CN203747645U - Power adapter circuit for voice products - Google Patents
Power adapter circuit for voice products Download PDFInfo
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- CN203747645U CN203747645U CN201320873219.3U CN201320873219U CN203747645U CN 203747645 U CN203747645 U CN 203747645U CN 201320873219 U CN201320873219 U CN 201320873219U CN 203747645 U CN203747645 U CN 203747645U
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Abstract
A power adapter circuit for voice products relates to the technical field of power. The power adapter circuit comprises a mains supply input line, an EMI and rectifier/filter circuit, a high-frequency transformer circuit, a PWM pulse control circuit, a secondary-side rectifier and filter circuit and an output voltage regulation control circuit. The mains supply input line is provided with a double Y capacitor circuit, which can filter high-frequency interference alternating-current signals in a power grid. The mains supply input line is provided with a primary-side half-wave rectifier circuit, the frequency of alternating current with the input frequency being 50Hz is changed to 100Hz after half-wave rectification, and the frequency is doubled compared with that obtained after full-wave rectification. As the frequency increases after rectification, audio noise produced by power supply products is reduced accordingly. Therefore, if a voice product having strict requirements on voice adopts the power adapter circuit, the interference of noise to the product becomes smaller. The power adapter circuit is applicable to voice products sensitive to noise, and has the advantages of simple structure and low cost.
Description
Technical field
The utility model relates to power technique fields, particularly relates to a kind of power adapter circuit for voice products.
Background technology
Power supply adaptor is the power supply conversion equipment of small portable electronic device and electronic apparatus, is generally made up of shell, power transformer and rectification circuit, can be divided into and exchange output type and direct current output type by its output type; Can be divided into Direct Plug-In and Table top type by connected mode.
The power supply adaptor of prior art, generally to utilize full-wave rectifying circuit to carry out full-wave rectification at EMI and current rectifying and wave filtering circuit rear end, normally form full-wave rectifier by four 1N4007 rectifier diodes, 220V interchange frequency of its waveform after full-wave rectification of input 50Hz frequency is constant, this frequency can produce audio-frequency noise to the whole set equipment of its power supply, so common power supply adaptor is not suitable for to require more sensitive voice products to power to noise;
In addition, the power adapter circuit of prior art generally all fills a Y electric capacity, and Y electric capacity is to be connected between the primary and secondary of transformer in circuit, the effect of Y electric capacity is the electromagnetic interference that filtering transformer produces in high-frequency work, so that EMI can easily pass through, but the power supply adaptor of a Y electric capacity of this kind has the interference of high-frequency cacophony for voice products, can affect the quality of call.
Summary of the invention
The purpose of this utility model is to avoid weak point of the prior art and a kind of power adapter circuit for voice products is provided, this power adapter circuit that is used for voice products is suitable for the more sensitive voice products of noise requirements to use, circuit structure is simple, can reduce costs.
The purpose of this utility model is achieved through the following technical solutions:
A kind of power adapter circuit for voice products is provided, comprise civil power incoming line, EMI and current rectifying and wave filtering circuit, high frequency transformer circuit, pwm pulse control circuit, secondary side current rectifying and wave filtering circuit and output controlling circuit of voltage regulation, the output of civil power incoming line is connected with the input of EMI and current rectifying and wave filtering circuit, the output of EMI and current rectifying and wave filtering circuit is connected with the input of high frequency transformer circuit, high frequency transformer circuit Yi road is connected with pwm control circuit is two-way, another road output of high frequency transformer circuit is connected with the first input end of secondary side current rectifying and wave filtering circuit, the second input of secondary side current rectifying and wave filtering circuit is connected with the first output of output controlling circuit of voltage regulation, the second output of output controlling circuit of voltage regulation is connected with pwm pulse control circuit, civil power incoming line comprises primary side half-wave rectifying circuit and the two Y condenser networks for the High-frequency Interference AC signal of filtering electrical network.
Wherein, primary side half-wave rectifying circuit comprises that model is diode D1 and the diode D2 of 1N4007.
Wherein, two Y condenser networks comprise the Y capacitor C Y1 and the Y capacitor C Y2 that are connected to respectively between the live wire of civil power and ground and between zero line and ground.
