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Multiplex output circuit and control method thereof

A multi-channel output and output voltage technology, which is applied in the direction of control/regulation system, adjustment of electric variables, instruments, etc., can solve problems such as low pressure difference and limit start-up pressure difference

Inactive Publication Date: 2008-06-04
ASTEC POWER SUPPLY (SHENZHEN) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a multi-channel output voltage start-up pressure difference tracking circuit and a control method for the multi-channel output circuit to solve the problem of limiting the start-up pressure difference when starting the machine and meet the requirements of low pressure difference

Method used

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  • Multiplex output circuit and control method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Such as figure 2 As shown, a multi-channel output circuit, except for the one with the lowest output voltage, each other output circuit includes a voltage outer loop control circuit a, a voltage detection circuit d, a reference circuit c and a main circuit z, the reference circuit c The output terminal of the voltage detection circuit d is coupled to the reference terminal of the voltage outer loop control circuit a, and the voltage detection circuit d includes a first resistor R1 and a second resistor R2 connected in series, and the series branch is connected to the first resistor R2 of the main circuit z. Between the output terminal +VOUT1 and the second output terminal -VOUT1, the second output terminal -VOUT1 is connected to the ground GNDS, wherein the connection point of the first resistor R1 and the second resistor R2 is the voltage detection circuit d A sampling terminal, the sampling terminal is connected to the sampling terminal of the voltage outer loop contro...

Embodiment 2

[0076] As shown in FIG. 3C , the only difference between this circuit and Embodiment 1 is that in the start-up differential pressure circuit b, the sixth resistor R6 and the first MOS transistor Q1 are replaced by NPN transistor K1 . Because the transistor itself has a voltage drop, the sixth resistor R6 can be removed, and the NPN transistor K1 can realize the voltage dividing function realized by the sixth resistor R6 and the first MOS transistor Q1.

[0077] The output end of the reference circuit c is connected to the ground GNDS through the fifth resistor R5, the collector and the emitter of the NPN transistor K1 in turn; the base of the NPN transistor K1 is connected to the connection between the ninth resistor R9 and the third capacitor C3 Point.

[0078] The start-up differential voltage circuit b also includes a second capacitor C2, which is connected across the collector and emitter of the NPN transistor K1.

Embodiment 3

[0080] Such as Figure 5 As shown, a multi-channel output circuit, except for the one with the lowest output voltage, each other output circuit includes a voltage outer loop control circuit a, a voltage detection circuit d, a reference circuit c and a main circuit z, the reference circuit c The output terminal of the voltage detection circuit d is connected to the reference terminal of the voltage outer loop control circuit a, and the voltage detection circuit d includes a first resistor R1 and a second resistor R2 connected in series, and the series branch is connected to the first resistor of the main circuit z. Between the output terminal +VOUT1 and the second output terminal -VOUT1, the second output terminal -VOUT1 is connected to the ground GNDS, wherein the connection point of the first resistor R1 and the second resistor R2 is the voltage detection circuit d A sampling terminal, the sampling terminal is coupled to the sampling terminal of the voltage outer loop control...

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PUM

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Abstract

The invention discloses a kind of multi-channel output circuit and its controlling method, relating to electrical source area. The circuit includes the machine-starting voltage difference circuit, connected between the benchmark end of the voltage outer cycle controlling circuit and the output end of the benchmark circuit. The said machine-starting voltage difference circuit obtains a benchmark value from the output end of the said benchmark circuit, and correspondingly outputs a new benchmark value to the benchmark end of the voltage outer cycle controlling circuit; the sampling end of the said benchmark end of the voltage outer cycle controlling circuit obtains a sampling value from the sampling end of the said voltage monitoring circuit, and compares the sampling value with the said new sampling value, output a controlling value through its output end to the controlling end of the said main circuit, to control the output voltages of the first and the second output end of the controlling main circuit; the controlling method includes: make the machine starting voltage of the channel with lowest output voltage as the starting reference voltage of other channels; the output of other channels rises in two stages, and the final voltage is also the output rated voltage. The invention can meet the demand of low voltage difference.

Description

[technical field] [0001] The invention relates to the technical field of power supplies, in particular to a multi-channel output circuit and a control method thereof. [Background technique] [0002] Most of today's very large scale integration (VLSI) logic devices including digital signal processing (DSP), field programmable gate array (FPGA), and microprocessors require at least two supply voltages, both between their I / O and There is a maximum voltage difference specified between the core power supplies, and once the voltage difference between the I / O and core power supplies exceeds this maximum voltage difference, the integrated circuit (IC) will be damaged. In order to prevent the integrated circuit (IC) from being damaged, the start-up voltage drop of multi-channel (including dual-channel) output voltage should be as small as possible. [0003] At present, there are two main forms of the existing multi-channel output voltage start-up voltage difference tracking circuit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/46
Inventor 秦梅张学易强
Owner ASTEC POWER SUPPLY (SHENZHEN) CO LTD