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Test standard for switching power supply

Time: 2017-07-20﹛﹛View: 799


Switching power supply as the new energy products, it is the heart part of electrical products, if not normal switching power supply work will cause the abnormal of the electrical work, here are some of switch power supply to introduce some basic parameters.
1 describe several indicators that affect the output voltage of the input voltage
Coefficient of stability
The absolute stability factor of switch power supply (linear adjustment rate)
At constant load, dc regulated power supply output voltage variation delta Uo with input voltage variation ratio of the delta Ui, namely K = delta Uo/delta Ui, switch power supply requirements are usually 3%
Grid adjustment rate
Switch power grid by grid voltage regulation said rating changes / - 10% (90-264 - vac), the relative change of the regulated power supply output voltage, sometimes expressed in absolute value. Typically within 5%
The effect of load on several indexes of the output voltage
Load adjusted rate (also known as current adjustment rate)
Under the rated ac voltage (100-240 vac) and load current changes from zero to the maximum, the output voltage of the maximum relative variation, commonly expressed as percentage, sometimes expressed in absolute variation. The average requirement is within 5%
Three lines of voltage in several indices
The coefficient of the wave coefficient, Y (%).
At the rated load, the effective value of the output ripple voltage is the same as the output dc voltage, which is Y = Umrs/Uo x100 %.
Maximum ripple voltage
The magnitude of the absolute value of the output voltage ripple (including noise) at the rated output voltage and load current, usually expressed as a peak or valid value. The usual 100/240vac empty load and full load of ripple
The voltage suppression ratio of a
(such as the regulation of ripple frequency 50 hz), of the input voltage ripple voltage Ui ~ and the ratio of the output voltage of the ripple voltage Uo ~, namely: the voltage ripple suppression ratio = Ui ~ / Uo ~.
Electrical safety requirement
The safety requirements of the power supply structure
Space requirement
The UL, CSA, and VDE safety specifications emphasize the distance between the surface and space between the charged parts and the charged part and the non-charged metal parts. UL, CSA requirements: high voltage electrode voltages greater than or equal to 250 vac, between a conductor and the high voltage between conductors and the charged metal parts (not including wire) between here, no matter or in space between the surface, the distance should be 0.1 inches; VDE requires a 3mm or 2mm clearance between the ac lines. IEC requirements: there are 3mm clearance between the ac lines and the 4mm clearance between ac and ground conductors. In addition, VDE, IEC requires that there is at least 8mm space between the output of the power supply and the input.
Electric dielectric test method
High pressure: input and output, input and ground, enter AC two levels. The standard is 3KV 60, the production line 3KV 3S.
Leakage current measurement
The leakage current is the current flowing through the input side geodesic, which is mainly through the leakage current of the by-pass capacitor in the switch power supply. UL, CSA requirements exposed not charged metal parts should be into the earth, is through the part with the earth leakage current measurement of indirect 次 resistance, a 1.5 K is greater than 5 mm in its leakage current should not mA. VDE allows for 1.5 K 次 NPF capacitance and resistance and 150, and use 1.06 times the rated voltage applied, the data processing equipment, leakage current should be no greater than 3.5 mA, usually about 1 mA.
Insulation resistance test
VDE requirements: between the input and output low voltage circuit should be 7 m 次 resistance, in can come into contact with the metal part and between input, should be 2 m 次 resistance or add 500 v dc voltage for 1 min.
Printed circuit board
Use UL certified 94v-2 materials or better materials. Commonly used plates (fr-1, fr-4, CEM -1)
The safety requirement of the power transformer structure
The insulation of the transformer
The copper wire used for transformer windings should be enameled wire, and other metal parts should be coated with porcelain, lacquer and other insulating materials. The first stage has at least 4MM safe distance, usually used with a wall or using a three-layer insulated wire to meet the requirement
The dielectric strength of a transformer
In the experiment, there should be no rupture of insulation and the phenomenon of flying arc. Usually at high pressure 3750VAC.
The insulation resistance of the transformer
Transformer winding for at least 10 m 次, insulation resistance between the winding and core, skeleton, and applying the 500 v dc voltage, shield last 1 min, should not appear breakdown, flashover phenomenon.
Transformer humidity resistance
The transformer must be subjected to the insulation resistance and dielectric strength test immediately after it is placed in the humid environment, and meet the requirements. Damp environment is commonly: relative humidity is 92% (tolerance is 2%), temperature stability between 20 ⊥ and 30 ⊥, 1% of allowable error, need, to place at least 48 h after the experiment immediately. The transformer temperature should not be 4 ⊥ higher than that of the test before entering the damp environment.
VDE requirements for transformer temperature characteristics.
The requirements for the temperature characteristics of the transformer are given by the CSA.
