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Control circuit and boost circuit

A technology of control circuit and boost circuit, applied in the direction of control/regulating system, electrical components, regulating electrical variables, etc., can solve the problem of output voltage hook or step of DC-DC boost converter, so as to improve the output voltage Effect

Active Publication Date: 2021-09-03
深圳市拓尔微电子有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present application provides a control circuit and a boost circuit, which are used to solve the problem that the output voltage of the DC-DC boost converter has a rebound or a step phenomenon

Method used

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  • Control circuit and boost circuit
  • Control circuit and boost circuit
  • Control circuit and boost circuit

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Experimental program
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Embodiment Construction

[0054] In the current DC-DC boost converter, the charging time and discharging time of the inductor remain unchanged. In the process of discharging the inductor, after the output voltage of the DC-DC boost converter is higher than the input voltage, the discharging speed of the inductor becomes slower. , the energy released when the inductor discharges is less than the energy released when the output voltage is lower than the input voltage, so the remaining energy of the inductor will gradually increase after each discharge. During each charging process of the inductor, the energy stored in the inductor continues to increase. When the inductor current is too large, the phenomenon of inductor current overshoot will occur, and the output voltage will rise rapidly. When this phenomenon is detected, the DC-DC boost converter adjusts according to the loop response, reducing the charging time of the inductor and increasing the discharging time of the inductor, so that the average cur...

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Abstract

The application provides a control circuit and a boost circuit, which relate to the field of circuit technology. The control circuit includes: a pulse width modulation sub-module, an oscillator and a logic sub-module; the pulse width modulation sub-module is used to adjust The pulse width modulation wave output by the pulse width modulation sub-module, the oscillator is used to adjust the clock signal output by the oscillator according to the received second feedback signal, and the logic sub-module is used to control the boost circuit according to the pulse width modulation wave and clock signal The on-off state of the NMOS in the middle, and adjust the on-time of the PMOS in the boost circuit. In the technical solution provided by this application, the control circuit adjusts the conduction time of PMOS and NMOS, so that before and after the output voltage is higher than the input voltage than the preset voltage threshold, the discharge amount of the inductor when the PMOS is turned on is the same as that of the inductor when the NMOS is turned on. The charging amount is the same, that is, the average current of the inductor remains unchanged, so that the output voltage can be increased smoothly.

Description

technical field [0001] The present application relates to the field of circuit technology, in particular to a control circuit and a boost circuit. Background technique [0002] The battery supply voltage of portable equipment is constantly developing towards low voltage, and some functions of portable equipment still require high voltage power supply. Therefore, DC (direct current)-DC boost converters are usually used in portable equipment to convert the low voltage of the battery supply voltage to high voltage. Voltage. [0003] In the related art, the DC-DC boost converter can adopt BOOST topology circuit, see figure 1 , shows the waveform diagram of the input voltage (Vin) and output voltage (Vout) of the DC-DC boost converter. When the output voltage of the DC-DC boost converter is lower than the input voltage, the output voltage rises smoothly. In When the output voltage is higher than the input voltage, the inductor discharge rate becomes slower. However, due to the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/158H02M1/088H02M1/36
CPCH02M1/083H02M1/088H02M1/36H02M3/158
Inventor 王红义毛豪
Owner 深圳市拓尔微电子有限责任公司