Switching regulator, electronic device, and electronic circuit

Patent metadata

Field	Value
Publication number	US-9543834-B2
Application number	US-201414257615-A
Country	US
Kind code	B2
Filing date	Apr 21, 2014
Priority date	Apr 26, 2013
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

There is provided a switching regulator configured to convert an input voltage into an output voltage. A control unit is configured to perform switching control in response to a result of comparison between a reference voltage and a complex voltage which includes a feedback voltage acquired by feeding back the output voltage, and a derived voltage derived on the basis of an input current.

First claim

What is claimed is:

1. A switching regulator configured to convert an input voltage into an output voltage, the switching regulator comprising:
a control unit configured to perform switching control in response to a result of comparison between a reference voltage and a complex voltage which includes a feedback voltage acquired by feeding back the output voltage, and a derived voltage derived on the basis of an input current; and
an adding unit configured to add currents,
wherein the adding unit adds a feedback current acquired by converting the feedback voltage, and the input current including an AC component and a DC component, to derive the complex voltage.

2. The switching regulator according to claim 1 , further comprising:
a transistor configured to be subjected to switching control; and
a coil connected to an output side of the transistor,
wherein the input current is a current flowing in the coil.

3. The switching regulator according to claim 2 , further comprising a comparing unit configured to compare the complex voltage and the reference voltage,
wherein the transistor is turned on in response to an edge of a clock signal having a fixed period, and is turned off in response to an output signal from the comparing unit.

4. The switching regulator according to claim 2 , further comprising a first resistor connected at a previous stage of an output terminal at the output side of the transistor,
wherein the complex voltage is a voltage at an upstream side of the first resistor.

5. The switching regulator according to claim 2 , further comprising:
a filter unit configured to pass therethrough the DC component of the input current corresponding to the DC component of the derived voltage; and
a generating unit configured to generate a first slope current whose current value increases and then decreases with time,
wherein the complex voltage includes the feedback voltage, the DC component of the derived voltage, and a voltage corresponding to the first slope current.

6. The switching regulator according to claim 5 , wherein the generating unit generates the first slope current whose current value increases at a constant slope at an ON timing of the transistor and then is reset at an OFF timing of the transistor.

7. The switching regulator according to claim 1 , further comprising a second resistor configured to derive the complex voltage on the basis of a complex current including the input current and a feedback current corresponding to the feedback voltage.

8. The switching regulator according to claim 1 , further comprising a changing unit configured to change the reference voltage in response to the current value of the input current.

9. The switching regulator according to claim 8 , wherein the changing unit increases the reference voltage in response to an increase in the DC component of the input current.

10. A switching regulator configured to convert am input voltage into an output voltage, the switching regulator comprising:
a control unit configured to perform switching control in response to a result of comparison between a reference voltage and a complex voltage which includes a feedback voltage acquired by feeding back the output voltage, and a derived voltage derived on the basis of an input current;
a changing unit configured to change the reference voltage in response to the current value of the input current; and
a filter unit configured to pass therethrough the DC component of the input current,
wherein the changing unit increases the reference voltage in response to an increase in the DC component of the input current, and
wherein the changing unit converts the DC component of the input current output from the filter unit into a voltage, and adds the voltage to the reference voltage.

11. The switching regulator according to claim 1 , further comprising a decreasing unit configured to decrease the complex voltage in response to an increase in the DC component of the input current.

12. The switching regulator according to claim 1 , further comprising:
a supplying unit configured to supply a second slope current whose current value increases and then decreases with time; and
a signal outputting unit configured to output a signal for changing a rising rate of the current value of the second slope current, in response to the voltage value of the input voltage.

13. The switching regulator according to claim 12 , wherein the signal outputting unit outputs a signal for reducing the rising rate of the current value of the second slope current, in response to a decrease in the input voltage.

14. The switching regulator according to claim 1 , further comprising a setting unit configured to set the reference voltage in response to a peak value of the input current.

15. A switching regulator configured to convert and input voltage into an output voltage, the switching regulator comprising:
a control unit configured to perform switching control in response to a result of comparison between a reference voltage and a complex voltage which includes a feedback voltage acquired by feeding back the output voltage, and a derived voltage derived on the basis of an input current;
a setting unit configured to set the reference voltage in response to a peak value of the input current, and
a supplying unit configured to supply a slope current whose current value increases and then decreases with time, to the complex voltage,
wherein the setting unit sets the reference voltage in response to a peak value of the input current and a peak value of the slope current.

16. The switching regulator according to claim 15 , wherein the setting unit adds the peak value of the input current and the peak value of the slope current to a reference power supply voltage having a predetermined voltage value, to set the reference voltage.

17. The switching regulator according to claim 14 , further comprising an acquiring unit configured to acquire a peak value of a current,
wherein the acquiring unit acquires the peak value in one cycle from ON to OFF of the switching control, and resets the peak value having been acquired in the previous cycle, thereby acquiring the peak value of the present cycle.

18. An electronic device comprising:
the switching regulator according to claim 1 ; and
a control device that receives the voltage of the switching regulator, thereby operating.

19. An electronic circuit configured to convert an input voltage into an output voltage, the electronic circuit comprising:
a control unit configured to perform switching control in response to a result of comparison between a reference voltage and a complex voltage which includes a feedback voltage acquired by feeding back the output voltage, and a derived voltage derived on the basis of an input and
an adding unit configured to add currents
wherein the adding unit adds a feedback current acquired by converting the feedback voltage, and the input current including an AC component and a DC component to derive the complex voltage.

Assignees

• Fujitsu Ten Ltd

Inventors

• Izumoto Ryoh
• Koyama Kiyoshi

Classifications

• H02M3/156 Primary

  with automatic control of output voltage or current, e.g. switching regulators · CPC title

• G05F1/46

  wherein the variable actually regulated by the final control device is DC (G05F1/625 takes precedence) · CPC title

• H02M2001/0009

  Electricity · mapped topic

• H02M1/0009

  Devices or circuits for detecting current in a converter · CPC title