DC voltage-boosting chopper circuit

A chopper circuit, DC boost technology, applied in the direction of converting DC power input to DC power output, electrical components, adjusting electrical variables, etc., can solve the problem of inability to meet the requirements of power supply voltage, poor versatility, and inability to continuously adjust the output voltage range and other problems, to achieve the effect of wide adjustable range, small step and high precision

Inactive Publication Date: 2014-06-04
LIANCHUANG AUTOMOBILE ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing DC boost chopper circuit (the boost converter) cannot continuously adjust the output voltage r

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0029] Example one

[0030] The DC boost chopper circuit includes a boost inductor L1, a freewheeling diode D1, an output capacitor C1, a MOS switch tube Q1, a first resistor R1, a second resistor R2, a third resistor R3, and a boost control DAC, a digital-to-analog converter DAC;

[0031] One end of the source and drain of the MOS switch Q1 is grounded, and the other end is connected to the positive end of the freewheeling diode D1 and one end of the boost inductor L1;

[0032] The gate of the MOS switch Q1 is connected to the output terminal of the gate drive signal GLS_T of the boost controller;

[0033] The other end of the boost inductor L1 is connected to an external power supply VBAT;

[0034] The negative terminal of the freewheeling diode D1 serves as the output terminal of the boosted voltage VOUT of the DC boost chopper circuit;

[0035] The output capacitor C1 is connected between the negative terminal of the freewheeling diode D1 and the ground;

[0036] The first resistor R...

Example Embodiment

[0042] Example two

[0043] Based on the first embodiment, the DC boost chopper circuit further includes a fourth resistor R4;

[0044] One end of the source and drain of the MOS switch Q1 is grounded through a fourth resistor R4;

[0045] The fourth resistor R4 has two ends connected to the two current sampling input terminals RSP_T and RSN_T of the boost controller, and is used for sampling the source and drain current of the MOS switch Q1;

[0046] The boost controller controls the output of the gate drive signal GLS_T according to the output of the comparator AMP and the source leakage current sampling of the MOS switch Q1, thereby stabilizing the boost voltage output by the negative terminal of the freewheeling diode D1 VOUT.

Example Embodiment

[0047] Example three

[0048] Based on the second embodiment, the MOS switch Q1 is an N-channel MOSFET (Metal-Oxide-SemiconductorField-Effect Transistor, metal-oxide-semiconductor-field effect transistor);

[0049] The source of the MOS switch Q1 is grounded through a fourth resistor, the drain is connected to the positive end of the freewheeling diode D1 and one end of the boost inductor L1, and the gate is connected to the gate drive signal GLS_T of the boost controller. The output terminal.

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Abstract

The invention discloses a DC voltage-boosting chopper circuit comprising a voltage-boosting inductor, a freewheeling diode, an output capacitor, an MOS switch tube, a first resistor, a second resistor, a third resistor, a voltage-boosting controller and a digital-to-analog converter. The grid electrode of the MOS switch tube is connected with the grid electrode driving signal output end of the voltage-boosting controller. The first resistor and the second resistor are connected in series between the negative end of the freewheeling diode and ground. The digital-to-analog converter is used for outputting corresponding analog voltage according to the inputted digital signal. The third resistor is connected between the analog voltage output end of the digital-to-analog converter and a connecting point of the first resistor and the second resistor. The voltage-boosting controller comprises a comparator. One input end of the comparator is connected with reference voltage, and the other input end is connected with the connecting point of the first resistor and the second resistor. The voltage-boosting controller controls output of a grid electrode driving signal according to output of the comparator. According to the DC voltage-boosting chopper circuit, range of output voltage can be continuously adjusted via software.

Description

technical field [0001] The invention relates to a power supply circuit, in particular to a DC step-up chopper circuit. Background technique [0002] DC boost chopper circuit (the boost converter), the output voltage is higher than the input voltage. Its basic circuit is as figure 1 shown. [0003] When Q1 is in the off state, the power supply VBAT supplies power to the load through the inductor L1 and the diode D1. At this time, the drain voltage of Q1 is VBAT (neglecting the impedance of the inductor and the conduction voltage drop of the diode). When Q1 is turned on, at this time Q1 The drain voltage of VBAT changes from VBAT to 0, a voltage drop occurs across the inductor, the inductor current begins to increase, and the inductor begins to store energy; at this time, the diode D1 is in an off state, and the output terminal provides energy to the load from the capacitor C1, and the capacitor releases energy, Q1 When it is turned off, the switching state of the circuit c...

Claims

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Application Information

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IPC IPC(8): H02M3/156
Inventor 高立颍岳少鹏金立博孙琦韩本忠
Owner LIANCHUANG AUTOMOBILE ELECTRONICS
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