CN202663312U

CN202663312U - Micro switch power supply apparatus

Info

Publication number: CN202663312U
Application number: CN 201120557620
Authority: CN
Inventors: 王存才
Original assignee: ZHUHAI PILOT TECHNOLOGY Co Ltd
Current assignee: ZHUHAI PILOT TECHNOLOGY Co Ltd
Priority date: 2011-12-27
Filing date: 2011-12-27
Publication date: 2013-01-09
Anticipated expiration: 2021-12-27

Abstract

The utility model discloses a micro switch power supply apparatus. The micro switch power supply apparatus comprises a rectifier module and a feedback module, wherein the rectifier module has an input terminal, a first output terminal and a feedback terminal, alternating current is inputted from the input terminal and outputted through a power supply terminal of the first output terminal and a first GND terminal after being converted to direct current, the feedback module feedbacks the direct current to the feedback terminal of the rectifier module, the rectifier module adjusts output according to a feedback signal inputted by the feedback terminal, the feedback module comprises a switch element which has a control terminal, the control terminal is connected with the first output terminal, and the switch element opens/closes output of the rectifier module according to the signal of the control terminal. Compared with the prior art, the switch power supply apparatus outputs constant voltage, employs a small number of electronic components and realizes miniaturization of the switch power supply apparatus.

Description

The mini-switch power source device

Technical field

The utility model relates to a kind of Switching Power Supply, and especially a kind of volume is little, performance highland mini-switch power source device.

Background technology

The compact power supply module is widely used in industrial production and sphere of life.Many electronic products all need low-voltage dc power supply, especially in electronic instrument, more need a kind of miniaturization, high performance small low-voltage DC power supply.The Switching Power Supply of using in the market uses components and parts more, not only cause volume large, and its sealing property is not strong yet.

Chinese patent 02813189.5 discloses a kind of switching type power supply, and it comprises a metal level and ceramic substrate, and some semiconductor device are installed on the ceramic substrate by lead-free solder.In order to improve the heat dispersion of power module, whole power supply module is installed on the heat radiation plate.Although this Switching Power Supply volume is smaller, its manufacturing cost is high, and the electronic component of use is numerous.And for fear of because the variation of high temperature load causes slight crack at ceramic substrate, therefore in use the semiconductor element that damages is checked or must be under 220 degree high temperature when changing a large amount of time of cost safeguard.

The utility model content

For the deficiencies in the prior art, the purpose of this utility model is that a kind of few small-sized, high performance mini-switch power source device of element that uses will be provided.

For achieving the above object, the technical scheme of mini-switch power source device employing described in the utility model is as follows:

A kind of mini-switch power source device, comprise a rectification module and a feedback module, described rectification module has an input, the first output and feedback end, alternating current is from this input input, export from this first output after being converted to direct current, described feedback module comprises a switch element, described switch element has a control end, this control end is connected with described the first output, with the described rectification module of the signal back of the first output, described rectification module is adjusted output voltage according to the feedback signal that feedback end receives to switch element according to the signal of control end.

Concrete, described feedback module also comprises the first resistance and the second resistance that is serially connected between the first output, the control end of described switching tube is connected between this first resistance and the second resistance.

Further, also comprise an optoelectronic switch, described switch element is a thyristor, and this thyristor is controlled the On/Off of this optoelectronic switch according to the feedback signal of control end, and the output signal of the first output is fed back to described rectification module.

Preferably, described rectification module comprises a rectifier bridge, a transformer and a power management chip, the input input AC electricity of described rectifier bridge, and output one end is connected to an end on the former limit of transformer, and an other end is connected to power management chip; The first secondary of transformer is connected to the first output, output DC; The output of power management chip is connected with an other end of transformer primary side, and power management chip is according to the output of feedback signal and internal reference regulation output end.

Further, also be provided with one second output, be provided with one second secondary in the described transformer, the direct current of the second output output is exported after a power supply chip voltage stabilizing.

Further, also comprise an input filter module, described input filter module comprises one first electric capacity, filter inductance, the second electric capacity and the 3rd electric capacity, described the first electric capacity is connected between two inputs of this filter inductance, two inputs of described filter inductance are connected to the input of described rectifier bridge, described the second electric capacity and the 3rd electric capacity be connected in series respectively and two outputs and the earth of this filter inductance between.

Further, also comprise an output filtering module, described output filtering module comprises that one is serially connected in the 4th electric capacity and the first inductance and the 5th electric capacity that is connected in series between described the first output, described the 4th electric capacity and described the first inductance that is connected in series and the 5th Capacitance parallel connection.

