Converter, step-down method based on the converter and electronic device
View Patent ↗A converter includes a control chip, a switching transistor, a step-down circuit and a linear power circuit. The control chip is configured to: convert an input voltage from an external power supply module into a control voltage; when a bootstrap voltage is received, convert the bootstrap voltage into the control voltage and stop converting the input voltage; and control the switching transistor to be periodically turned on and off based on the control voltage to cause the power supply module to periodically output the input voltage to the step-down circuit. The step-down circuit is configured to generate an operating voltage based on the input voltage and outputs the operating voltage to an electrical unit and the linear power circuit. The linear power circuit is configured to convert the operating voltage into the bootstrap voltage and output the bootstrap voltage to the control chip.
1. A converter comprising:
a control chip, a switching transistor, a step-down circuit and a linear power circuit; wherein
the control chip is configured to: perform step-down conversion on an input voltage from an external power supply module to generate a control voltage; when the control chip receives a bootstrap voltage outputted from the linear power circuit, perform step-down conversion on the bootstrap voltage to generate the control voltage and stop an operation of performing the step-down conversion on the input voltage from the external power supply module to generate the control voltage; and control the switching transistor to be periodically turned on and turned off based on the control voltage to cause the external power supply module to periodically output the input voltage to the step-down circuit via the switching transistor;
the step-down circuit is configured to generate an operating voltage based on the periodically received input voltage and output the operating voltage to an external electrical unit and the linear power circuit, wherein the operating voltage is less than the input voltage; and
the linear power circuit is configured to, when the linear power circuit receives the operating voltage outputted from the step-down circuit, perform step-down conversion on the received operating voltage to generate the bootstrap voltage and output the bootstrap voltage to the control chip.
2. The converter according to claim 1 , wherein the step-down circuit comprises a freewheeling diode and an inductor coil, wherein
a cathode of the freewheeling diode is connected with an input end of the inductor coil, an anode of the freewheeling diode is grounded; and
the input end of the inductor coil is connected with the switching transistor, an output end of the inductor coil is connected with the linear power circuit and the external electrical unit.
3. The converter according to claim 2 , wherein the linear power circuit comprises a triode, a resistor, and a Zener diode, wherein
a first end of the resistor is connected with the output end of the inductor coil, a second end of the resistor is connected with a base of the triode;
a collector of the triode is connected with the output end of the inductor coil, an emitter of the triode is connected with the control chip; and
a cathode of the Zener diode is connected with the second end of the resistor, an anode of the Zener diode is grounded.
4. The converter according to claim 3 , further comprising a backflow prevention diode, wherein
an anode of the backflow prevention diode is connected with the output end of the inductor coil, and a cathode of the backflow prevention diode is connected with the collector of the triode and the resistor.
5. The converter according to claim 2 , further comprising a voltage stabilization output circuit, wherein
the voltage stabilization output circuit comprises at least one first filter capacitor; and
a positive electrode of each of the at least one first filter capacitor is connected with the output end of the inductor coil, a negative electrode of each of the at least one first filter capacitor is grounded.
6. The converter according to claim 1 , further comprising a voltage stabilization input circuit, wherein
the voltage stabilization input circuit comprises at least one second filter capacitor; and
a positive electrode of each of the at least one second filter capacitor is connected with the switching transistor, a negative electrode of each of the at least one second filter capacitor is grounded.
7. The converter according to claim 1 , wherein
the switching transistor comprises a metal oxide semiconductor MOS transistor or a triode.
8. A step-down method comprising:
S 1 , performing, by a control chip, step-down conversion on an input voltage from an external power supply module to generate a control voltage;
S 2 , controlling, by the control chip, a switching transistor to be periodically turned on and turned off based on the control voltage to cause the external power supply module to periodically output the input voltage to a step-down circuit via the switching transistor;
S 3 , generating, by the step-down circuit, an operating voltage based on the periodically received input voltage and outputting, by the step-down circuit, the operating voltage to an external electrical unit and a linear power circuit;
S 4 , performing, by the linear power circuit, step-down conversion on the received operating voltage to generate a bootstrap voltage and outputting, by the linear power circuit, the bootstrap voltage to the control chip; and
S 5 , performing, by the control chip, step-down conversion on the received bootstrap voltage to generate the control voltage and stop performing S 1 .
9. An electronic device comprising:
a power supply module, at least one electrical unit, and at least one converter, wherein
each of the at least one converter is connected with the power supply module;
each of the at least one converter is connected with at least one electrical unit; and
the power supply module is configured to provide an input voltage to each of the at least one converter,
wherein the converter comprises:
a control chip, a switching transistor, a step-down circuit and a linear power circuit wherein
the control chip is configured to: perform step-down conversion on an input voltage from an external power supply module to generate a control voltage; when the control chip receives a bootstrap voltage outputted from the linear power circuit, perform step-down conversion on the bootstrap voltage to generate the control voltage and stop an operation of performing the step-down conversion on the input voltage from the external power supply module to generate the control voltage; and control the switching transistor to be periodically turned on and turned off based on the control voltage to cause the external power supply module to periodically output the input voltage to the step-down circuit via the switching transistor;
the step-down circuit is configured to generate an operating voltage based on the periodically received input voltage and output the operating voltage to an external electrical unit and the linear power circuit, wherein the operating voltage is less than the input voltage; and
the linear power circuit is configured to, when the linear power circuit receives the operating voltage outputted from the step-down circuit, perform step-down conversion on the received operating voltage to generate the bootstrap voltage and output the bootstrap voltage to the control chip.
10. The electronic device according to claim 9 , wherein the electronic device is a server.
11. The electronic device according to claim 9 , wherein the step-down circuit comprises a freewheeling diode and an inductor coil, wherein
a cathode of the freewheeling diode is connected with an input end of the inductor coil, an anode of the freewheeling diode is grounded; and
the input end of the inductor coil is connected with the switching transistor, an output end of the inductor coil is connected with the linear power circuit and the external electrical unit.
12. The electronic device according to claim 11 , wherein the linear power circuit comprises a triode, a resistor, and a Zener diode, wherein
a first end of the resistor is connected with the output end of the inductor coil, a second end of the resistor is connected with a base of the triode;
a collector of the triode is connected with the output end of the inductor coil, an emitter of the triode is connected with the control chip; and
a cathode of the Zener diode is connected with the second end of the resistor, an anode of the Zener diode is grounded.
13. The electronic device according to claim 12 , wherein the converter further comprises a backflow prevention diode, wherein
an anode of the backflow prevention diode is connected with the output end of the inductor coil, and a cathode of the backflow prevention diode is connected with the collector of the triode and the resistor.
14. The electronic device according to claim 11 , wherein the converter further comprises a voltage stabilization output circuit, wherein
the voltage stabilization output circuit comprises at least one first filter capacitor; and
a positive electrode of each of the at least one first filter capacitor is connected with the output end of the inductor coil, a negative electrode of each of the at least one first filter capacitor is grounded.
15. The electronic device according to claim 9 , wherein the converter further comprises a voltage stabilization input circuit, wherein
the voltage stabilization input circuit comprises at least one second filter capacitor; and
a positive electrode of each of the at least one second filter capacitor is connected with the switching transistor, a negative electrode of each of the at least one second filter capacitor is grounded.