5 electromagnetic compatibility test
Electromagnetic compatibility is refers to the equipment or system in the common electromagnetic environment can work normally and no any things in the environment can?t afford to have the ability of electromagnetic interference.
Electromagnetic interference waves usually have two ways of communication, and they should be paid by various means. An approach that spreads to the power line at a longer wavelength band, which is usually below 30MHz. The longer wavelength frequency attached to electronic equipment within the scope of the power cord length less than one wavelength, the quantity of the radiation to the space is little, which can be master in power line voltage, which can make full * estimate interference, the size of the this kind of noise is called conduction.
When the frequency reaches over 30 MHZ, the wavelength will also be shorter. At this time, if only the noise source voltage that occurs in the power source line is applied to the source voltage, it is not in conformity with the actual interference. Therefore, the noise is called radiation noise by means of direct determination of the noise size of interference wave * valence. The method of measuring the noise of radiation and the method of measuring the interference wave of the propagation space by the intensity of the electric field and the method to determine the power of the leakage to the power line.
Electromagnetic compatibility tests include the following:
Magnetic susceptibility
(anti-interference) devices, systems or systems exposed to electromagnetic radiation do not want to have a degree of responsiveness. The smaller the sensitivity, the higher the sensitivity and the worse the disturbance. This includes the magnetic field test of fixed frequency and peak value.
Electrostatic discharge sensitivity
The charge transfer of an object with different electrostatic potential or direct contact. 300 pf capacitor charging to - 15000 - v, through 500 次 resistance discharge. It?s super bad, but it?s normal after it?s done. After testing, data transfer and storage cannot be lost.
Power supply transient sensitivity
Including spike sensitivity (0.5, 10 mu mu s s 2 times), the transient voltage sensitivity (10% - 30%, 30 s recovery), frequency, transient sensitivity (5% - 10%, 30 s recovery).
Radiation sensitivity
A measure of the radiation interference field that causes degradation of the equipment. (14kHz - 1GHz, the field strength is 1V/M).
Sensitivity to conduction
A measure of interference signals or voltages on the power, control, or signal lines when the device is not expected to respond or degrade its performance. (30hz-50khz / 3V, 50kHz - 400MHz / 1V).
6 non-working state magnetic interference
The package is 4.6 m, and the flux density is less than 0.525 mu T. 0.9 m, 0.525 mu T.
The system interferes with the magnetic field
Upper, lower, left, right ac flux density is less than 0.5 mT.
Interference by interference
Interference along the propagation of conductors. 10khz-30mhz, 60 (48) dB mu V.
Radiation interference
Electromagnetic interference transmitted by electromagnetic waves through space. 10khz-1000mhz, 30 shielding Chambers 60 (54) mu V/m.
The latest power adapters include CEC, ERP, etc
For example, the empty load power should not be greater than 0. 3 w.
Switching power supply as the new energy products, it is the heart part of electrical products, if not normal switching power supply work will cause the abnormal of the electrical work, here are some of switch power supply to introduce some basic parameters.
1 describe several indicators that affect the output voltage of the input voltage
Coefficient of stability
The absolute stability factor of switch power supply (linear adjustment rate)
At constant load, dc regulated power supply output voltage variation delta Uo with input voltage variation ratio of the delta Ui, namely K = delta Uo/delta Ui, switch power supply requirements are usually 3%
Grid adjustment rate
Switch power grid by grid voltage regulation said rating changes / - 10% (90-264 - vac), the relative change of the regulated power supply output voltage, sometimes expressed in absolute value. Typically within 5%
The effect of load on several indexes of the output voltage
Load adjusted rate (also known as current adjustment rate)
Under the rated ac voltage (100-240 vac) and load current changes from zero to the maximum, the output voltage of the maximum relative variation, commonly expressed as percentage, sometimes expressed in absolute variation. The average requirement is within 5%
Three lines of voltage in several indices
The coefficient of the wave coefficient, Y (%).
At the rated load, the effective value of the output ripple voltage is the same as the output dc voltage, which is Y = Umrs/Uo x100 %.
Maximum ripple voltage
The magnitude of the absolute value of the output voltage ripple (including noise) at the rated output voltage and load current, usually expressed as a peak or valid value. The usual 100/240vac empty load and full load of ripple
The voltage suppression ratio of a
(such as the regulation of ripple frequency 50 hz), of the input voltage ripple voltage Ui ~ and the ratio of the output voltage of the ripple voltage Uo ~, namely: the voltage ripple suppression ratio = Ui ~ / Uo ~.