Preferably, also comprise one the 6th electric capacity, described the 6th capacitance series is between described the second output.

Further, described the 4th electric capacity, the second electric capacity and the 6th electric capacity are solid capacitor.

With respect to prior art, switching power unit described in the utility model carries out the stability that sampling feedback is adjusted the supply unit output voltage with feedback module to output voltage, the quantity of the electronic component that has also reduced when having improved the performance of supply unit; And filter capacitor of the present utility model adopts solid capacitor, has also further reduced the volume of supply unit.

In order to understand fully the purpose of this utility model, feature and effect, be described further below with reference to the technique effect of accompanying drawing to design of the present utility model, concrete structure and generation.

Description of drawings

Fig. 1 is the structural representation of switching power unit described in the utility model;

Fig. 2 is the circuit diagram of switching power unit described in the utility model.

Fig. 2 a is the circuit diagram of input filter module among Fig. 2;

Fig. 2 b is the circuit diagram of rectification module among Fig. 2;

Fig. 2 c is the circuit diagram of feedback module and output filtering module among Fig. 2;

Fig. 2 d is the circuit diagram of power supply chip among Fig. 2.

Among the figure:

The 1-rectification module; The 11-input; 12-the second output; The 121-power supply chip; 13 first outputs; 131-output filtering module; The 14-feedback end; The 2-feedback module; 3-input filter module.

Embodiment

As depicted in figs. 1 and 2, a kind of mini-switch power source device comprises a rectification module 1 and feedback module 2.Rectification module 1 has input 11, the first output 13 and feedback end 14, input 11 input High Level AC Voltages, and the first output 13 output low-voltage DCs, feedback end 14 receives the galvanic sampled signal of 2 pairs of outputs of feedback module, 11 outputs.Rectification module 1 can receive to such an extent that signal is adjusted output according to feedback end 14.

See also Fig. 2 and Fig. 2 c, feedback module 2 comprises a switch element, the first resistance R 7 and the second resistance R 9, and as preferred embodiment a kind of, switch element can be a thyristor U3, thyristor U3 has a control end, and this control end is connected with the first output 13 of rectification module 1.In order to reduce the voltage of control end, the first resistance R 7 and the second resistance 9 can be serially connected between output and the GND, control end is connected between the first resistance R 7 and the second resistance R 9.Therefore the voltage of control end is the dividing potential drop of the first resistance R 7 and the second resistance R 9.In order to prevent feedback signal for the impact of rectification module 1, also be provided with an optoelectronic switch U1 between feedback module 2 and the rectification module 1 and carry out the photoelectricity isolation.See also Fig. 2 c, thyristor U3 feeds back in the rectification module 1 with the output that disconnects rectification module 1 by control optoelectronic switch U1 conducting.

See also Fig. 2 and Fig. 2 b, described rectification module 1 comprises a rectifier bridge D4, transformer T1 and power management chip U2.The input of rectifier bridge D4 connects the alternating current of input, and alternating current is converted to direct current output.Output one end of rectifier bridge D4 is connected with an end on the former limit of transformer T1, and an other end is connected with power management chip U2.The output of this power management chip U2 is connected with an other end on the former limit of transformer T1.Like this, power management chip U2 just can send the PWM waveform, and passes through the duty cycle adjustment of PWM ripple to the effective value of the alternating current of transformer T1 former limit input, the output of control supply unit.Power management chip U2 is provided with a control end, and the feedback signal of feedback module 2 is connected with the control end of this power management chip U2, so that power management chip U2 can according to feedback signal and inner voltage reference be controlled and the output voltage of adjusting supply unit.Transformer T1 is used for regulation output voltage, and the high pressure of inputting is reduced to the supply unit required voltage.Transformer T1 has one first secondary, and this first secondary is connected output DC with the first output 13 of rectification module 1.

See also Fig. 2 d, because supply unit is different to the output requirement of power supply, for the range of application of power supply expanding device, transformer T1 also is provided with one second secondary, and the direct current of this second secondary is exported after power supply chip 121 voltage stabilizings.

