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Voltage conversion control circuit and voltage converter

A technology of voltage converters and control circuits, applied in control/regulation systems, output power conversion devices, instruments, etc., can solve problems such as low power conversion efficiency, reduce input voltage dependence, reduce buzzing, Reduce the effect of wrong actions

Active Publication Date: 2017-05-24
SANKEN ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, many step-down chopper circuits continue to switch even under light load conditions such as standby, so the lighter the load, the lower the power conversion efficiency.

Method used

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  • Voltage conversion control circuit and voltage converter
  • Voltage conversion control circuit and voltage converter
  • Voltage conversion control circuit and voltage converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] An embodiment of the present invention provides a voltage converter, and a DC / DC converter is taken as an example for description. Figure 6 is a schematic diagram of the composition of the voltage converter of the embodiment of the present invention, such as Figure 6 As shown, the voltage converter 600 includes:

[0071] a switching element 601, which is turned on (ON) / off (OFF) to convert the input voltage into the output voltage;

[0072] an error amplifier 602, which amplifies an error between a feedback voltage corresponding to the output voltage and a reference voltage, and outputs an error amplification signal;

[0073] A current detection circuit 603, which detects the current flowing into the switching element and outputs a current signal;

[0074] an oscillator 604, which outputs a set pulse of a prescribed frequency;

[0075] a current comparator 605, which compares the error amplification signal with the current signal, and outputs a reset signal to turn...

Embodiment 2

[0106] An embodiment of the present invention provides a voltage converter, which converts a first direct current voltage into a second direct current voltage through a switch of a switching element according to a driving signal generated by a control circuit. The present invention will be described in detail on the basis of Example 1 below.

[0107] Figure 8 is a schematic circuit diagram of the voltage converter of the embodiment of the present invention, such as Figure 8 As shown, the voltage converter includes: oscillator 1, SR flip-flop 2, AND circuit 3, high-side driver 4, drive REG circuit 5, backflow prevention diode 6, bootstrap capacitor 7, high-side MOSFET 8, inductor 9, output Capacitor 10, Output Load 11, Feedback Resistor 12, Feedback Resistor 13, Error Amplifier 14, Phase Compensation Resistor 15, Phase Compensation Capacitor 16, PWM Comparator 17, Inverter 18, NOR Circuit 19, Low Side Driver 20, Low Side MOSFET 21 , zero-crossing detection circuit 22 , ligh...

Embodiment 3

[0144] An embodiment of the present invention provides a voltage converter. On the basis of Embodiment 2, the embodiment of the present invention not only adds a switch 29 b, but also adds a tilt signal adding circuit 31 . The same content as in Embodiment 2 will not be repeated here.

[0145] Figure 15 is a schematic circuit diagram of the voltage converter of the embodiment of the present invention, such as Figure 15 shown, with Figure 8 Compared with the circuit shown, the switch 29 is changed to a switch 29b, and a slope adding circuit 31 is added.

[0146] Figure 16 yes Figure 15 A timing diagram of the current or voltage of each node in the circuit shown as a function of time. Figure 17 It is a schematic diagram of the current or voltage change of the embodiment of the present invention; it not only shows the change of the peak current of the inductor, the intermittent oscillation frequency and the output ripple voltage with the increase of the input voltage,...

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PUM

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Abstract

The embodiment of the invention provides a voltage conversion control circuit and a voltage converter. The control circuit is composed of an error amplifier, a current detection circuit, a current comparator, an inductor, and a tilt signal overlapping unit. A tilt signal is overlapped with the output of the current detection circuit when the current of the inductor generates subharmonic vibration; and during the intermittent vibration period with no subharmonic vibration generated by the current of the inductor, overlapping of the tilt signal with the output of the current detection circuit is forbidden. Therefore, dependency of the input voltage of the peak current of the inductor during the intermittent vibration operation can be reduced.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of electronic circuits, and in particular, to a control circuit for voltage conversion and a voltage converter. Background technique [0002] As a method of generating a stable output voltage lower than the input voltage, non-isolated step-down chopper circuits such as DC / DC (Direct Current / Direct Current) circuits are widely used. However, many step-down chopper circuits continue to switch even under light load conditions such as standby, so the lighter the load, the lower the power conversion efficiency. [0003] To solve the above-mentioned problems, some schemes detect a light load condition based on an error signal generated by comparing the output voltage with a reference voltage. After reaching the light load state, along with the reduction of the load current, the switching loss and the gate drive current of the switching transistor are reduced by reducing the switching frequen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155
Inventor 中村胜
Owner SANKEN ELECTRIC CO LTD