From ca062b8b753cdc6ee30ffbe4a2d8e0d01e140834 Mon Sep 17 00:00:00 2001 From: Thomas Dehaeze Date: Tue, 8 Sep 2020 16:00:29 +0200 Subject: [PATCH] Update Content - 2020-09-08 --- content/zettels/current_amplifier.md | 20 ++++++++++++++++++++ content/zettels/voltage_amplifier.md | 27 ++++++++++++++++++--------- 2 files changed, 38 insertions(+), 9 deletions(-) create mode 100644 content/zettels/current_amplifier.md diff --git a/content/zettels/current_amplifier.md b/content/zettels/current_amplifier.md new file mode 100644 index 0000000..3405318 --- /dev/null +++ b/content/zettels/current_amplifier.md @@ -0,0 +1,20 @@ ++++ +title = "Current Amplifier" +author = ["Thomas Dehaeze"] +draft = false ++++ + +Tags +: [Electronics]({{< relref "electronics" >}}), [Voice Coil Actuators]({{< relref "voice_coil_actuators" >}}) + + +## Current Amplifier to drive Inductive Loads {#current-amplifier-to-drive-inductive-loads} + + +### Manufacturers {#manufacturers} + +| Manufacturers | Links | Country | +|---------------|-------|---------| +| | | | + +<./biblio/references.bib> diff --git a/content/zettels/voltage_amplifier.md b/content/zettels/voltage_amplifier.md index d262983..4671f4d 100644 --- a/content/zettels/voltage_amplifier.md +++ b/content/zettels/voltage_amplifier.md @@ -12,7 +12,7 @@ Tags : [Signal to Noise Ratio]({{< relref "signal_to_noise_ratio" >}}), [Piezoelectric Actuators]({{< relref "piezoelectric_actuators" >}}), [Electronics]({{< relref "electronics" >}}) -## Voltage Amplifiers to drive Capacitive Load {#voltage-amplifiers-to-drive-capacitive-load} +## Voltage Amplifiers to drive Capacitive Loads {#voltage-amplifiers-to-drive-capacitive-loads} ### Manufacturers {#manufacturers} @@ -20,11 +20,11 @@ Tags | Manufacturers | Links | Country | |---------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------|-------------| | Piezo Drive | [link](https://www.piezodrive.com/drivers/) | Australia | -| Thorlabs | [link](https://www.thorlabs.com/navigation.cfm?guide%5FID=2085) | USA | +| Falco System | [link](https://www.falco-systems.com/products.html) | Netherlands | | PI | [link](https://www.pi-usa.us/en/products/controllers-drivers-motion-control-software/piezo-drivers-controllers-power-supplies-high-voltage-amplifiers/) | USA | +| Thorlabs | [link](https://www.thorlabs.com/navigation.cfm?guide%5FID=2085) | USA | | Micromega Dynamics | | Belgium | | Lab Systems | [link](https://www.lab-systems.com/products/amplifier/amplifier.html) | Isreal | -| Falco System | [link](https://www.falco-systems.com/products.html) | Netherlands | | Piezomechanics | [link](https://www.piezomechanik.com/products/) | Germany | | Cedrat Technologies | [link](https://www.cedrat-technologies.com/en/products/piezo-controllers/electronic-amplifier-boards.html) | France | | Trek | [link](https://www.trekinc.com/products/HV%5FAmp.asp) | USA | @@ -38,9 +38,9 @@ Tags The piezoelectric stack can be represented as a capacitance. -Let's take a capacitance driven by a voltage amplifier (Figure [1](#orgf2b344c)). +Let's take a capacitance driven by a voltage amplifier (Figure [1](#org4297943)). - + {{< figure src="/ox-hugo/voltage_amplifier_capacitance.png" caption="Figure 1: Piezoelectric actuator model with a voltage source" >}} @@ -60,7 +60,7 @@ Thus, for a specified maximum current \\(I\_\text{max}\\), the "power bandwidth" - Above \\(\omega\_{0, \text{max}}\\), the maximum current \\(I\_\text{max}\\) is reached and the maximum voltage that can be applied decreases with frequency: \\[ U\_\text{max} = \frac{I\_\text{max}}{\omega C} \\] -The maximum voltage as a function of frequency is shown in Figure [2](#org1190638). +The maximum voltage as a function of frequency is shown in Figure [2](#orgb578cd2). ```matlab Vpkp = 170; % [V] @@ -74,7 +74,7 @@ C = 1e-6; % [F] 56.172 ``` - + {{< figure src="/ox-hugo/voltage_amplifier_max_V_piezo.png" caption="Figure 2: Maximum voltage as a function of the frequency for \\(C = 1 \mu F\\), \\(I\_\text{max} = 30mA\\) and \\(V\_{pkp} = 170 V\\)" >}} @@ -88,7 +88,7 @@ If driven at \\(\Delta U = 100V\\), \\(C = 1 \mu F\\) and \\(I\_\text{max} = 1 A ### Bandwidth limitation (small signals) {#bandwidth-limitation--small-signals} -This is takken from Chapter 14 of ([Fleming and Leang 2014](#org2e80fee)). +This is takken from Chapter 14 of ([Fleming and Leang 2014](#orgd3659c0)). ```matlab L = 250e-9; % Cable inductance [H] @@ -112,6 +112,15 @@ Specifications are usually: The bandwidth can be estimated from the Maximum Current and the Capacitance of the Piezoelectric Actuator. +### Problem to drive highly capacitive loads {#problem-to-drive-highly-capacitive-loads} + +At high frequency, the impedance of the capacitive load is very small. +This can pose several problems: + +- the current to be supplied by the amplifier to have some voltage becomes very large +- the internal impedance of the amplifier may be large compared to the load impedance, and thus large voltage drop will occur + + ## Bibliography {#bibliography} -Fleming, Andrew J., and Kam K. Leang. 2014. _Design, Modeling and Control of Nanopositioning Systems_. Advances in Industrial Control. Springer International Publishing. . +Fleming, Andrew J., and Kam K. Leang. 2014. _Design, Modeling and Control of Nanopositioning Systems_. Advances in Industrial Control. Springer International Publishing. .