Because the alternating current hum of input is many, therefore in supply unit, also be provided with an input filter module 3.See also Fig. 2 and Fig. 2 a, input filter module 3 comprises the first capacitor C 7, the first inductance L 1 and the second capacitor C 11 and the 3rd capacitor C 12.The first capacitor C 7 arranges between two inputs with filter inductance L1, filters the differential mode interference signal in the alternating current that electricity inputs, and the second capacitor C 11 and the 3rd capacitor C 12 are respectively and between two inputs and ground of filter inductance L1.The common mode interference signal of filter inductance L1, the second capacitor C 11 and the 3rd capacitor C 12 filtering alternating currents.

In order to improve the output performance of supply unit, also comprise an output filtering module 131.This output filtering module 131 comprises one the 4th capacitor C 3 and the first inductance L 2 and the 5th capacitor C 4.The 4th capacitor C 3 is located between the first output 13, and the first inductance L 2 one ends are connected with the power end of the first output 131, and an other end is connected in series with the 5th capacitor C 4.An other end of the 5th capacitor C 4 is connected with the GND of the first output.The input of external circuit is connected between the second inductance L 2 and the 5th capacitor C 4.

Between the second output 12, also be serially connected with one the 6th capacitor C 1, be used for the hash of filtering the second output 12.

During use, power management chip U2 adjusts the duty ratio of the PWM waveform of its output according to the comparative result of the amplitude of the feedback signal reference voltage inner with it, recently changes the voltage of output by adjusting duty, reaches the purpose of constant voltage output.

With respect to prior art, the electronic component that supply unit described in the utility model uses is few, output voltage is constant and precision is high, and because the 4th capacitor C 3, the second capacitor C 11 and the 6th capacitor C 1 used are solid capacitor, effectively the volume of small electric source apparatus is realized the miniaturization of supply unit.

More than describe preferred embodiment of the present utility model in detail, the ordinary skill that should be appreciated that this area need not creative work and just can make many modifications and variations according to design of the present utility model.Therefore, all in the art technical staff according to the utility model design on the prior art basis by logic analysis, reasoning or according to the available technical scheme of limited experiment, all should be among the determined protection range by these claims.

Claims

1. mini-switch power source device, comprise a rectification module and a feedback module, described rectification module has an input, the first output and feedback end, alternating current is from this input input, export from this first output after being converted to direct current, it is characterized in that, described feedback module comprises a switch element, described switch element has a control end, this control end is connected with described the first output, with the described rectification module of the signal back of the first output, described rectification module is adjusted output voltage according to the feedback signal that feedback end receives to switch element according to the signal of control end.

2. supply unit as claimed in claim 1 is characterized in that, described feedback module also comprises the first resistance and the second resistance that is serially connected between the first output, and the control end of described switching tube is connected between this first resistance and the second resistance.

3. supply unit as claimed in claim 2, it is characterized in that, also comprise an optoelectronic switch, described switch element is a thyristor, this thyristor is controlled the On/Off of this optoelectronic switch according to the feedback signal of control end, and the output signal of the first output is fed back to described rectification module.

4. supply unit as claimed in claim 3, it is characterized in that, described rectification module comprises a rectifier bridge, a transformer and a power management chip, the input input AC electricity of described rectifier bridge, output one end is connected to an end on the former limit of transformer, and an other end is connected to power management chip; The first secondary of transformer is connected to the first output, output DC; The output of power management chip is connected with an other end of transformer primary side, and power management chip is according to the output of feedback signal and internal reference regulation output end.

5. supply unit as claimed in claim 4 is characterized in that, also is provided with one second output, is provided with one second secondary in the described transformer, and the direct current of the second output output is exported after a power supply chip voltage stabilizing.

6. supply unit as claimed in claim 5, it is characterized in that, also comprise an input filter module, described input filter module comprises one first electric capacity, filter inductance, the second electric capacity and the 3rd electric capacity, described the first electric capacity is connected between two inputs of this filter inductance, two inputs of described filter inductance are connected to the input of described rectifier bridge, described the second electric capacity and the 3rd electric capacity be connected in series respectively and two outputs and the earth of this filter inductance between.

7. supply unit as claimed in claim 6, it is characterized in that, also comprise an output filtering module, described output filtering module comprises that one is serially connected in the 4th electric capacity and the first inductance and the 5th electric capacity that is connected in series between described the first output, described the 4th electric capacity and described the first inductance that is connected in series and the 5th Capacitance parallel connection.

8. supply unit as claimed in claim 7 is characterized in that, also comprises one the 6th electric capacity, and described the 6th capacitance series is between described the second output.

9. supply unit as claimed in claim 8 is characterized in that, described the 4th electric capacity, the second electric capacity and the 6th electric capacity are solid capacitor.