CN-224233678-U - Optical coupling simulator

CN224233678UCN 224233678 UCN224233678 UCN 224233678UCN-224233678-U

Abstract

The embodiment of the disclosure provides an optocoupler simulator, which comprises a bias voltage/current generating circuit, a current limiting circuit, an oscillator circuit, a coupling transmission circuit, a rectifying circuit, a driving circuit, a control circuit and an output circuit, wherein the bias voltage/current generating circuit provides bias voltage and bias current according to input voltage, the current limiting circuit limits maximum working current according to the bias current, the oscillator circuit generates an alternating current oscillating signal, the coupling transmission circuit couples the alternating current oscillating signal to obtain an alternating current oscillating coupling signal, the rectifying circuit rectifies the alternating current oscillating coupling signal into a direct current voltage signal, the driving circuit carries out boosting treatment on the direct current voltage signal, the direct current voltage signal and the boosted direct current voltage signal are coupled to an input end of the control circuit, and the control circuit controls the driving circuit to provide driving voltage for the output circuit according to the direct current voltage signal so as to start the output circuit, and the requirements of high working speed can be met while low-power consumption working is met.

Inventors

YANG JING
ZHANG JIANGFENG
MA CHUNYU
MEI DANGMIN

Assignees

北京中科格励微科技有限公司

Dates

Publication Date: 20260512
Application Date: 20250522

Claims (10)

1. The optocoupler simulator is characterized by comprising a bias voltage/current generating circuit, a current limiting circuit, an oscillator circuit, a coupling transmission circuit, a rectifying circuit, a driving circuit, a control circuit and an output circuit; The voltage output end of the bias voltage/current generating circuit is connected with the power end of the current limiting circuit, the current output end of the bias voltage/current generating circuit is connected with the input end of the current limiting circuit, the output end of the current limiting circuit is connected with the input end of the coupling transmission circuit through the oscillator circuit, the output end of the coupling transmission circuit is connected with the input end of the driving circuit and the control end of the control circuit through the rectifying circuit, the output end of the driving circuit is connected with the input end of the control circuit, and the output end of the control circuit is connected with the control end of the output circuit; The bias voltage/current generating circuit is configured to provide bias voltage and bias current according to input voltage, the current limiting circuit is configured to limit maximum working current according to the bias current, the oscillator circuit is configured to generate alternating current oscillation signals, the coupling transmission circuit is configured to couple the alternating current oscillation signals to obtain alternating current oscillation coupling signals; The rectification circuit is configured to rectify the alternating-current oscillation coupling signal into a direct-current voltage signal, the driving circuit is configured to boost the direct-current voltage signal and couple the direct-current voltage signal and the boosted direct-current voltage signal to the input end of the control circuit, and the control circuit is configured to control the driving circuit to provide driving voltage for the output circuit according to the direct-current voltage signal so as to start the output circuit.
2. The optocoupler simulator of claim 1, wherein the bias voltage/current generation circuit is comprised of an open loop LDO circuit configured to step down the input voltage to obtain the bias voltage and a bandgap reference circuit configured to provide the bias current.
3. The optocoupler simulator of claim 1, wherein the current limiting circuit comprises a first transistor and a second transistor; The first end of the first transistor and the first end of the second transistor are connected with the voltage output end of the bias voltage/current generating circuit, the control end of the first transistor is connected with the second end of the first transistor, the control end of the second transistor and the current output end of the bias voltage/current generating circuit, and the second end of the second transistor is connected with the input end of the oscillator circuit.
4. The optocoupler simulator of claim 1, wherein the drive circuit comprises a first drive circuit and a second drive circuit; The first control end of the first driving circuit is connected with the normal phase output end of the coupling transmission circuit, the second control end of the first driving circuit is connected with the reverse phase output end of the coupling transmission circuit, the input end of the first driving circuit and the input end of the second driving circuit are connected with the output end of the rectifying circuit, and the output end of the first driving circuit and the output end of the second driving circuit are connected with the input end of the control circuit; The first driving circuit is configured to boost the direct-current voltage signal and output a first driving voltage according to the positive alternating-current oscillation coupling signal and the negative alternating-current oscillation coupling signal, and the second driving circuit is configured to output a second driving voltage.
5. The optocoupler simulator of claim 4 wherein the first drive circuit comprises a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, a first capacitance, a second capacitance, and an output load capacitance; The first end of the third transistor and the first end of the fourth transistor are connected with the output end of the rectifying circuit, the first end of the fifth transistor and the first end of the sixth transistor are connected with the input end of the control circuit, the first end of the sixth transistor is connected with an output reference ground through the output load capacitor, the lower polar plate of the first capacitor is connected with the non-inverting output end of the coupling transmission circuit, and the lower polar plate of the second capacitor is connected with the inverting output end of the coupling transmission circuit; The control end of the third transistor is connected with the control end of the fifth transistor, the second end of the fourth transistor, the second end of the sixth transistor and the upper polar plate of the second capacitor, and the second end of the third transistor is connected with the second end of the fifth transistor, the control end of the fourth transistor, the control end of the sixth transistor and the upper polar plate of the first capacitor.
6. The optocoupler simulator of claim 4, wherein the second drive circuit comprises a switching diode, an anode of the switching diode being connected to the output of the rectifier circuit and a cathode of the switching diode being connected to the input of the control circuit.
7. The optocoupler simulator of claim 1, wherein the control circuit comprises a first control circuit and a second control circuit; the input end of the first control circuit is connected with the output end of the rectifying circuit, the output end of the first control circuit is connected with the control end of the second control circuit, the input end of the second control circuit is connected with the output end of the driving circuit, and the output end of the second control circuit is connected with the control end of the output circuit; The first control circuit is configured to perform logic operation on the direct-current voltage signal to obtain a driving control signal, and the second control circuit is configured to conduct the output end of the driving circuit and the control end of the output circuit when the driving control signal is a pull-up control signal.
8. The optocoupler simulator of claim 7, wherein the first control circuit comprises an inverter circuit having an input connected to the output of the rectifier circuit and an output connected to the control of the second control circuit.
9. The optocoupler simulator of claim 7, wherein the second control circuit comprises a seventh transistor and an eighth transistor; The first end of the seventh transistor is connected with the output end of the driving circuit, the second end of the seventh transistor is connected with the second end of the eighth transistor and the control end of the output circuit, the first end of the eighth transistor is connected with the output reference ground, and the control end of the seventh transistor and the control end of the eighth transistor are connected with the output end of the first control circuit.
10. The optocoupler simulator of claim 7, wherein the first control circuit comprises a brown-out lockout circuit, a level detection circuit, and a logic circuit; The output end of the undervoltage locking circuit is connected with the first input end of the logic circuit, the output end of the level detection circuit is connected with the second input end of the logic circuit, the third input end of the logic circuit is connected with the output end of the rectifying circuit, and the output end of the logic circuit is connected with the control end of the second control circuit; The logic circuit is configured to generate the drive control signal from the direct current voltage signal when a power supply voltage is greater than a first voltage threshold and a voltage difference of the positive alternating current oscillation signal and the inverted alternating current oscillation signal is greater than a second voltage threshold.

