The function of the power transformer is power transmission, voltage transformation and insulation isolation. As a major soft magnetic electromagnetic element, it is widely used in power technology and power electronic technology.The following editors will introduce relevant knowledge to you!
Electronic transformers parts of each part
The electronic transformers used in the general store in light, the electronic transformer, etc. used for 220V, the DC 12V50W, which contains a magnet coil with 7 wiring headers.3 resistors, 6 second -level pipes, 4 capacitors, 2 triode.Its effects are: resistance: 1 start resistance, 2 current limits resistance, 3 regulatory resistance diode: There are four diode for rectification, and the remaining two are also rectified capacitors: filter triode: one is the switching triode, the other is the other isThe function and calculation formula of the inductance used for starting L = μN*NS/L (2-108) where: L: the inductance of the transformer coil [H] L: the average length of the transformer iron core magnetic circuit [m] n: the coil of the coilTurn S: the cross -sectional area of ??the transformer iron core magnetic circuit [m2] μ: The conductivity of the iron core of the transformer [h/m]
First, when the same number is smashed: To make the inductance high or low, depending on the selected magnetic core material.For example, the same is 10 smashed, the magnetic conduct rate is basically 10 times from 1K ~ 10K, and the amount of inductance changes is basically 10 times, but you will find that the nature of various materials will fall sharply with the increase of magnetic guidance rates, or the temperature will fall sharply, or orLosses will rise suddenly, there are always other parameters that make you consider that the magnetic guidance rate cannot be blindly high, so other factors may become the main contradiction at this time, and you have to weigh it.Under the case.For example, 1: 2, 2: 4, 4: 8, 20: 40 can be selected. Which one is selected? Under the selected material, it may be only 4: 8. In this turn, the inductance can satisfy the customer.The lowest value given can also ensure the least copper loss, etc., etc., and less than this turn. It may have too much leakage, more than this turn, and may be too severe.: The corresponding materials may be related to the high and low inductance, which is related to the magnetic guidance rate of the material to a certain extent. Generally speaking, the material with a high magnetic guidance rate has a small saturation magnetic induction strength;, Resulting in maximizing the internal magnetic moment of the material.
Classification introduction of electronic transformer principles
Principles of self -exciting oscillating work
The principle of electronic transformer is similar to the working principle of the switching power supply. The diode VD1 ~ VD4 constitutes a rectifier bridge to turn the citys electricity into a DC, which consists of a high -frequency oscillating circuit composed of oscillation transformer T1, triode VT1, VT2, and turning the pulse to high -frequency current, and thenThe high -frequency high -voltage pulse is lowered by the iron oxygen output transformer T2, and the required voltage and power is obtained.R1 is a current -limiting resistor.Resistance R2, capacitor C1, and two -way trigger diode VD5 to make a start -trigger circuit.The triode VT1 and VT2 use S13005, and B is 15 to 20 times.You can also use BUCEO> = 35OV high -power triode with C3093.Trigger the DB3 or VR60 with a diode VD5.The oscillating transformer can be made by self -made, and the audio cable is winding on the magnetic ring of H7X10X6.Tia and T1B around 3 turns, TC 1 turning around.The iron oxygen output transformer T2 also needs to be self -made, and the magnetic heart uses an EI -type iron oxygen body with a edge length of 27mm, 20mm wide, and 10mm thick.The T2A uses a diameter of 0.45mm high -intensity lacquer cable to surround 100 turns, and the T2B has a diameter of 1.25mm high -intensity paint cable around 8 turns.The diode VD1 ～ VD4 uses IN4007, and the diode is triggered by the diode. The DB3 type is used.When the circuit works, the working voltage of point A is about 12V; point B is about 25V; point C is about 105V; point D is about 10V.
If the voltage does not meet the above values, or the circuit does not oscillate, check the circuit whether there is any error welding, leakage or virtual welding.Then check whether the VT1 and VT2 are good, and whether the phase of the T1A and T1B is correct.After the entire circuit is successfully installed, it can be installed in a small box made of metal materials, which is good for shielding and heat dissipation, but it must be noted that the insulation of the circuit and the shell.In addition, if the number of turns of T2A and B two coils can change the output high -frequency voltage.