Electrical safety requirement
The safety requirements of the power supply structure
Space requirement
The UL, CSA, and VDE safety specifications emphasize the distance between the surface and space between the charged parts and the charged part and the non-charged metal parts. UL, CSA requirements: high voltage electrode voltages greater than or equal to 250 vac, between a conductor and the high voltage between conductors and the charged metal parts (not including wire) between here, no matter or in space between the surface, the distance should be 0.1 inches; VDE requires a 3mm or 2mm clearance between the ac lines. IEC requirements: there are 3mm clearance between the ac lines and the 4mm clearance between ac and ground conductors. In addition, VDE, IEC requires that there is at least 8mm space between the output of the power supply and the input.
Electric dielectric test method
High pressure: input and output, input and ground, enter AC two levels. The standard is 3KV 60, the production line 3KV 3S.
Leakage current measurement
The leakage current is the current flowing through the input side geodesic, which is mainly through the leakage current of the by-pass capacitor in the switch power supply. UL, CSA requirements exposed not charged metal parts should be into the earth, is through the part with the earth leakage current measurement of indirect 次 resistance, a 1.5 K is greater than 5 mm in its leakage current should not mA. VDE allows for 1.5 K 次 NPF capacitance and resistance and 150, and use 1.06 times the rated voltage applied, the data processing equipment, leakage current should be no greater than 3.5 mA, usually about 1 mA.
Insulation resistance test
VDE requirements: between the input and output low voltage circuit should be 7 m 次 resistance, in can come into contact with the metal part and between input, should be 2 m 次 resistance or add 500 v dc voltage for 1 min.
Printed circuit board
Use UL certified 94v-2 materials or better materials. Commonly used plates (fr-1, fr-4, CEM -1)
The safety requirement of the power transformer structure
The insulation of the transformer
The copper wire used for transformer windings should be enameled wire, and other metal parts should be coated with porcelain, lacquer and other insulating materials. The first stage has at least 4MM safe distance, usually used with a wall or using a three-layer insulated wire to meet the requirement
The dielectric strength of a transformer
In the experiment, there should be no rupture of insulation and the phenomenon of flying arc. Usually at high pressure 3750VAC.
The insulation resistance of the transformer
Transformer winding for at least 10 m 次, insulation resistance between the winding and core, skeleton, and applying the 500 v dc voltage, shield last 1 min, should not appear breakdown, flashover phenomenon.switching power supply work will cause the abnormal of the electrical work, here are some of switch power supply to introduce some basic parameters.
1 describe several indicators that affect the output voltage of the input voltage
Coefficient of stability
The absolute stability factor of switch power supply (linear adjustment rate)
At constant load, dc regulated power supply output voltage variation delta Uo with input voltage variation ratio of the delta Ui, namely K = delta Uo/delta Ui, switch power supply requirements are usually 3%
Grid adjustment rate
Switch power grid by grid voltage regulation said rating changes / - 10% (90-264 - vac), the relative change of the regulated power supply output voltage, sometimes expressed in absolute value. Typically within 5%
The effect of load on several indexes of the output voltage
Load adjusted rate (also known as current adjustment rate)
Under the rated ac voltage (100-240 vac) and load current changes from zero to the maximum, the output voltage of the maximum relative variation, commonly expressed as percentage, sometimes expressed in absolute variation. The average requirement is within 5%
Three lines of voltage in several indices
The coefficient of the wave coefficient, Y (%).
At the rated load, the effective value of the output ripple voltage is the same as the output dc voltage, which is Y = Umrs/Uo x100 %.
Maximum ripple voltage
The magnitude of the absolute value of the output voltage ripple (including noise) at the rated output voltage and load current, usually expressed as a peak or valid value. The usual 100/240vac empty load and full load of ripple
The voltage suppression ratio of a
(such as the regulation of ripple frequency 50 hz), of the input voltage ripple voltage Ui ~ and the ratio of the output voltage of the ripple voltage Uo ~, namely: the voltage ripple suppression ratio = Ui ~ / Uo ~.
Electrical safety requirement
The safety requirements of the power supply structure
Space requirement
The UL, CSA, and VDE safety specifications emphasize the distance between the surface and space between the charged parts and the charged part and the non-charged metal parts. UL, CSA requirements: high voltage electrode voltages greater than or equal to 250 vac, between a conductor and the high voltage between conductors and the charged metal parts (not including wire) between here, no matter or in space between the surface, the distance should be 0.1 inches; VDE requires a 3mm or 2mm clearance between the ac lines. IEC requirements: there are 3mm clearance between the ac lines and the 4mm clearance between ac and ground conductors. In addition, VDE, IEC requires that there is at least 8mm space between the output of the power supply and the input.
Electric dielectric test method
High pressure: input and output, input and ground, enter AC two levels. The standard is 3KV 60, the production line 3KV 3S.
