JP-7855070-B2 - Switching regulator

Inventors

• 丹治 景斉

Assignees

• 日清紡マイクロデバイス株式会社

Dates

Publication Date

20260507

Application Date

20220607

Claims (10)

1. A switching circuit that switches the input voltage and outputs a switching voltage based on a predetermined gate control signal, A voltage difference detector that outputs a comparison result signal by comparing the switching voltage with a threshold voltage dependent on the input voltage, A switching regulator comprising a control circuit that generates the gate control signal based on the output voltage, which is a smoothed switching voltage that is fed back, and the comparison result signal, and outputs it to the switching circuit, The voltage difference detector is An integrating circuit that generates and outputs a pseudo-output voltage which is substantially equal to the output voltage, obtained by integrating the switching voltage over time, The system includes a comparator circuit that compares the pseudo-output voltage with a threshold voltage dependent on the power supply voltage and outputs a comparison result signal. Switching regulator.
2. The aforementioned comparator circuit includes two MOS transistors connected in series. A switching regulator according to claim 1.
3. The comparator circuit has hysteresis characteristics and includes four MOS transistors connected in series. A switching regulator according to claim 1.
4. The comparator circuit includes an inverter and an output capacitor connected downstream of the inverter. A switching regulator according to claim 1.
5. The comparator circuit includes a comparator that compares the voltage corresponding to the input voltage with the time-integrated voltage and outputs a comparison result signal. A switching regulator according to claim 1.
6. The voltage corresponding to the input voltage is a voltage obtained by level-shifting the input voltage. The switching regulator according to claim 5.
7. The comparator circuit includes a constant current inverter circuit. A switching regulator according to claim 1.
8. The switching regulator is a switching regulator using a voltage control method, a current control method, or a hysteresis control method. A switching regulator according to claim 1.
9. The switching regulator is a boost-type or buck-boost switching regulator. A switching regulator according to claim 1.
10. The switching regulator controls its operation by monitoring the input voltage and the output voltage. A switching regulator according to claim 1.

Description

The present invention relates to a switching regulator, which is applied, for example, to a power conversion device. Conventionally, it is already known that switching regulators use specific sequences when the input-output voltage difference is small, such as in battery-through mode. For example, Patent Document 1 discloses a conventional switching converter that improves the conversion efficiency during DC-DC conversion by providing a drive unit for each of the multiple switches and controlling each switch according to the load current, input voltage, output voltage, and input/output voltage. The conventional switching converter is characterized in that, when synchronously rectifying by alternately turning on a plurality of first switches and a plurality of second switches, it repeatedly drives the plurality of first switches to an on or off state according to the required output, drives the plurality of second switches to an on or off state in synchronization with the first switches, and stops the driving of some of the plurality of first switches and some or all of the plurality of second switches according to the load current, output voltage, input voltage, or input/output voltage difference. Japanese Patent Publication No. 2006-296186 This is a circuit diagram showing an example configuration of the switching regulator 1 according to Embodiment 1.Figure 1 is a circuit diagram of an example configuration showing the operation of the voltage difference detector 20 of the switching regulator 1.Figure 1 shows the timing chart of each signal when the PWM method is used in the switching regulator 1.Figure 1 shows the timing chart of each signal when the PFM method is used in the switching regulator 1.This is a circuit diagram showing an example configuration of the voltage difference detector 20A according to Modification 1.This is a circuit diagram showing an example configuration of the voltage difference detector 20B according to modified example 2.This is a circuit diagram showing an example configuration of the voltage difference detector 20C according to modified example 3.This is a circuit diagram showing an example configuration of the voltage difference detector 20D according to modified example 4.This is a circuit diagram showing an example configuration of the voltage difference detector 20E according to modified example 5.This is a circuit diagram showing an example configuration of the switching regulator 1A according to Embodiment 2.This is a circuit diagram showing an example configuration of the switching regulator 1D according to Embodiment 3.This is a circuit diagram showing an example configuration of the switching regulator 1E according to Embodiment 4.This is a circuit diagram showing an example configuration of the switching regulator 1F according to Embodiment 5.This is a circuit diagram showing an example configuration of the switching regulator 1G according to Embodiment 6.This is a circuit diagram showing an example configuration of the switching regulator 1H according to Embodiment 7.This is a circuit diagram showing an example configuration of the switching regulator 1I according to Embodiment 8.This is a circuit diagram showing an example configuration of the switching regulator 1J according to Embodiment 9.This is a circuit diagram showing an example configuration of a switching regulator 1K according to Embodiment 10.This is a circuit diagram showing an example configuration of the switching regulator 1L according to Embodiment 11.This is a circuit diagram showing the configuration of the input/output voltage monitoring circuit 101 according to Comparative Example 1.This is a circuit diagram showing the configuration of the input/output voltage monitoring circuit 102 according to Comparative Example 2.This is a circuit diagram showing the configuration of the switching regulator 103 according to Comparative Example 3.This is a circuit diagram showing the configuration of the switching regulator 104 according to Comparative Example 4. Embodiments and modified examples of the present invention will be described below with reference to the drawings. The same or similar components are denoted by the same reference numerals. (Inventor's insights) (Comparative Example 1) Figure 20 is a circuit diagram showing the configuration of the input/output voltage monitoring circuit 101 according to Comparative Example 1. In Figure 20, the input/output voltage monitoring circuit 101 is configured to include two differential amplifiers 111 and 112 and a selector 113. In the input/output voltage monitoring circuit 101 configured as described above, the input voltage VIN, which is the power supply voltage input to the input terminal T1, is input to the non-inverting input terminal of the differential amplifier 111. The differential amplifier 111 amplifies the difference voltage between the input voltage VIN and the first reference voltage Vre1 from the reference voltage source 121 and outputs it