公开(公告)号：US20180106925A1

公开(公告)日：2018-04-19

申请号：US15820482

申请日：2017-11-22

申请人： Bruce Halcro Candy

发明人： Bruce Halcro Candy

IPC分类号： G01V3/10

CPC分类号： G01V3/104

摘要： A metal detector transmitting, through a transmit coil, a repeating transmit signal cycle, which includes at least one receive period and at least one non zero transmit coil reactive voltage period; and sensing a current in the transmit coil during at least one receive period to control a magnitude and/or duration of the at least one non zero transmit coil reactive voltage period such that the average value of the current during at least one receive period of every repeating transmit signal cycle is substantially constant from cycle to cycle, and the current during at least one receive period is substantially independent of the inductance of the transmit coil.

公开(公告)号：US20120212227A1

公开(公告)日：2012-08-23

申请号：US13388137

申请日：2010-07-28

申请人： Bruce Halcro Candy

发明人： Bruce Halcro Candy

IPC分类号： G01V3/08 ,  G01R23/16

CPC分类号： G01V3/15 ,  G01V3/104

摘要： This invention relates to receive electronics of a metal detector for processing a received signal from a target in a soil, the receive electronics including: processing electronics for synchronous demodulating or sampling the received signal to produce at least two substantially ground balanced signals; processing electronics for processing the at least two substantially ground balanced signals to produce at least two substantially ground balanced processed signals, a first substantially ground balanced processed signal being more indicative of a spread of a time constant density spectrum of the received signal than a second substantially ground balanced processed signal, and the second substantially ground balanced processed signal being more indicative of an average time constant of the received signal than the first substantially ground balanced processed signal; and processing electronics for processing the at least two substantially ground balanced processed signals to produce an output signal indicative of at least the spread of the time constant density spectrum.

摘要翻译： 本发明涉及一种用于处理来自土壤中的目标的接收信号的金属检测器的接收电子器件，所述接收电子装置包括：处理电子装置，用于同步解调或采样所接收的信号以产生至少两个基本平衡的信号; 处理电子设备，用于处理所述至少两个基本接地的平衡信号以产生至少两个基本上平衡的经处理的信号;第一基本接地平衡处理的信号更多地指示接收信号的时间常数密度谱的扩展， 接地平衡处理信号，并且第二基本接地平衡处理信号更多地表示接收信号的平均时间常数，而不是第一基本接地平衡处理信号; 以及处理电子设备，用于处理所述至少两个基本上平衡的经处理的信号，以产生至少指示时间常数密度谱扩展的输出信号。

公开(公告)号：US07301393B2

公开(公告)日：2007-11-27

申请号：US10545151

申请日：2004-02-11

申请人： Bruce Halcro Candy

发明人： Bruce Halcro Candy

IPC分类号： H03F3/38

CPC分类号： H03F1/32 ,  H03F1/34 ,  H03F3/217 ,  H03F2200/03 ,  H03F2200/351 ,  H03K4/06 ,  H03K7/08

摘要： An electronic class-D amplifier with intrinsically low distortion employing modulation of the slopes of a triangular-wave carrier reference signal; the modulation being in proportion to the derivative of the input signal. The negation of the distortion is most successful if this derivative signal is shifted in phase and gain to compensate for the closed loop phase and gain of the amplifier. The amplifier includes a pulse width modulator which includes an oscillator (5) with at least one integrator and a first comparator (6), at least one servo-loop amplifier (3), an input signal processor (4) which processes and modifies the input amplifier signal. An output signal of the oscillator produces a carrier reference signal (13) which includes at least positive and negati derivative components, which are modulated by an output of the input signal processor (4) which is applied to a modulation input of the oscillator (5), whereby at least the symmetry of the carrier reference signal is modulated. An output (11) of the output switching stage is fed back via a negative feedback path (15) to an input of the servo-loop amplifier (3).

