CN207732657U - A kind of safety-type Switching Power Supply - Google Patents
A kind of safety-type Switching Power Supply Download PDFInfo
- Publication number
- CN207732657U CN207732657U CN201721277188.XU CN201721277188U CN207732657U CN 207732657 U CN207732657 U CN 207732657U CN 201721277188 U CN201721277188 U CN 201721277188U CN 207732657 U CN207732657 U CN 207732657U
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- circuit
- power supply
- safety
- switching power
- connect
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The utility model is related to a kind of safety-type Switching Power Supplies, by cathode by the way that in a higfh-tension ceramics capacitance connection to ground wire, at this point, between the cathode and the earth of power supply, electrical link is established by a higfh-tension ceramics capacitance.In higfh-tension ceramics capacitance connection to ground wire, at this point, between the cathode and the earth of power supply, electrical link is established by a higfh-tension ceramics capacitance.Ac induction voltage ingredient contained by switched power output can be transmitted to the earth by higfh-tension ceramics capacitance, and Switching Power Supply will not result in electrical appliance metal shell and generate electrostatic；Meanwhile if there is other reasons cause electrical appliance metal shell to generate electrostatic, charge can also be discharged into the earth by the higfh-tension ceramics capacitance, ensure personal safety.
Description
Technical field
The utility model is related to a kind of Switching Power Supplies, and in particular to a kind of " three inputs, two output " safety-type small power switch
Power supply.
Background technology
Small-power switching power-supply on the market at present（Output power is not more than 36W）The overwhelming majority is all made of two-phase input shape
Formula, i.e. ac input end only have firewire and zero curve.Internal circuit configuration includes mainly protective tube, current rectifying and wave filtering circuit, driving electricity
Road, high frequency transformer, output circuit, feedback circuit etc..Output end is anode and cathode, without any between cathode and the earth
System.
Caused by the operation principle characteristic of Switching Power Supply, contain ac induction voltage in the direct current output of power supply,
The induced voltage Producing reason has：1, transformer leakage inductance；2, high-frequency coupling；3, power status is abnormal, and first class B insulation reduces
Deng.Waveform of the induced voltage to the earth is can observe by oscillograph, the usual induced voltage peak-to-peak value is 310V or so, frequency
Rate is 50Hz, due to being an empty voltage over the ground, does not influence electrical equipment work under normal conditions, will not directly result in the person
It gets an electric shock.But when such Switching Power Supply is used for metal-clad type electrical appliance, it will be produced due to capacity effect on electrical appliance shell
Raw electrostatic, when the charge accumulated on metal shell to a certain extent when, human contact's shell just has electric shock phenomenon, the needle of moment
It pricks and feels.Especially when electrical appliance shell is connected with power cathode, electrostatic becomes apparent.
Invention content
To solve the above-mentioned problems, the utility model provides a kind of safety-type Switching Power Supply, including input protection circuit, defeated
Enter filter circuit, current rectifying and wave filtering circuit, control driving circuit, output circuit, feedback circuit, safety protective circuit；
The Switching Power Supply includes firewire input terminal, zero curve input terminal, ground wire input terminal；
Input protection circuit is connect with firewire and zero curve；
Input filter circuit is connect with input protection circuit；
Current rectifying and wave filtering circuit is connect with input filter circuit；
Control driving circuit is connect with current rectifying and wave filtering circuit；
High frequency transformer is connect with control driving circuit；
Output circuit is connect with high frequency transformer；
Safety protective circuit is connect with output circuit and ground wire；
Feedback circuit is connect with control driving circuit, high frequency transformer, output circuit；
Input protection circuit is for overcurrent protection, surge protection, heavy current impact protection；
Input filter circuit is a common mode interference filter；
Current rectifying and wave filtering circuit includes a rectifier bridge stack and at least one electrolytic capacitor；
It includes pwm chip and high-voltage starting circuit to control driving circuit；
Output rectifier and filter includes rectifier diode, at least two high frequency low-resistance filter capacitors in parallel, rod type electricity
Sense；
Feedback circuit is optocoupler sampling feedback circuit；
Safety protective circuit is the higfh-tension ceramics capacitance being connected between negative pole of output end and ground wire, capacitance between
4700pF is between 0.1uF.
The utility model has the beneficial effects that：Ac induction voltage contained by the utility model switched power output at
It point is substantially reduced, when the capacitance of higfh-tension ceramics capacitance is selected as 0.1uF, oscillograph observes the peak of induced voltage waveform over the ground
Peak value is 3V or so, when being used for the electrical appliance of metal outer casings, due to there is this discharge channel of safety protective circuit, and nothing on shell
Method accumulates a large amount of charges generation electrostatic and brings threat to personal safety, while ensure that the works fine condition of electrical appliance.
Description of the drawings
Fig. 1 is one embodiment functional block diagram of the utility model.
Fig. 2 is one embodiment circuit diagram of the utility model.
Specific implementation mode
The utility model solve background problems one of thinking be：Cathode is passed through into a higfh-tension ceramics capacitance connection to ground
On line, at this point, between the cathode and the earth of power supply, electrical link is established by a higfh-tension ceramics capacitance.Higfh-tension ceramics
In capacitance connection to ground wire, at this point, between the cathode and the earth of power supply, established by a higfh-tension ceramics capacitance electrical
System.Ac induction voltage ingredient contained by switched power output can be transmitted to the earth by higfh-tension ceramics capacitance, open
Powered-down source will not result in electrical appliance metal shell and generate electrostatic；Meanwhile if there is other reasons lead to electrical appliance metal shell
Electrostatic is generated, charge can also be discharged into the earth by the higfh-tension ceramics capacitance, ensure personal safety.