Description

Optical coupling simulator Technical Field Embodiments of the present disclosure relate to the field of integrated circuit technology, and more particularly, to an optical coupling simulator. Background In electronic devices such as electronic systems and medical devices, an isolator is usually incorporated in the electronic device in order to eliminate noise of signals and protect devices and users from high voltage. However, the optocoupler has the defects of easy aging, high power consumption, short service life and the like, and limits the use scene of the optocoupler. Therefore, the isolator manufactured by the integrated circuit process can be selected, and the isolator device has more advantages in the aspects of power consumption, performance, reliability and the like and can be used for replacing an optical coupler. However, at present, an optical coupling analog structure for replacing an optical coupler cannot meet the requirement of high working speed when meeting low power consumption working, and cannot meet the requirement of low power consumption working when meeting high working speed, namely cannot be compatible with the requirements of low power consumption and high speed transmission. Disclosure of utility model The embodiment of the disclosure provides an optical coupling simulator which can meet the requirement of high working speed while meeting the requirement of low-power consumption. In a first aspect, the present disclosure provides an optocoupler simulator comprising a bias voltage/current generating circuit, a current limiting circuit, an oscillator circuit, a coupling transmission circuit, a rectifying circuit, a driving circuit, a control circuit, and an output circuit. The output end of the coupling transmission circuit is connected with the input end of the driving circuit and the control end of the control circuit through the rectifying circuit, the output end of the driving circuit is connected with the input end of the control circuit, and the output end of the control circuit is connected with the control end of the output circuit. The bias voltage/current generating circuit is configured to provide a bias voltage and a bias current in accordance with an input voltage. The current limiting circuit is configured to limit a maximum operating current in dependence upon the bias current. The oscillator circuit is configured to generate an alternating current oscillating signal. The coupling transmission circuit is configured to couple the alternating current oscillation signal to obtain an alternating current oscillation coupling signal. The rectification circuit is configured to rectify the ac oscillation coupled signal into a dc voltage signal. The driving circuit is configured to boost the direct current voltage signal, and couple the direct current voltage signal and the boosted direct current voltage signal to an input end of the control circuit. The control circuit is configured to control the driving circuit to supply a driving voltage to the output circuit according to the direct-current voltage signal so as to turn on the output circuit. In some embodiments of the present disclosure, the bias voltage/current generating circuit is comprised of an open loop LDO circuit and a bandgap reference circuit. The open loop LDO circuit is configured to step down the input voltage to obtain the bias voltage, and the bandgap reference circuit is configured to provide the bias current. In some embodiments of the present disclosure, the current limiting circuit includes a first transistor and a second transistor. The first end of the first transistor and the first end of the second transistor are connected with the voltage output end of the bias voltage/current generating circuit, the control end of the first transistor is connected with the second end of the first transistor, the control end of the second transistor and the current output end of the bias voltage/current generating circuit, and the second end of the second transistor is connected with the input end of the oscillator circuit. In some embodiments of the present disclosure, the driving circuit includes a first driving circuit and a second driving circuit. The first control end of the first driving circuit is connected with the normal phase output end of the coupling transmission circuit, the second control end of the first driving circuit is connected with the reverse phase output end of the coupling transmission circuit, the input end of the first driving circuit and the input end of the second driving circuit are connected with the output end of the rectifying circuit, and the output end of the first driving circuit and the output end of the second driving circuit are connected with the input end of the control circuit. The first driving circuit is configured to boost the direct-current voltage signal and output a first driving voltage according to the positive alternating-current oscillation coupling signal and th