摘要翻译： 一种具有三角波载波参考信号斜率调制的本质上低失真的电子D类放大器; 调制与输入信号的导数成比例。 如果该导数信号在相位和增益上移位以补偿放大器的闭环相位和增益，则失真的否定是最成功的。 该放大器包括一个脉冲宽度调制器，它包括具有至少一个积分器和第一比较器（6）的振荡器（5），至少一个伺服环路放大器（3），一个输入信号处理器（4） 输入放大器信号。 振荡器的输出信号产生载波参考信号（13），载波参考信号（13）包括至少正和负导数分量，其被输入信号处理器（4）的输出调制，输入信号处理器（4）的输出被施加到振荡器（5）的调制输入端 ），由此至少调制载波参考信号的对称性。 输出开关级的输出（11）通过负反馈路径（15）反馈到伺服环路放大器（3）的输入端。

公开(公告)号：US07924012B2

公开(公告)日：2011-04-12

申请号：US12373046

申请日：2007-07-12

申请人： Bruce Halcro Candy

发明人： Bruce Halcro Candy

IPC分类号： G01V3/10

CPC分类号： G01V3/107

摘要： An electronic metal detector having, a transmit coil arranged and adapted to transmit an alternating magnetic field associated with a reactive transmit coil voltage, the transmit coil being connected to transmit electronics arranged and adapted to generate a transmit signal, the transmit electronics having at least two power sources, a first power source and a second power source, wherein the first power source is adapted and arranged to connect to the transmit coil for at least a first period, and the second power source is adapted and arranged to connect to tie transmit coil for at least a second period, the said transmit electronics including at least one servo control negative feedback loop, a first servo control negative feedback loop, which is adapted and arranged to monitor a transmit coil current for at least part of the said first period, and to control at least part of the said transmit signal, the transmit electronics being adapted and arranged to control the transmit signal to produce the reactive transmit coil voltage to be approximately constant and approximately equal to zero while the transmit coil current is non-zero and approximately constant for at least part of the first period; and receive electronics which are adapted and arranged to receive and process a receive magnetic field during at least some of the first period to produce an indicator output.

摘要翻译： 一种电子金属检测器，具有布置并适于传输与无功发射线圈电压相关联的交变磁场的发射线圈，所述发射线圈连接到布置并适于产生发射信号的发射电子器件，所述发射电子器件具有至少两个 电源，第一电源和第二电源，其中所述第一电源适于并布置成连接到所述发射线圈至少第一周期，并且所述第二电源适于并布置成连接到发射线圈 在至少第二周期中，所述发射电子装置包括至少一个伺服控制负反馈回路，第一伺服控制负反馈回路，其被适配和布置为在至少部分所述第一周期内监测发射线圈电流， 并且为了控制所述发射信号的至少一部分，所述发射电子装置被适配和布置成控制所述发射信号 以产生无功发射线圈电压近似恒定且近似等于零，而发射线圈电流在第一周期的至少一部分为非零且近似恒定; 以及接收电子设备，其被适配和布置成在所述第一周期的至少一些期间内接收和处理接收磁场以产生指示符输出。

公开(公告)号：US07791345B2

公开(公告)日：2010-09-07

申请号：US12621338

申请日：2009-11-18

申请人： Bruce Halcro Candy

发明人： Bruce Halcro Candy

IPC分类号： G01V3/10

CPC分类号： G01V3/104

摘要： A metal detector including transmit electronics having a plurality of switches for generating a repeating transmit signal cycle for transmission by a transmit coil. The repeating transmit signal cycle includes at least a high voltage period, and at least a low voltage period, the low voltage period followed by a substantially zero voltage period. The output impedance of the transmit electronics is less than three times the equivalent series resistance of the transmit coil during the low voltage period and the substantially zero voltage period.