Embodiment 1
A kind of safety-type Switching Power Supply, including input protection circuit, input filter circuit, current rectifying and wave filtering circuit, control are driven
Dynamic circuit, output circuit, feedback circuit, safety protective circuit；
The Switching Power Supply includes firewire input terminal, zero curve input terminal, ground wire input terminal；
Input protection circuit is connect with firewire and zero curve；
Input filter circuit is connect with input protection circuit；
Current rectifying and wave filtering circuit is connect with input filter circuit；
Control driving circuit is connect with current rectifying and wave filtering circuit；
High frequency transformer is connect with control driving circuit；
Output circuit is connect with high frequency transformer；
Safety protective circuit is connect with output circuit and ground wire；
Feedback circuit is connect with control driving circuit, high frequency transformer, output circuit；
Input protection circuit is for overcurrent protection, surge protection, heavy current impact protection；
Input filter circuit is a common mode interference filter；
Current rectifying and wave filtering circuit includes a rectifier bridge stack and at least one electrolytic capacitor；
It includes pwm chip and high-voltage starting circuit to control driving circuit；
Output rectifier and filter includes rectifier diode, at least two high frequency low-resistance filter capacitors in parallel, rod type electricity
Sense；
Feedback circuit is optocoupler sampling feedback circuit；
Safety protective circuit is the higfh-tension ceramics capacitance being connected between negative pole of output end and ground wire, capacitance between
4700pF is between 0.1uF.
In the present embodiment Switching Power Supply by cathode by a higfh-tension ceramics capacitance connection to ground wire, at this point, power supply
Cathode and the earth between, electrical link is established by a higfh-tension ceramics capacitance.Contained by switched power output
Ac induction voltage ingredient can be transmitted to the earth by higfh-tension ceramics capacitance, and Switching Power Supply will not result in the present embodiment
Electrical appliance metal shell generates electrostatic；Meanwhile if there is other reasons cause electrical appliance metal shell to generate electrostatic, charge also may be used
To be discharged into the earth by the higfh-tension ceramics capacitance, personal safety has been ensured.
Claims (8)
1. a kind of safety-type Switching Power Supply, which is characterized in that including input protection circuit, input filter circuit, rectifying and wave-filtering electricity
Road, control driving circuit, output circuit, feedback circuit, safety protective circuit；
Switching Power Supply includes firewire input terminal, zero curve input terminal, ground wire input terminal；
Input protection circuit is connect with firewire and zero curve；
Input filter circuit is connect with input protection circuit；
Current rectifying and wave filtering circuit is connect with input filter circuit；
Control driving circuit is connect with current rectifying and wave filtering circuit；
High frequency transformer is connect with control driving circuit；
Output circuit is connect with high frequency transformer；
Safety protective circuit is connect with output circuit and ground wire；
Feedback circuit is connect with control driving circuit, high frequency transformer, output circuit.
2. a kind of safety-type Switching Power Supply as described in claim 1, which is characterized in that
Input protection circuit is for overcurrent protection, surge protection, heavy current impact protection.
3. a kind of safety-type Switching Power Supply as described in claim 1, which is characterized in that
Input filter circuit is a common mode interference filter.
4. a kind of safety-type Switching Power Supply as described in claim 1, which is characterized in that
Current rectifying and wave filtering circuit includes a rectifier bridge stack and at least one electrolytic capacitor.
5. a kind of safety-type Switching Power Supply as described in claim 1, which is characterized in that
It includes pwm chip and high-voltage starting circuit to control driving circuit.
6. a kind of safety-type Switching Power Supply as described in claim 1, which is characterized in that
Output rectifier and filter includes rectifier diode, at least two high frequency low-resistance filter capacitors in parallel, rod type inductance.
7. a kind of safety-type Switching Power Supply as described in claim 1, which is characterized in that
Feedback circuit is optocoupler sampling feedback circuit.
8. a kind of safety-type Switching Power Supply as described in claim 1, which is characterized in that
Safety protective circuit is the higfh-tension ceramics capacitance being connected between negative pole of output end and ground wire, capacitance between 4700pF extremely
Between 0.1uF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721277188.XU CN207732657U (en) | 2017-09-30 | 2017-09-30 | A kind of safety-type Switching Power Supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721277188.XU CN207732657U (en) | 2017-09-30 | 2017-09-30 | A kind of safety-type Switching Power Supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207732657U true CN207732657U (en) | 2018-08-14 |
Family
ID=63090968
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721277188.XU Expired - Fee Related CN207732657U (en) | 2017-09-30 | 2017-09-30 | A kind of safety-type Switching Power Supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207732657U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112737362A (en) * | 2020-12-23 | 2021-04-30 | 北京深思数盾科技股份有限公司 | Power adapter and electronic device |
-
2017
- 2017-09-30 CN CN201721277188.XU patent/CN207732657U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112737362A (en) * | 2020-12-23 | 2021-04-30 | 北京深思数盾科技股份有限公司 | Power adapter and electronic device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PP01 | Preservation of patent right | ||
| PP01 | Preservation of patent right |
Effective date of registration: 20191030 Granted publication date: 20180814 |
|
| PD01 | Discharge of preservation of patent | ||
| PD01 | Discharge of preservation of patent |
Date of cancellation: 20221030 Granted publication date: 20180814 |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180814 |