CN214177294U - Bidirectional isolation circuit, analog output circuit and chip - Google Patents
Bidirectional isolation circuit, analog output circuit and chip Download PDFInfo
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- CN214177294U CN214177294U CN202022537757.8U CN202022537757U CN214177294U CN 214177294 U CN214177294 U CN 214177294U CN 202022537757 U CN202022537757 U CN 202022537757U CN 214177294 U CN214177294 U CN 214177294U
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Abstract
The utility model discloses a two-way buffer circuit, analog output circuit and chip relates to data transmission technical field, and two-way buffer circuit includes two opto-couplers, the input of second opto-coupler is connected to the output of first opto-coupler, the output of the first opto-coupler of input connection of second opto-coupler, and two opto-couplers meet end to end and form the closed loop, and the signal end is regarded as respectively to the input of first opto-coupler, second opto-coupler, realizes the isolation and the two-way communication of both sides circuit. The analog quantity output circuit based on the IIC protocol comprises a main control circuit and at least one transmission circuit, wherein each transmission circuit is connected with the main control circuit respectively, each transmission circuit comprises a photoelectric isolation circuit, a digital-to-analog conversion circuit and a voltage-current conversion circuit which are connected in sequence, and the photoelectric isolation circuits are used for converting serial port data of the main control circuit into signals transmitted by the IIC protocol, so that the main control circuit is isolated from the digital-to-analog conversion circuits, the circuit structure is simplified, and the cost is reduced.
Description
Technical Field
The utility model belongs to the technical field of the data transmission technique and specifically relates to a two-way buffer circuit, analog output circuit and chip are related to.
Background
At present, in the data transmission process, in order to reduce the mutual influence between a data control sending end and a data control receiving end, particularly the mutual interference between digital quantity and analog quantity, the digital quantity and the analog quantity are isolated, a common isolation circuit comprises an optical coupling isolation circuit and a magnetic isolation circuit, an IIC protocol is used for data transmission, the isolation circuit is mostly used for master-slave communication between a master control circuit and slave devices, the isolation circuit is used in the small data quantity occasion, the transmission distance is short, and only one host can exist at any time. The IIC bus is very simple in physical connection, consisting of SDA (serial data line) and SCL (serial clock line) and pull-up resistor, respectively. The IIC communication mode is half duplex, only one SDA line is provided, and only one-way communication can be realized at the same time.
In a DCS system, when an optical coupler is used as an isolation circuit, a slave controller required in a transmission circuit is used for converting serial port data into an IIC protocol for transmission, and the circuit is complex in structure and high in cost; when the magnetic isolation circuit is adopted, serial port data can be directly converted into an IIC protocol for transmission, but the price of the magnetic isolator is higher, and the circuit cost is increased.
Therefore, how to implement low-cost isolation in data transmission is a problem to be solved urgently at present.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a two-way buffer circuit analog output circuit and chip. Two optocouplers are connected end to realize isolation, isolation is realized during data bidirectional transmission, and serial port data is converted to be in accordance with an IIC protocol for transmission; the cost reduction of the isolation circuit is ensured due to the low cost of the optical coupler, the low-cost safe isolation among channels is realized in a DCS system, and the circuit structure is simplified.
In a first aspect, the above mentioned utility model aims at realizing through following technical scheme:
the output of the first optical coupler is connected with the input of the second optical coupler, the input of the second optical coupler is connected with the output of the first optical coupler, the two optical couplers are connected end to form a closed loop, and the inputs of the first optical coupler and the second optical coupler are respectively used as signal ends to realize isolation and two-way communication of circuits on two sides.
The utility model discloses further set up to: the first optical coupler and the second optical coupler respectively comprise four pins, a first input end of the first optical coupler is connected with a first output end of the second optical coupler through a first resistor string, and a first input end of the second optical coupler is connected with a first output end of the first optical coupler through a second resistor string; the first resistor string comprises a first resistor and a fourth resistor which are connected in series, one end of the first resistor is connected with a first input end of the first optocoupler, one end of the fourth resistor is connected with a first output end of the second optocoupler, and a connection point of the first resistor and the fourth resistor serves as a first transmission end; similarly, the second resistor string comprises a third resistor and a sixth resistor which are connected in series, one end of the third resistor is connected with the first output end of the first optical coupler, one end of the sixth resistor is connected with the first input end of the second optical coupler, and the connection point of the third resistor and the sixth resistor serves as a second transmission end; the first output end of the second optocoupler is connected with a first power supply through a fifth resistor, and the first output end of the first optocoupler is connected with a second power supply through a second resistor; the other ends of the optical coupler are respectively connected with respective ground ends.
