The invention relates to a signal isolation and conversion circuit and a control apparatus. The signal isolation and conversion circuit comprises a pulse signal generating circuit and an optical coupling complementary isolation circuit connected with the pulse signal generating circuit; the pulse signal generating circuit is used for receiving an input signal and converting the input signal into a pulse signal; the optical coupling complementary isolation circuit comprises at least two photocouplers, and the at least two photocouplers are switched on or off according to the pulse signal so as to transmit the pulse signal to the output end of the signal isolation and conversion circuit. By arranging the optical coupling complementary isolation circuit, the problems of transmission delay, transmission signal distortion and light attenuation and temperature drift of the light-emitting diode in the optocoupler are effectively solved, the timeliness of isolation signal transmission is improved.

A control circuit for an electronic switch includes a first power switch receiving a common input signal and a first voltage input and a second power switch receiving the common input signal and a second voltage input. The first and second power switches switchably connect the first voltage input and the second voltage input, respectively, to a common output in response to the common input signal. The second voltage input is opposite in polarity to the first voltage input, and the first power switch and the second power switch are configured to asynchronously connect the first voltage input and the second voltage input, respectively, to the common output in response to the common input signal, the electronic switch being switched according to the first voltage input or the second voltage input being connected to the common output.

A signal isolation system includes an external device; and a signal isolation circuit, coupled to the external device, including a control circuit, configured to operate the signal isolation circuit in an input mode or an output mode according to a status of the external device; a digital input/output circuit, configured to input/output signal based on the input mode or the output mode determined by the control circuit; and an input/output port, coupled to the digital input/output circuit, configured to be an input port or an output port according to the input mode or the output mode determined by the control circuit.

The invention relates to a signal isolation and conversion circuit and a control apparatus. The signal isolation and conversion circuit comprises a pulse signal generating circuit and an optical coupling complementary isolation circuit connected with the pulse signal generating circuit; the pulse signal generating circuit is used for receiving an input signal and converting the input signal into a pulse signal; the optical coupling complementary isolation circuit comprises at least two photocouplers, and the at least two photocouplers are switched on or off according to the pulse signal so as to transmit the pulse signal to the output end of the signal isolation and conversion circuit. By arranging the optical coupling complementary isolation circuit, the problems of transmission delay, transmission signal distortion and light attenuation and temperature drift of the light-emitting diode in the optocoupler are effectively solved, the timeliness of isolation signal transmission is improved.

In a switching device and a system for converting a differential input signal into a ground-referenced output signal using a control signal, error states are detected, and detected error states lead to the deactivation of the ground-referenced output signal and are indicated on the control signal in addition.

A signal isolation system includes an external device; and a signal isolation circuit, coupled to the external device, including a control circuit, configured to operate the signal isolation circuit in an input mode or an output mode according to a status of the external device; a digital input/output circuit, configured to input/output signal based on the input mode or the output mode determined by the control circuit; and an input/output port, coupled to the digital input/output circuit, configured to be an input port or an output port according to the input mode or the output mode determined by the control circuit.

Provided are a pulse signal output circuit (50) and a flowmeter (11). The pulse signal output circuit (50) includes a signal-receiving module (21), a photoelectrical coupler (22), a signal conversion module (23); where the signal-receiving module (21) is connected to the photoelectrical coupler (22), and the photoelectrical coupler (22) is connected to the signal conversion module (23); the signal-receiving module (21) is configured to receive a source pulse signal acquired by the flowmeter (11), and send the source pulse signal to the photoelectrical coupler (22); the photoelectrical coupler (22) is configured to perform electrical-optical-electrical conversion processing on the received source pulse signal to obtain an electrical signal, and send the electrical signal to the signal conversion module (23); the signal conversion module (23) is configured to perform conversion processing on the received electrical signal to obtain and output an output pulse signal (41) corresponding to the source pulse signal.

An example apparatus includes: a current mirror having first and second outputs; oscillator circuitry including: a first transistor having a first terminal coupled to the first output of the current mirror, having a second terminal, and having a control terminal; and a second transistor having a first terminal coupled to the first output of the current mirror, having a second terminal coupled to the control terminal and the second terminal of the first transistor, and having a control terminal coupled to the second terminals of the first and second transistors; and current shunt circuitry having a terminal coupled to the second output of the current mirror.

A method of operating a motor using a motor controller module, wherein the motor controller module is configured for electrical communication with a power source and the motor, the method having the steps of: obtaining an input signal from the power source, generating an output signal by manipulating the input signal to skip at least a portion of a signal cycle of the input signal, and transmitting the output signal to the motor. The motor controller module may be configured to manipulate the input signal to generate the output signal by selectively actuating a plurality of switches to skip the at least a portion of the input signal. By selectively skipping whole or partial signal cycles in the output signal while sufficient motor operating conditions are achieved, the amount of power sent to the motor may be reduced, thus saving energy and reducing motor heating and wear.

Provided are a pulse signal output circuit and a flowmeter. The pulse signal output circuit includes a signal-receiving module, a photoelectrical coupler, a signal conversion module; where the signal-receiving module is connected to the photoelectrical coupler, and the photoelectrical coupler is connected to the signal conversion module; the signal-receiving module is configured to receive a source pulse signal acquired by the flowmeter, and send the source pulse signal to the photoelectrical coupler; the photoelectrical coupler is configured to perform electrical-optical-electrical conversion processing on the received source pulse signal to obtain an electrical signal, and send the electrical signal to the signal conversion module; the signal conversion module is configured to perform conversion processing on the received electrical signal to obtain and output an output pulse signal corresponding to the source pulse signal.