What are the components of a transistor series power supply??? How does it stabilize the output volt

The transistor B string is between the input power supply and the load RC, and the switching pulse signal is input at the base of the transistor, BG is periodically switched on and off and is in the saturation conduction and cut-off state, the diode D is similar to the resistance diode in the line output circuit, and the switching transistor is in the opposite working state, when the switching transistor BG is on, D is cut off, and when the switching tube BG is cut-off, D is turned on, so that there is continuous current flow in the load circuit, so it is called a freewheeling diode. When the base of BG input positive pulse, BG saturation conduction, voltage E is added to the negative pole of the freewheeling diode, so diode D cut-off, the input voltage E forms a loop through BG-L1-C-RC, the loop current is charged to capacitor C through L, and supplies power to RL, when BG base input is negative pulse, BG cut-off, according to the principle of electromagnetic induction, at this time the magnetic energy on L is converted into electrical energy, and the voltage generated on L is left negative and right positive, At this time, the induced voltage on D on L continues to charge the capacitor through D and also supplies the load RL current, so that the continuity of the load current is maintained due to the presence of D. Here L and C form a good filter circuit, filter out the ripples and harmonics of the switching pulse frequency in the output DC voltage.

The above is the basic working principle of series switching regulated power supply, the following we use an example to analyze it, Figure K-2 is a series switching power supply practical circuit for color TV, the switching power supply adopts the mode of self-excited oscillation, and the switching oscillation frequency is triggered by the line frequency pulse fed by the line output circuit, the self-oscillation of the circuit is taken out by the sampling circuit to take out the fluctuation component of the output DC voltage, and amplified by Q1, Q2 two-stage amplifier, ripple by high gain amplification, This oscillation is similar to a switching pulse and can be used to excite the switching transistor for turn-on and cut-off.

Magnify. Series regulated power supply, that is, a circuit that uses the adjustment tube Q1 connected in series in the circuit to dynamically divide the voltage and obtain a stable voltage for the load. The series transistor voltage regulator is a device that keeps the output voltage constant when the input voltage fluctuates, and the output voltage remains constant by using the principle that the voltage at both ends of the voltage of the regulator diode remains unchanged, and the multi-stage transistor is used to form a Darlington composite circuit to form an amplifier to improve the voltage regulation accuracy.

Summary. Hello, I am inquiring for you here, please wait a while, I will reply to you right away When the transistor sets the waveform of the one-shot voltage and the output voltage, if the DC + coupling method is used, whether the two are the same, use.

Hello, I am inquiring for you here, please wait a while, I will reply to you immediately Hello, I am happy to answer for you, when the transistor sets the waveform of the emission voltage and the output voltage, if the DC + coupling method is used, the two are the same.

Dear, the main reasons for the error are the following two points: First, the performance and parameter error of the component: the theoretical value of the design is based on the ideal components, and the actual device cannot achieve the ideal performance and parameters.

Just as you can't measure a size without error with a ruler. Second, the error generated by the measuring instrument: the Zen measuring instrument will produce errors in the process of sampling and processing to display, especially for the sampling of data, and the error cannot be avoided by the sampling rate of the data at any high frequency.

There are many other factors that cause errors, such as power supply internal resistance, line loss, etc.

Summary. The total current in the parallel circuit is equal to the sum of the currents in the branches.

2. The voltages at both ends of each branch in the parallel circuit are equal.

3. The reciprocal of the total resistance of the parallel circuit is equal to the sum of the reciprocal resistance of each branch.

4. In the parallel circuit, the current flowing through each branch is inversely proportional to its resistance.

What are the changes in the output parameters of piezoelectric crystals in parallel and series? How to choose in practical application?

The total current in the parallel circuit is equal to the sum of the currents in the branches. 2. The voltage at both ends of each branch in the parallel circuit is equal. 3. The reciprocal of the total early loss resistance of the parallel circuit is equal to the sum of the reciprocal resistance of each branch.

4. In the parallel circuit, the current flowing through each branch is inversely proportional to its resistance.

Answer Mr. Fu.

Hold on. 1) Conversion characteristics: high piezoelectric constant d33 is required;

2) Mechanical properties: high mechanical strength and stiffness;

3) Electrical properties: high resistivity and high dielectric constant to prevent breakdown when loading and driving electric field;

4) Environmental adaptability: good temperature and humidity stability, high Curie point is required, and the working temperature range is wide;

5) Time stability: The piezoelectric performance is required not to change with time, and the working stability and life of the piezoelectric material are enhanced.

Selecting parallel can reduce the voltage.

There is also a question for the teacher.

Hold on. The parameters are proportional to the increase of current and voltage.

Do you have any other answers?

It is presented in the current and voltage.

Kiss. Thank you, teacher.

The transistors in a series regulated power supply operate in the (amplified) state.

Transistor series regulated power supply is generally composed of adjustment, comparison amplification, sampling, and voltage reference. The reference voltage provides a stable reference small voltage for the comparison amplifier circuit, and the sampling circuit sends the detected voltage fluctuation into the comparison amplifier circuit, and after the difference between the reference voltage and the reference voltage is amplified, the output voltage of the adjustment tube is controlled by a secondary feedback mode to remain stable.