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A Method of Constant Switching Frequency Discontinuous Current Mode Average Output Current Control

A constant switching frequency, discontinuous current technology, applied in the direction of converting DC power input to DC power output, output power conversion device, control/regulation system, etc. achieve simple effect

Active Publication Date: 2015-09-16
邳州市景鹏创业投资有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method makes the average output current accuracy of the power current converter depend on the input and output voltage of the power current converter, the accuracy of circuit devices and the accuracy of switching frequency

Method used

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  • A Method of Constant Switching Frequency Discontinuous Current Mode Average Output Current Control
  • A Method of Constant Switching Frequency Discontinuous Current Mode Average Output Current Control
  • A Method of Constant Switching Frequency Discontinuous Current Mode Average Output Current Control

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Embodiment 1, as figure 1 As shown, a method of constant switching frequency discontinuous current mode average output current control is given: including reference source block 1, reference source operation function block 2, state detection block 3, error detection block 4, zero-crossing detection block 5, Power driver block 6 and internal clock; the above-mentioned reference source block 1, reference source computing function block 2, error detection block 4 and power driver block 6 are connected sequentially, and the reference source computing function block 2 is connected with a zero-crossing detection block 5 (in practice, the zero-crossing detection block 5 is also connected to the power current converter), the error detection block 4 is connected to the state detection block 3, and the power driver block 6 is connected to the internal clock.

[0023] The above-mentioned reference source block 1 generates a predetermined control signal; the above-mentioned referen...

Embodiment 2

[0041] Embodiment 2, image 3 It is a specific schematic diagram of the present invention for a buck-boost power-current converter: there are several functional blocks, which are respectively predetermined control signals V REF (i.e. reference source block 1), reference source operation block 11 (i.e. reference source operation block 2), detection resistor 15 (i.e. state detection block 3), comparator 12 (i.e. error detection block 4), state zero-crossing detection device 13 (that is, the zero-crossing detection block 5 ), the power driver 14 of the power switch (that is, the power driver block 6 ) and an internal clock 16 . Its working principle and connection method are the same as figure 2 The same as described for the flyback power current converter.

Embodiment 3

[0042] Embodiment 3, Figure 4 is a block diagram of a boost power current converter. There are a number of functional blocks, respectively for the predetermined control signal V REF (i.e. reference source block 1), reference source operation block 11 (i.e. reference source operation block 2), detection resistor 15 (i.e. state detection block 3), comparator 12 (i.e. error detection block 4), state zero-crossing detection device 13 (that is, the zero-crossing detection block 5 ), the power driver 14 of the power switch (that is, the power driver block 6 ) and an internal clock 16 . Its working principle and connection method are the same as figure 2 The same as described for the flyback power current converter.

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Abstract

The invention discloses a method for controlling average output current at constant switching frequency in an interrupted current mode. A reference source block, a reference source operation function block, an error detection block and a power driver block are connected in order; the reference source operation function block is connected with a zero-cross detection block; the error detection block is connected with a state detection block; the power driver block is connected with an internal clock; a predetermined control signal is generated by the reference source block; a reference control signal is generated by the reference source operation function block; the state variable of the power current converter is detected by the state detection block and is transformed; the error detection block is used for detecting the D-value of the signals outputted from the state detection block and the reference source operation function block, and controlling the power driver block; the zero-cross detection block is used for the state variable detection of the current convertor, and feeding back the signal to the reference source operation function block; the power driver block is used for driving the power switch; and the power driver block is controlled by the internal clock.

Description

technical field [0001] The present invention relates to power current converter topology and control; more specifically, the present invention relates to a high-precision control scheme for controlling the average output current of a power current converter, that is, a constant switching frequency discontinuous current mode average method of output current control. Background technique [0002] In the existing power current converter control methods, when the inductor current of the power current converter operates in discontinuous mode, there is a constant power control method, that is, if the peak current of the inductor can be controlled, the output power can be controlled. This method is used to generate a series of pulse width modulated pulse control signals of the power current converter and to control the power switches of the power current converter. This method enables the average output current of the power current converter to follow a predetermined control sign...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H02M3/156H02M1/08
Inventor 魏其萃翁大丰
Owner 邳州市景鹏创业投资有限公司
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