His exciting working principle
After the aggressive electronic transformer connects the power supply of the Gongbo City, the bridge rectifier is charged by most currents to the capacitor CVCC1 by flowing into the start current on the IC foot VCC through the RS current.When the voltage on the IC foot VCC reaches the starting threshold (11.8V), IC starts working.Once the IC starts, the charge pump circuit consisting of CSNUB, DCP1 and DCP2 is the IC foot VCC feed current.Self -lifting diode DB and capacitor CB to power the IC high -side drive circuit.The Qina diode DZ is used as a diversion IC excess current to prevent IC damage.The halogen lamp wire resistor is a positive temperature coefficient, and the "cold resistance" at room temperature is far less than the "thermal resistance" when the lamp works.When the light is activated, a large wave current will produce a large waves, affecting the life of the lamp.However, IR2161 provides a soft startup operation to avoid surge current.During the lamp activity, IR2161 outputs 125kHz high frequency.Because the output high -frequency transformer T1 in the system is fixed, high impedance at a higher frequency, the voltage on the primary winding is low. As a result, the transformer output voltage is lower, the light current is small, and at the same time, it is avoided to avoidThe protection circuit is triggered.At about 1S, the circuit runs at a lower frequency.In the process, the voltage on the IC foot 3 external capacitor CSD increased from OV to 5V.When empty load, VCSD = OV, the oscillator frequency is about 60kHz.Under the maximum load, VCSD = 5V, the frequency of the oscillator is about 30kHz.When the output is short -circuited, the large current flows over half of the bridge and is sensing by RCS.As long as the IC foot 4 (CS) voltage exceeds 1V, the limits level of more than 1V lasts more than 50ms, the system will be closed.If the load exceeds 50%of the maximum load, the voltage on the IC feet 4 will exceed the lower cricket voltage with a lower O5V. After 0.5s, the system will be closed.Whether it is short -circuit or overloading, it can automatically reset.IR2161 also provides overheating closing function.When the chip knot temperature exceeds 135 ° Cs too temperature limit value, the half -bridge switch will stop working to avoid MOSFET burn out.The power supply device of the relationship and calculation in the power supply technology, whether it is DC power supply or AC power supply, uses an electronic transformer (soft magnetic electromagnetic element) made of soft magnetic core.Although there are already air -core electron transformers and piezoelectric ceramic transformers without soft magnetic cores, so far, electronic transformers in most power devices still use soft magnetic cores.
Therefore, the relationship between the power supply technology and the electronic transformer: the role of electronic transformers in power technology, power supply technology on electronic transformers, electronic transformers adopt the impact of new soft magnetic materials and new magnetic core structures on the development of power technology.It will cause friends in the power supply industry and the soft magnetic material industry.Some views are put forward to promote the dialogue between electronic transformers and soft magnetic materials between the power supply industry and the electronic transformer industry and the soft magnetic material industry, communicate with each other, and develop together.
Electronic transformer working principle
The working principle is similar to the switching power supply. The diode VD1 ~ VD4 constitutes the rectifier bridge to turn the city power into DC power. The high -frequency oscillating circuit consisting of oscillation transformer T1, triode VT1, VT2 will turn the pulse DC into a high -frequency current, and then the iron oxygenThe body output transformer T2 lowers high -frequency and high -voltage pulse, and obtains the required voltage and power.R1 is a current -limiting resistor.Resistance R2, capacitor C1, and two -way trigger diode VD5 to make a start -trigger circuit.The triode VT1 and VT2 use S13005, and B is 15 to 20 times.You can also use BUCEO> = 35OV high -power triode with C3093.Trigger the DB3 or VR60 with a diode VD5.The oscillating transformer can be made by self -made, and the audio cable is winding on the magnetic ring of H7X10X6.Tia and T1B around 3 turns, TC 1 turning around.The iron oxygen output transformer T2 also needs to be self -made, and the magnetic heart uses an EI -type iron oxygen body with a edge length of 27mm, 20mm wide, and 10mm thick.The T2A uses a diameter of 0.45mm high -intensity lacquer cable to surround 100 turns, and the T2B has a diameter of 1.25mm high -intensity paint cable around 8 turns.The diode VD1 ～ VD4 uses IN4007, and the diode is triggered by the diode. The DB3 type is used.
When the circuit works, the working voltage of point A is about 12V; point B is about 25V; point C is about 105V; point D is about 10V.If the voltage does not meet the above values, or the circuit does not oscillate, check the circuit whether there is any error welding, leakage or virtual welding.Then check whether the VT1 and VT2 are good, and whether the phase of the T1A and T1B is correct.After the entire circuit is successfully installed, it can be installed in a small box made of metal materials, which is good for shielding and heat dissipation, but it must be noted that the insulation of the circuit and the shell.In addition, if the number of turns of T2A and B two coils can change the output high -frequency voltage.

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