CN201118466Y

CN201118466Y - Power architecture with voltage power adjustment

Info

Publication number: CN201118466Y
Application number: CNU200720181290XU
Authority: CN
Inventors: 宋国全
Original assignee: Xinju Enterprise Co Ltd
Current assignee: Zippy Technology Corp
Priority date: 2007-11-23
Filing date: 2007-11-23
Publication date: 2008-09-17
Anticipated expiration: 2017-11-23

Abstract

The utility model relates to a power supply structure with variable transformation power, which is applied to a power supply with a PFC unit and a transformer; the power supply is also provided with an electric power level correction unit; wherein, the PFC unit determines the level of a voltage transformation electric power and converts the input power into a voltage transformation power which is then converted into an output power through the transformer; the electric power level correction unit allows the output power to pick a load-use power signal and generates a power level correction signal to adjust the voltage transformation power level determined by the PFC unit so as to adjust the voltage transformation power level of the PFC unit, so that the PFC unit can generate voltage transformation power of different voltages along with the load changes to reduce the internal loss of the power supply and improve the disadvantage that the existing power supply can not adjust the internal voltage transformation power and thereby generates the internal loss with the changes of the load.

Description

The power supply structure that possesses modulation transformation electric power

Technical field

The utility model relates to a kind of power supply structure that possesses modulation transformation electric power, is a kind of regulating circuit that is applied to power supply unit.

Background technology

The basic framework of general power supply unit comprises the rectification filtering unit of obtaining input electric power, one power factor correction function unit, one transformer, one adjusts the switch element of this transformer coil electric current, one produces the pulse-width modulation unit of this switch element work period, an one rear end rectification output unit and a back coupling unit, wherein should import electric power through after the rectification and filtering of this rectification filtering unit, boost to the accurate transformation electric power (being generally 380V) that forms in a transformation electric power position by this power factor correction function unit, and be converted to this rear end rectification output unit by this transformer and form an output power and drive a plurality of loads, and this back coupling unit captures a feedback signal and judges that this output power is whether stable in this rear end rectification output unit, and pass this feedback signal back this pulse-width modulation unit and adjust this switch element to change the work period of this transformer power conversion, adjust the output voltage that exports this rear end rectification output unit to thus; Though above-mentioned power supply unit framework is very ripe and widely each dealer use, but wherein this power factor correction function unit is when receiving this input electric power and boost conversion and be a transformation electric power, this transformation electric power position standard is fixed, do not adjust with the load weight, the loss that this kind mode of operation produces when heavy duty is less, yet the transformation electric power that this power factor correction function unit is produced during underloading still maintains identical transformation electric power position standard, then the loss ratio of voltage difference generation will improve, power consumption efficiency is relatively poor when causing underloading, under the situation that power consumption efficiency is required to improve constantly along with various countries, must produce the defective of power consumption efficiency difference when changing the good recipe case and improving above-mentioned underloading.

The utility model content

In view of above-mentioned known power source supply framework causes the bigger defective of underloading loss, of the present utility model primarily promptly being at present provides a kind of circuit framework to make this power supply unit can reduce loss when underloading, reaches the purpose that makes full use of electric power.

Via as can be known above, for achieving the above object, the utility model is a kind of power supply structure that possesses modulation transformation electric power, be applied to have the power factor correction function unit, with the power of transformer supply, and this power supply unit also is provided with the accurate correcting unit in electric power position, wherein this power factor correction function unit decision transformation electric power position is accurate and make that this input power conversions is the transformation electric power that voltage arrives this transformation electric power position standard, make this transformation electric power be converted to output power via this transformer, and this accurate correcting unit in electric power position is to use power signal by acquisition load in this output power, and judge that thus representing load and power output ratio, this accurate correcting unit in electric power position to obtain produces the transformation electric power position standard that the accurate correction signal in electric power position is adjusted this power factor correction function unit decision after power signal is used in this load; Can make this power factor correction function unit have adjustable transformation electric power position standard by above-mentioned circuit framework, make this power supply unit this power factor correction function unit when weight carries produce the transformation electric power of different voltage levels, reduce the internal loss of this power supply unit.