Leakage current measurement
The leakage current is the current flowing through the input side geodesic, which is mainly through the leakage current of the by-pass capacitor in the switch power supply. UL, CSA requirements exposed not charged metal parts should be into the earth, is through the part with the earth leakage current measurement of indirect 次 resistance, a 1.5 K is greater than 5 mm in its leakage current should not mA. VDE allows for 1.5 K 次 NPF capacitance and resistance and 150, and use 1.06 times the rated voltage applied, the data processing equipment, leakage current should be no greater than 3.5 mA, usually about 1 mA.
Insulation resistance test
VDE requirements: between the input and output low voltage circuit should be 7 m 次 resistance, in can come into contact with the metal part and between input, should be 2 m 次 resistance or add 500 v dc voltage for 1 min.
Printed circuit board
Use UL certified 94v-2 materials or better materials. Commonly used plates (fr-1, fr-4, CEM -1)
The safety requirement of the power transformer structure
The insulation of the transformer
The copper wire used for transformer windings should be enameled wire, and other metal parts should be coated with porcelain, lacquer and other insulating materials. The first stage has at least 4MM safe distance, usually used with a wall or using a three-layer insulated wire to meet the requirement
The dielectric strength of a transformer
In the experiment, there should be no rupture of insulation and the phenomenon of flying arc. Usually at high pressure 3750VAC.
The insulation resistance of the transformer
Transformer winding for at least 10 m 次, insulation resistance between the winding and core, skeleton, and applying the 500 v dc voltage, shield last 1 min, should not appear breakdown, flashover phenomenon.
Transformer humidity resistance
The transformer must be subjected to the insulation resistance and dielectric strength test immediately after it is placed in the humid environment, and meet the requirements. Damp environment is commonly: relative humidity is 92% (tolerance is 2%), temperature stability between 20 ⊥ and 30 ⊥, 1% of allowable error, need, to place at least 48 h after the experiment immediately. The transformer temperature should not be 4 ⊥ higher than that of the test before entering the damp environment.
VDE requirements for transformer temperature characteristics.
The requirements for the temperature characteristics of the transformer are given by the CSA.
5 electromagnetic compatibility test
Electromagnetic compatibility is refers to the equipment or system in the common electromagnetic environment can work normally and no any things in the environment can?t afford to have the ability of electromagnetic interference.
Electromagnetic interference waves usually have two ways of communication, and they should be paid by various means. An approach that spreads to the power line at a longer wavelength band, which is usually below 30MHz. The longer wavelength frequency attached to electronic equipment within the scope of the power cord length less than one wavelength, the quantity of the radiation to the space is little, which can be master in power line voltage, which can make full * estimate interference, the size of the this kind of noise is called conduction.
When the frequency reaches over 30 MHZ, the wavelength will also be shorter. At this time, if only the noise source voltage that occurs in the power source line is applied to the source voltage, it is not in conformity with the actual interference. Therefore, the noise is called radiation noise by means of direct determination of the noise size of interference wave * valence. The method of measuring the noise of radiation and the method of measuring the interference wave of the propagation space by the intensity of the electric field and the method to determine the power of the leakage to the power line.
Electromagnetic compatibility tests include the following:
Magnetic susceptibility
(anti-interference) devices, systems or systems exposed to electromagnetic radiation do not want to have a degree of responsiveness. The smaller the sensitivity, the higher the sensitivity and the worse the disturbance. This includes the magnetic field test of fixed frequency and peak value.
Electrostatic discharge sensitivity
The charge transfer of an object with different electrostatic potential or direct contact. 300 pf capacitor charging to - 15000 - v, through 500 次 resistance discharge. It?s super bad, but it?s normal after it?s done. After testing, data transfer and storage cannot be lost.
Power supply transient sensitivity
Including spike sensitivity (0.5, 10 mu mu s s 2 times), the transient voltage sensitivity (10% - 30%, 30 s recovery), frequency, transient sensitivity (5% - 10%, 30 s recovery).
Radiation sensitivity
A measure of the radiation interference field that causes degradation of the equipment. (14kHz - 1GHz, the field strength is 1V/M).
Sensitivity to conduction
A measure of interference signals or voltages on the power, control, or signal lines when the device is not expected to respond or degrade its performance. (30hz-50khz / 3V, 50kHz - 400MHz / 1V).
6 non-working state magnetic interference
The package is 4.6 m, and the flux density is less than 0.525 mu T. 0.9 m, 0.525 mu T.
The system interferes with the magnetic field
Upper, lower, left, right ac flux density is less than 0.5 mT.
Interference by interference
Interference along the propagation of conductors. 10khz-30mhz, 60 (48) dB mu V.
Radiation interference
Electromagnetic interference transmitted by electromagnetic waves through space. 10khz-1000mhz, 30 shielding Chambers 60 (54) mu V/m.
The latest power adapters include CEC, ERP, etc
For example, the empty load power should not be greater than 0. 3 w.
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