Wherein, EMI and current rectifying and wave filtering circuit comprise the DC voltage filtering after the halfwave rectifier of primary side half-wave rectifying circuit are become to the electrochemical capacitor C1 of level and smooth direct voltage and C2, ceramic disc capacitor C3 and inductance L 1 for the conducted interference of filtering EMI.
Wherein, high frequency transformer main circuit will comprise the primary and secondary winding T1-1 of transformer.
Wherein, secondary side current rectifying and wave filtering circuit mainly comprises diode D7 and electrochemical capacitor C8, for by the secondary induction of high frequency transformer circuit to voltage become the desired level and smooth stable DC direct voltage of external equipment.
Wherein, output controlling circuit of voltage regulation mainly comprises the photophore U2-A of optocoupler and the reference voltage stabilizing source U3 that model is TL431; Pwm pulse control circuit mainly comprises that model is pwm chip U1, the light-receiving device U2-B of optocoupler, feedback winding T1-2, the switching tube Q1 of transformer and other peripheral circuit of pwm chip U1 of OB2358, pwm pulse control circuit and output controlling circuit of voltage regulation detect the variation of output voltage electric current by feedback winding T1-2, optocoupler U2 and reference voltage stabilizing source U3, by the working pulse width of pwm chip U1 control switch pipe Q1, make the electric current and voltage of output remain stable.
The beneficial effects of the utility model: the utility model comprises civil power incoming line, EMI and current rectifying and wave filtering circuit, high frequency transformer circuit, pwm pulse control circuit, secondary side current rectifying and wave filtering circuit and output controlling circuit of voltage regulation, the output of civil power incoming line is connected with the input of EMI and current rectifying and wave filtering circuit, the output of EMI and current rectifying and wave filtering circuit is connected with the input of high frequency transformer circuit, high frequency transformer circuit Yi road is connected with pwm control circuit is two-way, another road output of high frequency transformer circuit is connected with the first input end of secondary side current rectifying and wave filtering circuit, the second input of secondary side current rectifying and wave filtering circuit is connected with the first output of output controlling circuit of voltage regulation, the second output of output controlling circuit of voltage regulation is connected with pwm pulse control circuit, by be provided with two Y condenser networks at civil power input circuit, High-frequency Interference AC signal in can filtering electrical network, by being provided with primary side half-wave rectifying circuit at civil power incoming line, civil power incoming frequency is that the 220V alternating current of 50Hz is after halfwave rectifier, the frequency of its waveform can become 100Hz, increase and be twice than the frequency after full-wave rectification, because the frequency after rectification increases, so the machine product of power supply is produced, audio-frequency noise is corresponding to diminish, therefore voice there is the voice products of strict demand, use this power supply adaptor, it is subject to the interference of noise will become less, make this power adapter circuit be suitable for the more sensitive voice products of noise requirements to use, this circuit structure is simple, can reduce costs.
Brief description of the drawings
Utilize accompanying drawing to be described further utility model, but the embodiment in accompanying drawing does not form any restriction of the present utility model, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to the following drawings other accompanying drawing.
Fig. 1 is the circuit diagram of a kind of power adapter circuit for voice products of the present utility model.
1---civil power incoming line;
2---EMI and current rectifying and wave filtering circuit;
3---high frequency transformer circuit;
4---pwm pulse control circuit;
5---secondary side current rectifying and wave filtering circuit;
6---output controlling circuit of voltage regulation.
Embodiment
With the following Examples the utility model is further described.
A kind of power adapter circuit for voice products of the present embodiment, as shown in Figure 1, comprise civil power incoming line 1, EMI and current rectifying and wave filtering circuit 2, high frequency transformer circuit 3, pwm pulse control circuit 4, secondary side current rectifying and wave filtering circuit 5 and output controlling circuit of voltage regulation 6, the output of civil power incoming line 1 is connected with the input of EMI and current rectifying and wave filtering circuit 2, the output of EMI and current rectifying and wave filtering circuit 2 is connected with the input of high frequency transformer circuit 3, high frequency transformer circuit 3 Yi roads are connected with pwm control circuit is two-way, another road output of high frequency transformer circuit 3 is connected with the first input end of secondary side current rectifying and wave filtering circuit 5, the second input of secondary side current rectifying and wave filtering circuit 5 is connected with the first output of output controlling circuit of voltage regulation 6, the second output of output controlling circuit of voltage regulation 6 is connected with pwm pulse control circuit 4, civil power incoming line 1 comprises primary side half-wave rectifying circuit and the two Y condenser networks for the High-frequency Interference AC signal of filtering electrical network.
