模拟信号输出电路及变频器

Abstract

本申请涉及一种模拟信号输出电路及变频器。该模拟信号输出电路中，电压调整电路，用于接收数字电压信号，并输出模拟电压信号；电压转电流电路，与电压调整电路电连接；电压转电流电路用于根据模拟电压信号输出模拟电流信号；继电器与电压调整电路、电压转电流电路分别电连接；继电器用于根据接收到的继电器驱动信号，选择模拟电压信号或模拟电流信号作为模拟信号输出。

Claims

1. An analog signal output circuit, characterized by comprising: include: A voltage adjustment circuit is used to receive digital voltage signals and output analog voltage signals; A voltage-to-current conversion circuit is electrically connected to the voltage adjustment circuit; the voltage-to-current conversion circuit is used to receive the analog voltage signal and output an analog current signal. The relay is electrically connected to the voltage adjustment circuit and the voltage-to-current conversion circuit, respectively. The relay is used to select either the analog voltage signal or the analog current signal as the analog signal output based on the received relay drive signal.

2. The analog signal output circuit according to claim 1, characterized in that, It also includes a relay control circuit, which is electrically connected to the relay; the relay control circuit is used to receive relay control signals and output relay drive signals.

3. The analog signal output circuit according to claim 2, characterized by The relay includes a signal control terminal, a first switch contact, a second switch contact, and a common terminal; the relay drive signal includes a first drive signal and a second drive signal. The signal control terminal is electrically connected to the relay control circuit; the first switch contact is electrically connected to the voltage adjustment circuit, and the second switch contact is electrically connected to the voltage-to-current conversion circuit. When the relay drive signal is the first drive signal, the first switch contact is connected to the common terminal; When the relay drive signal is the second drive signal, the second switch contact is connected to the common terminal.

4. The analog signal output circuit according to claim 2, characterized by The relay control circuit includes a switching transistor; The switching transistor includes a signal control terminal, a first switching terminal, and a second switching terminal; the signal control terminal is used to receive a relay control signal, which includes a first control signal and a second control signal; the first switching terminal is electrically connected to a reference ground; the second switching terminal is electrically connected to the relay and is used to output a relay drive signal. The relay drive signal includes a first drive signal and a second drive signal; When the relay control signal is the first control signal, the first switch terminal and the second switch terminal are turned on, so that the second switch terminal outputs the first drive signal; When the relay control signal is the second control signal, the first switch terminal and the second switch terminal are disconnected, so that the second switch terminal outputs the second drive signal.

5. The analog signal output circuit according to any one of claims 1 to 4, characterized by, The voltage adjustment circuit includes: A low-pass filter circuit is used to filter the digital input signal and output a first analog voltage signal, wherein the digital input signal is the signal transmitted from the voltage adjustment circuit to the low-pass filter circuit according to the digital voltage signal; A voltage amplifier circuit, electrically connected to the low-pass filter circuit, is used to amplify the first analog voltage signal and output a second analog voltage signal, wherein the analog voltage signal is the signal output by the voltage adjustment circuit based on the second analog voltage signal.

6. The analog signal output circuit according to claim 5, characterized by The filtering circuit includes a second-order RC low-pass filter circuit.

7. The analog signal output circuit according to claim 5, characterized by The voltage amplifier circuit includes a differential amplifier circuit for differentially amplifying the first analog voltage signal.

8. The analog signal output circuit according to any one of claims 1 to 4, characterized by, The voltage-to-current conversion circuit includes: A proportional conversion circuit, electrically connected to the voltage adjustment circuit, is used to convert the analog voltage signal into the analog current signal for output; the analog current signal and the analog voltage signal have a linear proportional relationship. A current amplifier circuit, electrically connected to the proportional conversion circuit, is used to amplify the analog current signal before the analog current signal is output.

9. A frequency converter, characterized in that include: The analog signal output circuit as described in any one of claims 1 to 8.

10. The frequency converter of claim 9, wherein, include: An actuator; the actuator is electrically connected to the analog output terminal of the analog signal output circuit so that the actuator operates under the drive of the analog signal; The controller is electrically connected to the analog signal output circuit and is used to output digital voltage signals and relay control signals to the analog signal output circuit. Analog acquisition terminal; used to electrically connect the controller and the actuator to acquire the operating information of the actuator under the drive of the analog signal and feed it back to the controller.

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