F495 transistor amplifier
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BUD616A - Silicon NPN High Voltage Switching Transistor 硅npn型高压开关晶体管 From old datasheet system
When the switch is closed, energy is transferred from mains to the transformer. This energy is supplied to the load when the switch is opened. Through control of the switched-on time, the energy transferred in each cycle is regulated so that the output voltages are independent of load or input voltage variations. The controlling device UC is an integrated pulse width modulator. A clock signal initiates power pulses at a fixed frequency. The termination of each output pulse occurs when a feedback signal of the inductor current reaches a threshold set by the error signal.
In this way the error signal actually controls the peak inductor current on cycle-by cycle basis. The error amplifier compares a voltage Vfb pin 2 related to the output voltage of the power supply, with an internal 2. The current sense comparator compares the output of the error amplifier with the switch current Isense pin 3 of the power supply. The output of the current sense comparator resets a latch, which is set every cycle by the oscillator. The output is switched off During t1. The current consumption of the circuit increases to about 17mA, depending on the external loads of the IC.
At first, the. Faultfinding Guidebecomes reversed. This results in a current flow through the tranformers secondary winding via the diodes, electrolytic capacitors and the load. This current is also ramp shaped but decreasing. TimeDEAD phase : when the stored energy has been supplied to the load, the voltage from the secondary windings falls below the output voltage held constant by the electrolytic capacitors plus the threshold voltage of the diodes.
The current in the secondary winding stops flowing. This charge will start a sine-shaped ringing together with the transformers self-induction. The oscillator will start a next cyclus which consists of the described three phases. The time of the different phases depends on the mains voltage and the load. V2 Vosc. At some moment during t2, the primary auxiliary voltages reaches the same level as Vcc. This primary auxiliary voltage now determines the Vcc voltage t3: regulation The output voltage of the power supply is in regulation t4: overload When the output is shortened, the supply voltage of the circuit will decrease and after some time drop below the lower threshold voltage.
At that moment, the output will be disabled and the process of charging the Vcc capacitor starts again. If the output is still shorted at the next t2 phase, the complete start-and stop sequence will repeat. The power supply comes in a hiccup mode. Figure 8. The oscillator voltage ramps up and down between V1 and V2. The voltage at the current sense terminal is compared every cycle with the output of the error amplifier Vcomp.
The output is switched off when the current sense level exceeds the level at the output of the error amplifier. As the positive voltage at pin 1 of the transformer is constant, the current will increase linearly and create a ramp dependent on the mains voltage and the inductance of the primary winding. A certain amount of energy is stored in the transformer in the form of a magnetic field.
The polarity of the voltages at the secundary windings is such that the diodes are non-conducting. The inductance of the tranformer now tries to maintain the current which has been flowing through it at a constant level. The polarity of the voltage from the transformer therefore. Input circuit The input circuit consists of a lightning protection circuit and an EMI filter. The lightning protection comprises R, gasarrestor and R The voltage over C is approximately V.
It can vary from V to V. When the power plug is connected to the mains voltage, the stabilised voltage over D 24V will charge C via R When the voltage reaches 14,5V across C, the control circuit of IC is turned on and the regulation starts. During regulation, Vcc of IC will be supplied by the rectified voltage from winding via L, D and C C and R define the frequency of the oscillator.
Regulation circuit The regulation circuit comprises opto-coupler which isolates the error signal from the control IC on the primary side and a reference component The TL can be represented by two components: a very stable and accurate reference diode a high gain amplifier.
TL will conduct from cathode to anode when the reference is higher than the internal reference voltage of about 2. If the reference voltage is lower, the cathode current is almost zero.
The cathode current flows through the LED of the optocoupler. The collector current of the opto-coupler flows through R, producing an error voltage, connected to voltage feedback pin 14 of IC Each voltage depends on the number of windings of the transformer.
The -8V supply is regulated by voltage regulator IC is switched off. When the regulation circuit is interrupted due to an error in the control loop, the regulated output voltage will increase overvoltage. This overvoltage is sensed on the primary winding When an overvoltage longer than 2. The power supply will come in a hiccup mode as long as the error in the control loop is present. Log in Get Started. See Full Reader. Download Report this document.
Embed Size px x x x x GB 59 8. At first, the GB 60 8. CDR Faultfinding Guidebecomes reversed. V2 Vosc capacitor at the Vcc pin will discharge because the primairy auxiliary voltage, coming from winding is below the Vcc voltage.
The polarity of the voltage from the transformer therefore Figure Faultfinding Guide8. GB 62 8. IC is switched off When the regulation circuit is interrupted due to an error in the control loop, the regulated output voltage will increase overvoltage.
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