In a second aspect, the above object of the present invention can be achieved by the following technical solutions:
a kind of two-way isolating circuit based on IIC agreement, IIC agreement includes serial data SDA, serial clock SCL, in the isolating circuit of the serial clock SCL, include the third optocoupler, is used for realizing isolating and unidirectional communication; in serial data line SDA buffer circuit, including fourth, fifth opto-coupler, the input of fifth opto-coupler is connected to the output of fourth opto-coupler, and the output of fifth opto-coupler is connected to the input of fourth opto-coupler, and two opto-couplers meet end to end and form the closed loop, and the input of fourth opto-coupler, fifth opto-coupler is as the signal end respectively for realize the isolation and the two-way communication of both sides circuit.
Third aspect, the utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:
the utility model provides an analog output circuit for DCS system based on IIC agreement, includes main control circuit, at least one transmission circuit, and each transmission circuit is connected with main control circuit respectively, transmission circuit is including photoelectric isolation circuit, digital analog conversion circuit, the voltage current conversion circuit that connects gradually, and photoelectric isolation circuit is used for converting main control circuit's serial ports data into the signal of transmission with the IIC agreement, realizes that main control circuit and digital analog conversion circuit keep apart.
The utility model discloses further set up to: the digital-to-analog conversion circuit comprises a digital-to-analog conversion chip and is used for converting the digital signals transmitted by the main control circuit into analog signals.
The utility model discloses further set up to: the photoelectric isolation circuit comprises the IIC protocol-based bidirectional isolation circuit.
The utility model discloses further set up to: the voltage-current conversion circuit comprises a voltage follower circuit and a current conversion circuit which are sequentially connected, wherein the voltage follower circuit comprises a follower circuit, the positive input end of the follower is connected with the output end of the digital-analog conversion circuit through a first resistor, and the negative input end and the output end of the follower are respectively connected with the current conversion circuit.
The utility model discloses further set up to: the current conversion circuit comprises an N-type tube, a P-type tube and an amplifier; the control end of the P-type tube is connected with the output end of the amplifier, the input end of the P-type tube is connected with the negative input end of the amplifier and one end of the first resistor, and the output end of the P-type tube is connected with one end of the first capacitor and the output end of the voltage-current conversion circuit; the control end of the N-type tube is connected with the output end of the voltage follower, the output end of the N-type tube is connected with the negative input end of the follower and one end of the sixth resistor, and the input end of the N-type tube is connected with the positive input end of the amplifier and one end of the second resistor; the other end of the first capacitor and the other end of the sixth resistor are grounded; the other end of the first resistor and the other end of the second resistor are connected with the positive end of the power supply.
In a fourth aspect, the above object of the present invention can be achieved by the following technical solutions:
an isolated chip comprises the bidirectional isolation circuit.
Compared with the prior art, the beneficial technical effects of this application do:
1. according to the bidirectional data transmission device, two optocouplers are connected end to end, the input end of the first optocoupler is connected with the output end of the second optocoupler, and the input end of the second optocoupler is connected with the output end of the first optocoupler, so that bidirectional isolation is realized, and bidirectional data transmission isolation is ensured;
2. furthermore, the optical coupler is used for isolation, so that the cost of the isolation circuit is reduced;
3. furthermore, the double isolation circuits are applied to the DCS, serial port data of the main control circuit are converted into data meeting the IIC protocol, isolation of the main control circuit and the analog circuit is achieved, the circuits are simplified, and cost is reduced.