Wherein, primary side half-wave rectifying circuit comprises that model is diode D1 and the diode D2 of 1N4007.
Wherein, two Y condenser networks comprise the Y capacitor C Y1 and the Y capacitor C Y2 that are connected to respectively between the live wire of civil power and ground and between zero line and ground.
Wherein, EMI and current rectifying and wave filtering circuit 2 comprise the DC voltage filtering after the halfwave rectifier of primary side half-wave rectifying circuit are become to the electrochemical capacitor C1 of level and smooth direct voltage and C2, ceramic disc capacitor C3 and inductance L 1 for the conducted interference of filtering EMI.
Wherein, high frequency transformer circuit 3 mainly comprises the primary and secondary winding T1-1 of transformer.
Wherein, secondary side current rectifying and wave filtering circuit 5 mainly comprises diode D7 and electrochemical capacitor C8, for by the secondary induction of high frequency transformer circuit to voltage become the desired level and smooth stable DC direct voltage of external equipment.
Wherein, output controlling circuit of voltage regulation 6 mainly comprises the photophore U2-A of optocoupler and the reference voltage stabilizing source U3 that model is TL431; Pwm pulse control circuit 4 mainly comprises that model is pwm chip U1, the light-receiving device U2-B of optocoupler, feedback winding T1-2, the switching tube Q1 of transformer and other peripheral circuit of pwm chip U1 of OB2358, pwm pulse control circuit and output controlling circuit of voltage regulation detect the variation of output voltage electric current by feedback winding T1-2, optocoupler U2 and reference voltage stabilizing source U3, by the working pulse width of pwm chip U1 control switch pipe Q1, make the electric current and voltage of output remain stable.
The operation principle of Fig. 1 is as follows:
Civil power incoming line 1 is by the 220V/50HZ alternating voltage of input, through the High-frequency Interference AC signal in Y capacitor C Y1 and Y capacitor C Y2 filtering electrical network, carry out halfwave rectifier through diode D1 and D2 again, pass through again EMI and current rectifying and wave filtering circuit 2, be filtered into level and smooth direct voltage finally by crossing electrochemical capacitor C1, for the high frequency transformer circuit 3 of rear class provides energy, high frequency transformer circuit 3 is accepted the energy that prime is supplied with, switching tube Q1 is subject to the control of pwm chip U1, when pwm chip U1 work, switching tube Q1 is in conducting and the cut-off state of a high speed, thereby make transformer follow all the time the state that it is operated in an energy storage and releases energy, the secondary induction that the effect of secondary side current rectifying and wave filtering circuit 5 is to make high frequency transformer circuit 3 to voltage become the desired level and smooth stable DC direct voltage of external equipment, pwm pulse control circuit 4 and output controlling circuit of voltage regulation 6 are by the variation of feedback winding and reference voltage stabilizing source U2 and optocoupler U3 detection output voltage electric current, by the working pulse width of pwm chip U1 control switch pipe Q1, make the electric current and voltage of output remain stable.
The present embodiment is by be provided with two Y condenser networks at civil power input circuit, the High-frequency Interference AC signal in can filtering electrical network, by being provided with primary side half-wave rectifying circuit at civil power incoming line, civil power incoming frequency is that the 220V alternating current of 50Hz is after halfwave rectifier, the frequency of its waveform can become 100Hz, increase and be twice than the frequency after full-wave rectification, because the frequency after rectification increases, so the machine product of power supply is produced, audio-frequency noise is corresponding to diminish, therefore voice there is the voice products of strict demand, use this power supply adaptor, it is subject to the interference of noise will become less, make this power adapter circuit be suitable for the more sensitive voice products of noise requirements to use, this circuit structure is simple, can reduce costs.
Finally should be noted that; above embodiment is only in order to illustrate the technical solution of the utility model; but not restriction to the utility model protection range; although the utility model has been done to explain with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify or be equal to replacement the technical solution of the utility model, and not depart from essence and the scope of technical solutions of the utility model.
