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A voltage feedback processing circuit

A technology for processing circuits and voltages, applied in the field of voltage backfill processing circuits, can solve the problems of series resistance affecting timing, high cost, and the system cannot operate normally, and achieves the effects of normal and reliable long-term operation, low cost and complexity

Active Publication Date: 2019-05-07
GUANGDONG VTRON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Option 1 can only reduce the voltage value of backfeed voltage. For the interconnection of some high-speed signals, the series resistance will affect the timing and cause the system to fail to operate normally.
[0008] Method 2 will also affect the timing of the signal for high-speed signals. In addition, when there are many interconnected signals, the cost is relatively high

Method used

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  • A voltage feedback processing circuit
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Examples

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Embodiment 1

[0029] Such as Figure 4 As shown, it is a structure diagram of a specific embodiment of a voltage backfeed processing circuit according to the present invention. See Ann figure 1 In this specific embodiment, a voltage feedback processing circuit specifically includes a switch circuit 110, a controlled load circuit 120, and a switch control circuit 130; the input end of the switch circuit 110 and the input end of the controlled load circuit 120 are provided by an input power chip Power The voltage V_SOURCE; the output end of the switch circuit 110 is used to connect with the integrated circuit IC, and is used to provide the normal operating voltage V-CPU under the non-standby state for the integrated circuit IC, and the output end of the switch circuit 110 is also connected with the switch control circuit 130 The input end is connected; the output end of the controlled load circuit 120 is used for connecting with the integrated circuit IC, and the output end of the switch con...

Embodiment 2

[0032] On the basis of Embodiment 1, this specific embodiment provides a specific implementation circuit of the voltage backfeed processing circuit. Such as Figure 5 Shown is the specific circuit of this specific embodiment. see Figure 5 In a voltage backfeed processing circuit in this specific embodiment, the switch control circuit 130 includes a diode D1, a fifth resistor R5, a sixth resistor R6, a fourth capacitor C4, a third transistor Q3, a third resistor R3, and a diode The anode of D1 is connected to the output terminal of the switch circuit, the cathode of diode D1 is connected to one end of R5 and one end of C4, the cathode of diode D1 is also connected to one end of R6, the other end of R6 is connected to DGND ground, and the other end of R5 and C4 is connected It is connected to the base of Q3, the emitter of Q3 is connected to DGND ground, the collector of Q3 is connected to one end of R3, and the other end of R3 is connected to the control end of the switch ci...

Embodiment 3

[0039] Different from Embodiment 2, this specific embodiment adopts such as Figure 6 The switch control circuit shown realizes the voltage feedback processing circuit of this patent. In this specific embodiment, a comparator is used to implement the switch control circuit 130 . Compared with Embodiment 2, the cost is slightly higher, but the restriction on the backfeed voltage value is released.

[0040] see Figure 6 , the switch control circuit 130 in this specific embodiment includes an eleventh resistor R11, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a tenth capacitor C10, a comparator U1, and a twelfth resistor R12 , the ninth capacitor C9, the first mos tube mos1, the ninth resistor R9, the voltage at one end of R11 comes from the voltage V-StandBy of the power chip working normally in standby mode, the other end of R11 and one end of R15, and the negative pin of the comparator Connect and connect to the DGND ground through C10, th...

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PUM

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Abstract

The invention relates to the field of voltage processing, and more specifically, to a voltage backfeed processing circuit. It includes a switch circuit, a controlled load circuit and a switch control circuit. The input terminal of the switch circuit and the input terminal of the controlled load circuit adopt the voltage provided by the input power chip; the output terminal of the switch circuit is used to connect with the integrated circuit IC, and the switch circuit The output end of the switch control circuit is also connected to the input end of the switch control circuit; the output end of the controlled load circuit is used to connect with the integrated circuit IC, and the output end of the switch control circuit is connected to the control end of the switch circuit to control the on-off of the switch circuit . The invention can control the range of the reverse feeding voltage after the output end of the switch circuit, and limit the reverse feeding voltage within a certain range without affecting the timing of the IC circuit. At the same time, other circuits in the board are not affected by the circuit of the present invention, and the cost of the whole solution is controllable.

Description

technical field [0001] The invention relates to the field of voltage processing, and more specifically, to a voltage backfeed processing circuit. Background technique [0002] At present, most integrated circuit ICs have integrated protection diodes inside the IO to prevent the IO pins from being damaged by ESD or transient high voltage. The internal schematic diagram is as follows figure 1 shown. [0003] However, there is a problem with this solution, that is, when the IC power supply is not powered on and the IO pins are powered, there will be a back-feeding voltage on the power rail of the IC. This phenomenon will exist in large numbers when the system has two parts of the standby and non-standby power supplies. When the output pin of the IC in the standby state is at a high level during standby, the high level will pass through the diode of the IO pin of the connected IC in the unpowered state, and the current is in the unpowered state. The voltage generated on the gr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/04
CPCH02H9/04
Inventor 朱彦
Owner GUANGDONG VTRON TECH CO LTD