negative-positive triode links to each other with the power supply side of CPU, and emitter links to each other with the output of described switch transformer through divider resistance.

As the further qualification to above-mentioned embodiment, the output of described switch transformer links to each other with the positive pole of a rectifier diode, and negative pole links to each other with described power supply switch circuit on the one hand, on the other hand through a filter capacitor ground connection.

Compared with prior art, advantage of the present utility model and good effect are: the utility model is by setting up power supply switch circuit in existing power circuit, when the power supply standby, utilize the reference voltage output end of switch transformer still can keep the characteristics of certain voltage output, with this voltage transitions is that supply voltage is the CPU power supply, reaches the effect of auxiliary power.This circuit structure is simple, and is with low cost, and stand-by power consumption can reach below the 1W, has greatly improved energy-saving effect, has strengthened competitiveness of product.

Description of drawings

Fig. 1 is the concrete circuit connection diagram of the utility model low standby power loss power circuit.

Embodiment

The utility model is described in more detail below in conjunction with the drawings and specific embodiments.

Fig. 1 is the physical circuit figure of the utility model low standby power loss power supply.Among the figure, 11 pin at switch transformer T801 are connected with a power supply switch circuit, described switching circuit includes a NPN type triode V804 and a positive-negative-positive triode V802, the base stage of described NPN type triode V804 links to each other with the I/O mouth of CPU, receive the high-low level control signal STB that CPU sends, collector electrode links to each other grounded emitter through resistance R 817 with the base stage of described positive-negative-positive triode V802; The collector electrode of described positive-negative-positive triode V802 links to each other with the power supply side of CPU, and emitter links to each other with 11 pin of described switch transformer T801 through divider resistance R818, diode VD812.In addition, the negative pole of described diode VD812 is through filter capacitor C818 ground connection.

When the power supply standby, the front end voltage of switch transformer T801 reduces, and each road output voltage of transformer T801 is all descended.The 10th pin of switch transformer T801 is the reference voltage output pin, output reference voltage, promptly+B voltage.Described+B voltage when the power supply operate as normal, generally maintain+130V about, during standby, still can remain on about 16V.These characteristics of the utility model utilization+B voltage when switch transformer T801 makes, make its 11 pin and 10 pin output homophase winding, and the 10 pin output voltages of switch transformer T801 are+B voltage, so 11 pin output voltages also are+B voltage.When the power supply standby, + B voltage drops to 16V, the 11 pin output voltages of switch transformer T801 also drop to 16V, at this moment, the I/O mouth of CPU output high level STB control signal makes triode V804 conducting, and then control triode V802 conducting, the 11 pin output voltages of switch transformer T801 for CPU provides+power supply of 9V power supply, are kept its operate as normal through triode V802 after divider resistance R818 step-down.When the power supply operate as normal, the I/O mouth output low level STB control signal of CPU is ended triode V804, and then control triode V802 ends, + B voltage returns to+130V, and the output of 11 pin of switch transformer T801 is in cut-off state, not interference power operate as normal.At this moment, the required power supply of CPU is provided by the output voltage of switch transformer T801 the 13rd pin.

The utility model on the basis that does not increase auxiliary power, has been realized the purpose of power supply standby low-power consumption by adopting above simple circuit configuration, can be widely used in the different power circuits.Certainly; above-mentioned explanation is not to be to restriction of the present utility model; the utility model also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present utility model also should belong to protection range of the present utility model.

Claims

1. low standby power loss power circuit, comprise switch transformer and CPU, it is characterized in that: road output at described switch transformer is connected with a power supply switch circuit, the control end of described power supply switch circuit links to each other with the I/O mouth of CPU, output links to each other with the power supply side of CPU, realize that described transformer output ends when the power circuit operate as normal, output dc voltage when standby is for CPU provides the power supply power supply.

2. low standby power loss power circuit according to claim 1, it is characterized in that: described power supply switch circuit includes a NPN type triode and a positive-negative-positive triode, the base stage of described NPN type triode links to each other with the I/O mouth of CPU, collector electrode links to each other grounded emitter with the base stage of described positive-negative-positive triode; The collector electrode of described positive-negative-positive triode links to each other with the power supply side of CPU, and emitter links to each other with the output of described switch transformer through divider resistance.

3. low standby power loss power circuit according to claim 2 is characterized in that: the output voltage of the output of described switch transformer is identical with the reference voltage of transformer.

4. low standby power loss power circuit according to claim 3 is characterized in that: the output of described switch transformer links to each other with the positive pole of a rectifier diode, and negative pole links to each other with described power supply switch circuit on the one hand, on the other hand through a filter capacitor ground connection.