Method for stabilized-voltage output of push-pull circuit and power converter thereof
A push-pull circuit, voltage output technology, applied in the direction of adjusting electrical variables, instruments, electrical components, etc., can solve the problems that the power converter cannot achieve stable output, the parasitic parameters of components are sensitive, and the production consistency is poor, so as to solve the problem of production Poor consistency, stable voltage output characteristics, and the effect of expanding application fields
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Embodiment approach 1
[0025] Embodiment 1, such as image 3 As shown, its circuit mainly includes two components: the first part is a push-pull circuit controlled by a fixed frequency and fixed pulse width drive chip IC (such as figure 2 shown), the push-pull circuit is mainly composed of windings T1-1, T1-2, T1-3, T1-4 of the transformer, switch tubes Q1, Q2, diodes D1, D2, capacitor C1 and the connection of the fixed frequency drive chip ; The second part is a feedback circuit for controlling the stability of the output voltage. The feedback circuit mainly includes sampling resistors R1, R2, PWM control chip, pulse transformer Tdrive, and switch tube Q3.
[0026] After the sampling resistors R1 and R2 are connected in series, they are connected to both ends of the voltage output capacitor C1 of the push-pull circuit. The series point of the resistors R1 and R2 outputs the sampled voltage, and the sampled voltage is input to the corresponding input terminal of the PWM control chip, and the PWM co...
Embodiment approach 2
[0028] Implementation mode two, such as Figure 4 As shown, the principle is basically the same as that of Embodiment 1. The main difference is that the way of controlling the intermittent operation of the primary side is not to directly cut off the main power circuit of the primary side through the switch tube Q3, but to cut off the power supply of the drive chip with a fixed frequency and a fixed pulse width. The loop also achieves the purpose of allowing the primary side to work intermittently. At the same time, because the switch tube Q3 is connected to the main power loop in the first embodiment, it is connected to the power supply load of the drive chip with a fixed frequency and a fixed pulse width. end, so work more efficiently. Figure 5 The drain of the switching tube Q3 is grounded, the source of the switching tube Q3 is connected to the negative power supply terminal of the constant frequency and pulse width driver chip, and the power supply reference terminal of t...
Embodiment approach 3
[0029] Implementation mode three, such as Figure 5 As shown, the basic principle is the same as that of Embodiments 1 and 2, the difference is that the intermittent operation of the primary side is controlled by the switch tube Q3, and the source of the switch tube Q3 is connected to the enable terminal of the primary side drive IC with a fixed frequency and a fixed pulse width. . The enable terminal has the following functions: when the enable terminal is suspended, the constant frequency and constant pulse width drive chip will normally output the signals for driving the switch tubes Q1 and Q2, but if the enable terminal is grounded, the constant frequency and constant pulse width drive chip will not Output signals for driving switch tubes Q1 and Q2. The advantages of this embodiment are: 1) Same as Embodiment 2, the switching tube Q3 is not connected to the main power circuit in this scheme, and the circuit control efficiency is high; 2) It is better than Embodiment 2 in ...
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