公开(公告)号：US08847805B1

公开(公告)日：2014-09-30

申请号：US13919747

申请日：2013-06-17

Applicant: Power Integrations, Inc.

Inventor： Frank J. Schulz

IPC: H03M3/00

CPC classification number: H03M3/39 ,  H03M3/322 ,  H03M3/43 ,  H03M3/496

Abstract: Measurement circuits having a delta-sigma modulator are disclosed. One example measurement circuit includes a low pass filter coupled to receive an input voltage, a switched-capacitor integrator circuit, and a switched comparator circuit. The measurement circuit may generate a digital output made up of a sequence of logic high and logic low levels that are representative of a scaled value of the input voltage output by the low pass filter circuit. Also, by virtue of its switched-capacitor configuration, the electric charge received by the switched difference amplifier circuit may be returned to the input in a manner such that the input to the delta-sigma modulator takes little to no average current from the voltage it measures. In other words, the delta-sigma modulator may have a high input impedance by virtue of its switched-capacitor circuit configuration.

Abstract translation: 公开了具有Δ-Σ调制器的测量电路。 一个示例性测量电路包括耦合以接收输入电压的低通滤波器，开关电容积分器电路和开关比较器电路。 测量电路可以产生由代表由低通滤波器电路输出的输入电压的定标值的逻辑高电平和逻辑低电平序列组成的数字输出。 此外，由于其开关电容器配置，由开关差分放大器电路接收的电荷可以以这样的方式返回到输入，使得对Δ-Σ调制器的输入几乎不需要与电压的平均电流 措施。 换句话说，Δ-Σ调制器可以通过其开关电容器电路配置具有高输入阻抗。

公开(公告)号：US09118343B2

公开(公告)日：2015-08-25

申请号：US14470826

申请日：2014-08-27

Applicant: Power Integrations, Inc.

Inventor： Frank J. Schulz

IPC: H03M3/00

CPC classification number: H03M3/39 ,  H03M3/322 ,  H03M3/43 ,  H03M3/496

Abstract: Measurement circuits having a delta-sigma modulator are disclosed. One example measurement circuit includes a low pass filter coupled to receive an input voltage, a switched-capacitor integrator circuit, and a switched comparator circuit. The measurement circuit may generate a digital output made up of a sequence of logic high and logic low levels that are representative of a scaled value of the input voltage output by the low pass filter circuit. Also, by virtue of its switched-capacitor configuration, the electric charge received by the switched difference amplifier circuit may be returned to the input in a manner such that the input to the delta-sigma modulator takes little to no average current from the voltage it measures. In other words, the delta-sigma modulator may have a high input impedance by virtue of its switched-capacitor circuit configuration.

Abstract translation: 公开了具有Δ-Σ调制器的测量电路。 一个示例性测量电路包括耦合以接收输入电压的低通滤波器，开关电容积分器电路和开关比较器电路。 测量电路可以产生由代表由低通滤波器电路输出的输入电压的定标值的逻辑高电平和逻辑低电平序列组成的数字输出。 此外，由于其开关电容器配置，由开关差分放大器电路接收的电荷可以以这样的方式返回到输入，使得对Δ-Σ调制器的输入几乎不需要与电压的平均电流 措施。 换句话说，Δ-Σ调制器可以通过其开关电容器电路配置具有高输入阻抗。