Drawings
FIG. 1 is a schematic diagram of a bidirectional isolation circuit according to an embodiment of the present application;
FIG. 2 is a schematic diagram of an analog output circuit according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a clock signal isolation circuit according to an embodiment of the present application;
FIG. 4 is a schematic diagram of an analog-to-digital conversion circuit according to an embodiment of the present application;
fig. 5 is a schematic diagram of a voltage-to-current conversion circuit according to an embodiment of the present application.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Detailed description of the preferred embodiment
The utility model provides a two-way buffer circuit, as shown in fig. 1, including two opto-couplers U1, U2, opto-coupler U1's input is connected with opto-coupler U2's output, and opto-coupler U2's input is connected with opto-coupler U1's output, forms the end to end of two opto-couplers.
Specifically, a first input end of an input side of the optical coupler U1 is connected with the data end SDA through a first resistor R1, and a second input end of the input side is connected with a VCC power ground; the first output end of the output side of the optocoupler U2 is connected with the data end SDA through a fourth resistor R4 and is connected with the positive end of a VCC power supply through a fifth resistor R5, and the second output end of the output side is connected with the ground of the VCC power supply.
Correspondingly, a first input end of an input side of the optical coupler U2 is connected with a data end SDA-A through a sixth resistor R6, and a second input end of the input side is connected with a VDD power ground; a first output end of an output side of the optical coupler U1 is connected with a data end SDA-A through a third resistor R3, and is connected with a positive end of a VDD power supply through a second resistor R2, and a second output end of the output side is connected with a VDD power ground.
The SDA input signal is transmitted to the SDA-A end through the optical coupler U1, and the SDA-A end input signal is transmitted to the SDA end through the optical coupler U2, so that bidirectional isolation of the circuit is achieved.
Detailed description of the invention
The application relates to a bidirectional isolation circuit based on an IIC protocol, wherein the IIC protocol comprises serial data SDA and a serial clock SCL. In the isolation circuit of the serial clock SCL, because the serial clock is unidirectional data, the isolation transmission of the serial clock data can be realized only by adopting one optical coupler for isolation.
And the serial data SDA needs bidirectional transmission and comprises a fourth optical coupler and a fifth optical coupler, wherein the output of the fourth optical coupler is connected with the input of the fifth optical coupler, the input of the fifth optical coupler is connected with the output of the fourth optical coupler, the two optical couplers are connected end to form a closed loop, and the inputs of the fourth optical coupler and the fifth optical coupler are respectively used as signal ends for realizing the isolation and bidirectional communication of circuits on two sides.
Specifically, the isolation circuit structure in the serial data SDA is the same as that in embodiment one.
Detailed description of the preferred embodiment
The analog quantity output circuit based on the IIC protocol for the DCS comprises a main control circuit and transmission circuits 1-n, wherein the transmission circuits are the same in structure and are connected with the main control circuit respectively, and the transmission circuits are shown in fig. 2.
The transmission circuit 1 comprises a photoelectric isolation circuit 1, a digital-to-analog conversion circuit 1 and a voltage-current conversion circuit 1 which are connected in sequence, and the transmission circuit 2 comprises a photoelectric isolation circuit 2, a digital-to-analog conversion circuit 2 and a voltage-current conversion circuit 2 which are connected in sequence, and so on.
The following description will be given taking the transmission circuit 1 as an example.
The main control circuit transmits data to the photoelectric isolation circuit 1 in a serial port mode, and the photoelectric isolation circuit 1 is used for isolating digital signals from analog signals; the digital-to-analog conversion circuit 1 is used for outputting different voltages according to the data values on the IIC and converting digital quantity into analog quantity; the voltage-current conversion circuit 1 is used for converting a voltage signal into a current signal.
The photoelectric isolation circuit comprises an isolation circuit used for a clock signal SCL and a bidirectional isolation circuit used for a data signal SDA. The bidirectional isolation circuit for the data signal SDA comprises two optical couplers, and the connection of the two optical couplers is shown in figure 1.
The isolation circuit for the clock signal SCL, as shown in fig. 3, includes an optical coupler, a first input terminal of an input side of which is connected to one end of a resistor R7, the other end of the resistor R7 is used for being connected to the SCL signal output terminal of the main control circuit, and a second input terminal of the input side is connected to the digital signal ground; the first output end of the output side is connected with a power supply VDD, the second output end is connected with a VDD power ground GND-A through a resistor R8, and the second output end is used as an output end of an SCL-A signal.
The SCL signal is transmitted to the input end of the optocoupler U3 through the resistor R7, and is transmitted to an SCL-A end from the output end of the U3 after being coupled by the optocoupler U3.
