A switching power converter circuit configured to be connected to a voltage source and configured to supply a high output voltage and a lower output voltage comprising: a control voltage regulation circuit configured to output a predetermined control voltage, the control voltage regulation circuit including: a first Zener diode configured to clamp the control voltage to a predetermined value, and a first resistor configured to limit a discharge current, wherein the first resistor is coupled in parallel with the first Zener diode; a second Zener diode coupled to a voltage node; a second resistor coupled between the voltage node and the voltage source; a third resistor coupled between the first Zener diode and the voltage node; and a capacitor coupled to the voltage node; a control switch; a control circuit powered by the lower output voltage received from an output capacitor at a first node and configured to control the operation of the control switch in response to a timing signal provided by a timing reference circuit; an inductor; a first rectifying diode a second rectifying diode; a charging switch, including a drain terminal coupled to the inductor and an anode of the first rectifying diode at a high voltage node, a source terminal coupled to the second rectifying diode at a second node and a control terminal to which the predetermined control voltage is applied, wherein the first Zener diode is coupled to the control terminal of the charging switch; wherein the control switch has a gate coupled to the output of the control circuit, and a drain coupled to the second node; whereby, when the control switch is switched off, an inductor current through the inductor charges parasitic capacitances (Cd3, Cgd, Ggs, Cds) associated with the charging switch and control switch; whereby when the timing signal turns the control switch off, charge on a parasitic capacitance raises a voltage at the control terminal of the charging switch to an elevated level such that a charging current flows through the control switch and through the second rectifying diode, into the output capacitor; and whereby the first resistor of the control voltage regulation circuit limits a discharge current of the parasitic capacitance, such that the charging switch control terminal voltage is reduced from the elevated voltage level to the predetermined control voltage over a predetermined duration. a control voltage regulation circuit configured to output a predetermined control voltage, the control voltage regulation circuit including: a first Zener diode configured to clamp the control voltage to a predetermined value, and a first resistor configured to limit a discharge current, wherein the first resistor is coupled in parallel with the first Zener diode; a second Zener diode coupled to a voltage node; a second resistor coupled between the voltage node and the voltage source; a third resistor coupled between the first Zener diode and the voltage node; and a capacitor coupled to the voltage node; a first Zener diode configured to clamp the control voltage to a predetermined value, and a first resistor configured to limit a discharge current, wherein the first resistor is coupled in parallel with the first Zener diode; a second Zener diode coupled to a voltage node; a second resistor coupled between the voltage node and the voltage source; a third resistor coupled between the first Zener diode and the voltage node; and a capacitor coupled to the voltage node; a control switch; a control circuit powered by the lower output voltage received from an output capacitor at a first node and configured to control the operation of the control switch in response to a timing signal provided by a timing reference circuit; an inductor; a first rectifying diode a second rectifying diode; a charging switch, including a drain terminal coupled to the inductor and an anode of the first rectifying diode at a high voltage node, a source terminal coupled to the second rectifying diode at a second node and a control terminal to which the predetermined control voltage is applied, wherein the first Zener diode is coupled to the control terminal of the charging switch; wherein the control switch has a gate coupled to the output of the control circuit, and a drain coupled to the second node; whereby, when the control switch is switched off, an inductor current through the inductor charges parasitic capacitances (Cd3, Cgd, Ggs, Cds) associated with the charging switch and control switch; whereby when the timing signal turns the control switch off, charge on a parasitic capacitance raises a voltage at the control terminal of the charging switch to an elevated level such that a charging current flows through the control switch and through the second rectifying diode, into the output capacitor; and whereby the first resistor of the control voltage regulation circuit limits a discharge current of the parasitic capacitance, such that the charging switch control terminal voltage is reduced from the elevated voltage level to the predetermined control voltage over a predetermined duration.