摘要翻译： 一种金属检测器，包括具有多个开关的发射电子器件，用于产生用于由发射线圈传输的重复发射信号周期。 重复的发射信号周期包括至少一个高电压周期和至少一个低电压周期，该低电压周期后面是一个基本为零的电压周期。 发射电子器件的输出阻抗小于发射线圈在低电压周期和基本零电压周期期间的等效串联电阻的三倍。

公开(公告)号：US20100019769A1

公开(公告)日：2010-01-28

申请号：US12373046

申请日：2007-07-12

申请人： Bruce Halcro Candy

发明人： Bruce Halcro Candy

IPC分类号： G01V3/10

CPC分类号： G01V3/107

摘要： An electronic metal detector having, a transmit coil arranged and adapted to transmit an alternating magnetic field associated with a reactive transmit coil voltage, the transmit coil being connected to transmit electronics arranged and adapted to generate a transmit signal, the transmit electronics having at least two power sources, a first power source and a second power source, wherein the first power source is adapted and arranged to connect to the transmit coil for at least a first period, and the second power source is adapted and arranged to connect to tie transmit coil for at least a second period, the said transmit electronics including at least one servo control negative feedback loop, a first servo control negative feedback loop, which is adapted and arranged to monitor a transmit coil current for at least part of the said first period, and to control at least part of the said transmit signal, the transmit electronics being adapted and arranged to control the transmit signal to produce the reactive transmit coil voltage to be approximately constant and approximately equal to zero whilst the transmit coil current is non-zero and approximately constant for at least part of the first period; and receive electronics which are adapted and arranged to receive and process a receive magnetic field during at least some of the first period to produce an indicator output.

摘要翻译： 一种电子金属检测器，具有布置并适于传输与无功发射线圈电压相关联的交变磁场的发射线圈，所述发射线圈连接到布置并适于产生发射信号的发射电子器件，所述发射电子器件具有至少两个 电源，第一电源和第二电源，其中所述第一电源适于并布置成连接到所述发射线圈至少第一周期，并且所述第二电源适于并布置成连接到发射线圈 在至少第二周期中，所述发射电子装置包括至少一个伺服控制负反馈回路，第一伺服控制负反馈回路，其被适配和布置为在至少部分所述第一周期内监测发射线圈电流， 并且为了控制所述发射信号的至少一部分，所述发射电子装置被适配和布置成控制所述发射信号 以使无功发射线圈电压近似恒定并且近似等于零，而发射线圈电流在第一周期的至少一部分处于非零且近似恒定; 以及接收电子设备，其被适配和布置成在所述第一周期的至少一些期间内接收和处理接收磁场以产生指示符输出。

公开(公告)号：US20080122534A1

公开(公告)日：2008-05-29

申请号：US11666985

申请日：2005-11-02

申请人： Bruce Halcro Candy

发明人： Bruce Halcro Candy

IPC分类号： H03F3/217

CPC分类号： H03F3/217 ,  H03F1/32

摘要： A class-D audio amplifier switching output stage with reduced distortion including, application of damping to the power supply voltage nodes in the form for example of a low inductance damping snubber circuit including a first resistor in series with a second capacitor connected via a low inductance path between the power supplies connecting the output switching devices.

摘要翻译： 具有减小失真的D类音频放大器切换输出级，包括以例如低电感阻尼缓冲电路的形式向电源电压节点施加阻尼，其包括与通过低电感连接的第二电容器串联的第一电阻器 连接输出交换设备的电源之间的路径。

公开(公告)号：US07227408B2

公开(公告)日：2007-06-05

申请号：US11138896

申请日：2005-05-26

申请人： Bruce Halcro Candy

发明人： Bruce Halcro Candy

IPC分类号： H03F3/38

CPC分类号： H03F3/217 ,  H03F1/34 ,  H03F3/45475

摘要： An electronic class-D amplifier including a pulse width modulator and a servo-loop amplifier characterized in that there is provided a sample and hold element which samples a signal at the sample input when a sample command signal is applied to a control input, and holds the value of the last sampled value of the signal at the sample input when a hold command signal is applied to the control input, and the output of the sample and hold element is connected to a modulation input of the pulse width modulator wherein a negative feedback path connects an output of the output switching stage to an input of the servo-loop amplifier.

