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High-voltage bootstrap sampling circuit

A technology for sampling capacitors and circuits, which is used in circuits, electronic switches, electrical components, etc.

Pending Publication Date: 2019-04-16
MICROCHIP TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, power circuits typically generate higher voltages, and measuring current on the high side introduces high common-mode voltages
Therefore, using such measurement circuits to determine current in high voltage circuits may require special sampling circuits

Method used

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Examples

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Embodiment Construction

[0020] According to various implementations, a classic bootstrap sampling switch can be used with a high linearity analog-to-digital converter (ADC) that uses a sample-and-hold circuit to force a metal-oxide-semiconductor field-effect transistor (MOSFET) to sample A fixed Vgs (voltage between gate and source) of the switch. Traditionally, circuits like the one disclosed herein (hereinafter "the circuit") can be used at lower voltages due to their high linearity (because Vgs is constant and independent of the input voltage). In this modified circuit, according to various embodiments, a number of important changes are incorporated as follows: (1) The sampling voltage can be substantially higher than the supply voltage. Other existing circuits can be found in the literature, but the voltage difference must be relatively small. A common mode (CM) input of 40 VDC or higher, such as 70 VDC, may be sampled using a 2.7 volt direct current (VDC) power supply or less in accordance with...

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Abstract

The invention provides a bootstrapped sampling switch that may be used at lower supply voltages due to its high linearity, wherein the sampled voltage may be substantially higher than the supply voltage. A 2.7 volt or lower DC supply may be used with the sampling switch to sample a much higher voltage. A plurality of these high voltage transmission gate switches may be connected directly together,thereby removing a primary source of channel-to-channel mismatch (the active buffer / voltage reduction circuit) and enables new methods of error compensation not previously possible. The sampling switch circuit does not consume DC current from what is being measured. There may be a small switched capacitor voltage charge and there may be some voltage leakage, but no DC current is drawn from the voltage input being measured.

Description

[0001] Related Patent Applications [0002] This application claims priority to commonly-owned US Provisional Patent Application No. 62 / 406,881, filed October 11, 2016; which Provisional Patent Application is hereby incorporated by reference herein for all purposes. technical field [0003] The present disclosure relates to sampling circuits, and in particular, to sampling circuits for higher voltage circuits. Background technique [0004] To measure voltage and current, for example, in a power supply circuit, a shunt resistor is coupled to a measurement device, such as a sense (measurement) resistor and a sense amplifier coupled to the sense resistor. The higher voltage node of the sense resistor may be referred to as "VBUS," and the voltage node on the load side of the sense resistor may be referred to as "VSENSE." The sense amplifier may also include a sampling circuit in the analog front-end circuit. Such a device may be combined with a microcontroller with an analog-...

Claims

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Application Information

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IPC IPC(8): H03K17/06H03K17/687
CPCH03K17/063H03K17/6872H03K2217/0054H03K17/168G11C27/026H03K17/08
Inventor 丹·米查姆
Owner MICROCHIP TECH INC
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