Description of drawings

Fig. 1 is a circuit framework calcspar of the present utility model ().

Fig. 2 is a circuit framework calcspar of the present utility model (two).

Fig. 3 is an enforcement illustration of the present utility model ().

Fig. 4 is an enforcement illustration of the present utility model (two).

Fig. 5 is an enforcement illustration of the present utility model (three).

Embodiment

Relevant detailed description of the present utility model and technology contents now just cooperate schematic view illustrating as follows:

The utility model relates to a kind of power supply structure that possesses modulation transformation electric power; its circuit framework figure sees also Fig. 1; the utility model is applied to obtain an input electric power and have the power supply unit that a transformer 13 these input electric power of conversion form an output power from an electric power source 3; this power supply unit comprises a rectification filtering unit 11; one power factor correction function unit 12; the transformer 13 that connects this power factor correction function unit 12; one rectification output unit 14; one switch element 15; (above is general power supply unit framework commonly used for one a pulse-width modulation unit 16 and an overload protection unit 17; therefore the running of this power supply unit repeats no more); wherein these power factor correction function unit 12 these electric power source 3 of connection obtain this input electric power; and to be provided with a transformation electric power position accurate and should to import power conversions with this transformation electric power position brigadier be the primary side that is sent to this transformer 13 behind the transformation electric power in this power factor correction function unit 12; and the work period that produces these switch elements 15 by this pulse-width modulation unit 16; adjust coil current thus by these transformer 13 primary sides; utilize this transformer 13 with at least one load 2 of this transformation power conversions for this output power drives; use power signal and there is the accurate correcting unit 18 in an electric power position to obtain a load from this output power; this load uses power signal to adjust the electric power that this transformer 13 is converted to secondary side for this pulse-width modulation unit 16; and this overload protection unit 17 of confession judges whether overload and produces this pulse-width modulation unit 16 of an overload protection signal at stop; the accurate correcting unit 18 in this electric power position is obtained this load and is used power signal to determine this bearing power use ratio; and export the accurate correction signal in an electric power position to this power factor correction function unit 12 and adjust this transformation electric power position standard with this transformation electric power of modulation; the transformation electric power that makes power factor correction function unit 12 export transformer 13 to meets the use power ratio of this load 2; can adjust the transformation electric power position standard of this power factor correction function unit 12 when making these load 2 changes; the transformation electric power of these transformer 13 primary sides can change with these load 2 weights, the internal loss when changing to reduce this load 2.

The Organization Chart that the foregoing circuit framework is more detailed sees also Fig. 2, this power factor correction function unit 12 comprises a phase place adjustment loop 121 and a frequency setting loop 122, wherein this frequency setting loop 122 produces a switching frequency, this phase place is adjusted loop 121 and is then changed the boost transformation electric power of these transformer 13 primary sides of formation of this input electric power according to this switching frequency, and the load of this transformer 13 secondary sides acquisition is used power signal to obtain this load by the accurate correcting unit 18 in this electric power position to use power signal to deliver to this frequency setting loop 122 to produce this accurate correction signal in electric power position, adjust the switching frequency that this frequency setting loop 122 produces, change this phase place thus and adjust the transformation voltage of power that loop 121 produces.

In the above-mentioned framework, a plurality of discrete switching frequencies can be set in this frequency setting loop 122, make this phase place adjust loop 121 and form accurate this transformation electric power that produces in a plurality of discrete operating voltages position; See also the embodiment of Fig. 3, the accurate correcting unit 18 in this electric power position can comprise two impedance loops with different resistance values, and connect this impedance loop and be subjected to this load to use power signal to drive and the diverter switch 182 of switching, wherein an end of this diverter switch 182 connects a voltage source 181, these diverter switch 182 other ends are connected in a wherein impedance in this impedance loop, the electric power that this voltage source 181 produces is through forming the frequency setting loop 122 that this accurate correction signal in electric power position is sent to this power factor correction function unit 12 behind this impedance loop, and this diverter switch 182 is subjected to this load to use the driving of power signal, then this diverter switch 182 is switched another impedance that connects these impedance loops when this load uses power signal to arrive a default potential reference value, make this accurate correction signal in electric power position produce a nonlinear change, and then the switching frequency that changes this frequency setting loop 122 produce discrete variation; Another embodiment sees also Fig. 4, the accurate correcting unit 18 in this electric power position can comprise a plurality of impedance loops with different resistance values, and be subjected to this load to use power signal to drive and switch on the diverter switch 182 of the multistage in a plurality of impedances loop, form the accurate correction signal in nonlinear electric power position because this diverter switch 182 cooperates this voltage source 181 and switches the impedance loop that connects a plurality of different resistance values, and then make this frequency setting loop 122 produce the transformation electric power that a plurality of discrete switching frequencies are adjusted these transformer 13 primary sides.