摘要翻译： 一种包括脉冲宽度调制器和伺服环路放大器的电子D类放大器，其特征在于提供了一个采样和保持元件，当采样指令信号被施加到控制输入时，采样和保持元件对采样输入端的信号进行采样，并保持 当保持命令信号被施加到控制输入时采样输入处的信号的最后采样值的值，并且采样和保持元件的输出连接到脉冲宽度调制器的调制输入端，其中负反馈 路径将输出开关级的输出连接到伺服环路放大器的输入端。

公开(公告)号：US06600367B2

公开(公告)日：2003-07-29

申请号：US09915190

申请日：2001-07-24

申请人： Bruce Halcro Candy

发明人： Bruce Halcro Candy

IPC分类号： H06F352

CPC分类号： H03F3/3018 ,  H03F3/42 ,  H03F3/4517 ,  H03F2203/30078 ,  H03F2203/30111 ,  H03F2203/45566

摘要： An electronic amplifier providing very low distortion which includes an output stage with an output error correction stage containing two amplifiers and wherein there are at least four local negative feedback paths, an output of the first amplifier being connected to an input of output stage transistor buffers or output stage transistors through a first network, an output of the second amplifier being connected to an input of output stage transistor buffers or output stage transistors through a second network, where components of the first and second amplifier the local negative feedback paths, first and second networks and output stage transistor buffers are selected to form substantially second order local dominant pole. Also disclosed is the supply of power to said first and second amplifiers from a floating power supply means coupled to either an or the output of the output stage so that the voltage of the floating power supply will follow substantially an output voltage of the output stage.

公开(公告)号：US09348053B2

公开(公告)日：2016-05-24

申请号：US13326179

申请日：2011-12-14

申请人： Bruce Halcro Candy

发明人： Bruce Halcro Candy

IPC分类号： G01V3/10

CPC分类号： G01V3/104 ,  G01V3/105

摘要： The present invention relates to a method for detecting an electrically conducting target in soil, including the steps of generating a repeating transmit signal cycle of a fundamental period using transmit electronics, the repeating transmit signal cycle including a first period and a second period within each fundamental period; generating a transmit magnetic field using a magnetic field transmitter, based on the repeating transmit signal cycle, for transmission into the soil; receiving a receive magnetic field using a magnetic field receiver; producing a receive signal induced by the receive magnetic field; arranging for a current flowing through the magnetic field transmitter to flow to a first potential through a damping resistor during the second period for providing a damping effect on the current flowing through the magnetic field transmitter; arranging for the current flowing through the magnetic field transmitter to flow to a second potential, predominantly through an alternative path with a lower resistance than the damping resistor during the first period; monitoring the current flowing through the magnetic field transmitter to provide a control signal, the control signal, in effect, causing the second period to begin when the current flowing through the magnetic field transmitter is substantially zero; and processing the receive signal during at least part of the repeating transmit signal cycle to produce an indicator signal indicating the presence of an electrically conducting target when the target is within the influence of the transmit magnetic field.

摘要翻译： 本发明涉及一种用于检测土壤中导电目标的方法，包括以下步骤：使用发射电子装置产生基本周期的重复发射信号周期，所述重复发射信号周期包括每个基波内的第一周期和第二周期 期; 基于所述重复的发射信号周期，使用磁场发射器产生发射磁场，以传输到所述土壤中; 使用磁场接收器接收接收磁场; 产生由接收磁场引起的接收信号; 在第二周期期间布置流过磁场发射器的电流通过阻尼电阻器流动到第一电位，以对流过磁场发射器的电流提供阻尼效应; 排列流过磁场发射器的电流流动到第二电位，主要通过在第一周期期间具有比阻尼电阻器更低的电阻的替代路径; 监测流过磁场发射器的电流以提供控制信号，当流过磁场发射器的电流基本上为零时，控制信号实际上引起第二周期开始; 以及在所述重复发射信号周期的至少部分期间处理所述接收信号，以产生指示信号，所述指示信号指示所述目标在所述发射磁场的影响范围内时存在导电目标。