Claims (7)
1. the power adapter circuit for voice products, it is characterized in that: comprise civil power incoming line, EMI and current rectifying and wave filtering circuit, high frequency transformer circuit, pwm pulse control circuit, secondary side current rectifying and wave filtering circuit and output controlling circuit of voltage regulation, the output of civil power incoming line is connected with the input of EMI and current rectifying and wave filtering circuit, the output of EMI and current rectifying and wave filtering circuit is connected with the input of high frequency transformer circuit, high frequency transformer circuit Yi road is connected with pwm control circuit is two-way, another road output of high frequency transformer circuit is connected with the first input end of secondary side current rectifying and wave filtering circuit, the second input of secondary side current rectifying and wave filtering circuit is connected with the first output of output controlling circuit of voltage regulation, the second output of output controlling circuit of voltage regulation is connected with pwm pulse control circuit, civil power incoming line comprises primary side half-wave rectifying circuit and the two Y condenser networks for the High-frequency Interference AC signal of filtering electrical network.
2. a kind of power adapter circuit for voice products as claimed in claim 1, is characterized in that: primary side half-wave rectifying circuit comprises that model is diode D1 and the diode D2 of 1N4007.
3. a kind of power adapter circuit for voice products as claimed in claim 2, is characterized in that: two Y condenser networks comprise the Y capacitor C Y1 and the Y capacitor C Y2 that are connected to respectively between the live wire of civil power and ground and between zero line and ground.
4. a kind of power adapter circuit for voice products as claimed in claim 3, is characterized in that: EMI and current rectifying and wave filtering circuit comprise the DC voltage filtering after the halfwave rectifier of primary side half-wave rectifying circuit is become to the electrochemical capacitor C1 of level and smooth direct voltage and C2, ceramic disc capacitor C3 and inductance L 1 for the conducted interference of filtering EMI.
5. a kind of power adapter circuit for voice products as claimed in claim 4, is characterized in that: high frequency transformer main circuit will comprise the primary and secondary winding T1-1 of transformer.
6. a kind of power adapter circuit for voice products as claimed in claim 5, it is characterized in that: secondary side current rectifying and wave filtering circuit mainly comprises diode D7 and electrochemical capacitor C8, for by the secondary induction of high frequency transformer circuit to voltage become the desired level and smooth stable DC direct voltage of external equipment.
7. a kind of power adapter circuit for voice products as claimed in claim 6, is characterized in that: output controlling circuit of voltage regulation mainly comprises the photophore U2-A of optocoupler and the reference voltage stabilizing source U3 that model is TL431; Pwm pulse control circuit mainly comprises that model is pwm chip U1, the light-receiving device U2-B of optocoupler, feedback winding T1-2, the switching tube Q1 of transformer and other peripheral circuit of pwm chip U1 of OB2358, pwm pulse control circuit and output controlling circuit of voltage regulation detect the variation of output voltage electric current by feedback winding T1-2, optocoupler U2 and reference voltage stabilizing source U3, by the working pulse width of pwm chip U1 control switch pipe Q1, make the electric current and voltage of output remain stable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320873219.3U CN203747645U (en) | 2013-12-28 | 2013-12-28 | Power adapter circuit for voice products |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320873219.3U CN203747645U (en) | 2013-12-28 | 2013-12-28 | Power adapter circuit for voice products |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203747645U true CN203747645U (en) | 2014-07-30 |
Family
ID=51347398
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320873219.3U Expired - Fee Related CN203747645U (en) | 2013-12-28 | 2013-12-28 | Power adapter circuit for voice products |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203747645U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109980953A (en) * | 2019-04-14 | 2019-07-05 | 查正春 | A kind of sound equipment power source special adapter |
| CN110048587A (en) * | 2019-05-14 | 2019-07-23 | 安徽亚辉电气自动化有限公司 | A kind of supply harmonic suppressor with buffer protection circuit |
-
2013
- 2013-12-28 CN CN201320873219.3U patent/CN203747645U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109980953A (en) * | 2019-04-14 | 2019-07-05 | 查正春 | A kind of sound equipment power source special adapter |
| CN110048587A (en) * | 2019-05-14 | 2019-07-23 | 安徽亚辉电气自动化有限公司 | A kind of supply harmonic suppressor with buffer protection circuit |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140730 Termination date: 20181228 |
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| CF01 | Termination of patent right due to non-payment of annual fee |