An embodiment more of the present utility model sees also Fig. 5, the accurate correcting unit 18 in this electric power position can be an amplifier circuit 183, this amplifier circuit 183 is obtained and is delivered to this frequency setting loop 122 according to the accurate correction signal in electric power position that yield value produces and this load uses power signal to form a special ratios of this amplifier circuit 183 after power signal is used in this load, and because the accurate correction signal in electric power position that this amplifier circuit 183 produces is a linear signal, make this frequency setting loop 122 can produce a continuous switching frequency and change, make this operating voltage can be linear change for the operating voltage of adjusting these transformer 13 primary sides.

Though the utility model as above discloses with preferred embodiment; but it is not to be used for limiting the utility model; any those skilled in the art; in not breaking away from spirit and scope of the present utility model; a little change and the retouching done; all should be covered by in the utility model, therefore protection range of the present utility model is as the criterion when looking accompanying the claim person of defining.

Claims

1. a power supply structure that possesses modulation transformation electric power is obtained input electric power and is changed described input electric power to produce the power supply unit that output power drives at least one load (2) for connecting electric power source (3), it is characterized in that, comprises in the described power supply unit:

Power factor correction function unit (12) connects described electric power source (3), and described power factor correction function unit (12) is provided with transformation electric power position standard, is transformation electric power with the described input power conversions of described transformation electric power position brigadier;

Transformer (13), described transformer (13) primary side connects described power factor correction function unit (12), and described transformer (13) is obtained described transformation electric power and is converted to output power;

The accurate correcting unit in electric power position (18), connect described transformer (13) secondary side and drive the output power of described load (2) to obtain load use power signal, and the accurate correcting unit in described electric power position (1 8) uses power signal to determine described bearing power use ratio with described load and the accurate correction signal in output power position is adjusted described transformation electric power position standard with the described transformation electric power of modulation to described power factor correction function unit (12), and the transformation electric power that makes power factor correction function unit (12) export transformer (13) to meets the use power ratio of described load (2).

2. the power supply structure that possesses modulation transformation electric power according to claim 1, it is characterized in that, described power factor correction function unit (12) has the frequency setting loop (122) that produces switching frequency and changes described input electric power and the phase place that forms described transformation electric power is adjusted loop (121) according to described switching frequency, and the accurate correction signal in the accurate correcting unit in described electric power position (18) output described electric power position to described frequency setting loop (122) to adjust described switching frequency.

3. the power supply structure that possesses modulation transformation electric power according to claim 2 is characterized in that, a plurality of discrete switching frequencies are set for adjustment in described frequency setting loop (122).

4. the power supply structure that possesses modulation transformation electric power according to claim 3, it is characterized in that, the accurate correcting unit in described electric power position (18) comprises a plurality of have the impedance loop of different resistance values and the diverter switches (182) of multistage, one end of the diverter switch of described multistage (182) connects voltage source (181) and the other end switches and is connected in a plurality of impedances loop, and the diverter switch of described multistage (182) is subjected to described load to use power signal to drive and switch on a plurality of impedances loop.

5. the power supply structure that possesses modulation transformation electric power according to claim 2, it is characterized in that, the accurate correcting unit in described electric power position (18) has amplifier circuit (183) and obtains described load use power signal, and the accurate correction signal in electric power position of generation and described load use power signal formation special ratios.