Switching power supply unit and starting circuit
A technology of switching power supply and starting circuit, which is applied in the direction of output power conversion device, electrical components, and adjustment of electric variables, etc., to achieve the effect of stabilizing the operating voltage
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no. 1 Embodiment approach ）
[0041] refer to figure 1 , The switching power supply device of the first embodiment includes: a capacitor C1; a starting circuit 1a; a transformer T having a primary winding P1, a secondary winding S1, and a tertiary winding P2; a switching element Q10 made of, for example, a MOSFET; The resistance R10 of passing current; The control circuit 3a that controls the on-off of the switching element Q10; The 1st rectification smoothing circuit that is made up of diode D11 and capacitor C11; The 2nd rectification smoothing circuit that is made up of diode D10 and capacitor C10; And Detection circuit 7.
[0042] In the switching power supply device of the first embodiment, the Figure 6 The conventional switching power supply device shown differs only in the configurations of the starting circuit 1a and the control circuit 3a, and only the configurations and operations of the starting circuit 1a and the control circuit 3a will be described below.
[0043] The starting circuit 1 a i...
no. 2 Embodiment approach ）
[0065] refer to Figure 4 The starting circuit 1b of the switching power supply device according to the second embodiment includes a diode D2 and a Zener diode ZD4 in addition to the configuration of the starting circuit 1a of the switching power supply device according to the first embodiment. The diode D2 is connected in series with the Zener diode ZD2, and is connected between the anode of the Zener diode ZD2 and the anode of the diode D1. Zener diode ZD4 is connected between the connection point of the anode of Zener diode ZD2 and the anode of diode D2, and the ground terminal GND of control circuit 3a. In addition, Zener voltage VZ4 of Zener diode ZD4 is set to a voltage value higher than activation voltage Von (for example, 18V) of control circuit 3a, and operates as second threshold voltage V2.
[0066] By setting diode D2 and Zener diode ZD4, such as Figure 5 As shown, when the power supply voltage Vcc exceeds the second threshold voltage V2 at time t14, the current...
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