When the input signal SCL is at a high level, the current passes through the resistor R7 and the light emitting diode inside the optocoupler U3 to GND, forming a current loop, so that the light emitting diode inside the optocoupler U3 emits light. After the light emitting diode in the optocoupler U3 emits light, a triode in the optocoupler U3 is in saturated conduction. After a triode in the optocoupler U3 is in saturated conduction, the voltage difference between two ends of the triode is very small, so that the voltage between two ends of the resistor R8 is very large, and the output end SCL _ A is high.
When the input signal SCL is at a low level, no current flows through the resistor R7 and the light emitting diode inside the optocoupler U3, so that a current loop cannot be formed, and the light emitting diode inside the optocoupler U3 does not emit light. The light emitting diode in the optocoupler U3 does not emit light, so that the triode in the optocoupler U3 is in a cut-off state. After the triode in the optocoupler U3 is cut off, the current on the branch is 0, so the voltages at the two ends of the resistor R8 are equal, and the output end SCL _ A is low.
The bidirectional isolation circuit for the data signal SDA comprises two optical couplers, and the connection of the two optical couplers is shown in figure 1.
The working principle is as follows:
the signal enters from the SDA end:
when the input signal SDA is at a high level, a current flows through the resistor R1 and the light emitting diode inside the optocoupler U12 to the ground GND to form a current loop, so that the light emitting diode inside the optocoupler U1 emits light. After the light emitting diode in the optocoupler U1 emits light, a triode in the optocoupler U1 is in saturated conduction. After a triode in the optocoupler U1 is in saturated conduction, the voltage difference between two ends of the triode is very small, so that the voltage between two ends of the resistor R2 is very large, and the output end SDA _ A is low. When SDA _ a is low, the light emitting diode in the optocoupler U2 cannot emit light, so the transistor in the optocoupler U2 is off. The triode in the optocoupler U2 is in a cut-off state, and the optocoupler U2 cannot pull down the SDA input signal, so that the SDA input signal can keep the original high level. Therefore, when the SDA terminal inputs a high level, the SDA _ a terminal can be kept low.
When the input signal SDA is at a low level, no current flows through the resistor R1 and the light emitting diode in the optocoupler U1, so that a current loop cannot be formed, and the light emitting diode in the optocoupler U1 does not emit light. And a light emitting diode in the optocoupler U1 does not emit light, so that a triode in the optocoupler U1 is cut off. After the triode in the optocoupler U1 is cut off, the voltage difference between two ends of the triode is very large, so that the voltage between two ends of the resistor R2 is very small, and the output end SDA _ A is high. When the SDA is high, the light emitting diode in the optocoupler U2 can emit light, and the triode in the optocoupler U2 is in a conducting state. The triode inside the optocoupler U2 is in a conducting state, and the optocoupler U2 cannot pull up the SDA input signal, so that the SDA input signal can be kept at an original low level. Therefore, when the SDA terminal inputs a low level, the SDA _ a terminal can be kept at a high level.
The signal enters from the SDA end:
when the input signal SDA _ A is in a high level, current flows to the GND _ A through the resistor R6 and the light emitting diode inside the optical coupler U2 to form a current loop, and the light emitting diode inside the optical coupler U2 emits light. After the light emitting diode in the optocoupler U2 emits light, a triode in the optocoupler U2 is in saturated conduction. After a triode in the optocoupler U2 is in saturated conduction, the voltage difference between two ends of the triode is very small, so that the voltage between two ends of the resistor R5 is very large, and the output end SDA is low. When the SDA is low, the light emitting diode in the optocoupler U1 cannot emit light, and the triode in the optocoupler U1 is in an off state. The triode in the optocoupler U1 is in a cut-off state, and the optocoupler U1 cannot pull down the SDA _ A input signal, so that the SDA _ A input signal can keep the original high level. Therefore, when the SDA _ a terminal inputs a high level, the SDA terminal can be kept low.
When the input signal SDA _ a is at a low level, no current flows through the resistor R6 and the light emitting diode inside the optocoupler U2, so that a current loop cannot be formed, and the light emitting diode inside the optocoupler U2 does not emit light. And a light emitting diode in the optocoupler U2 does not emit light, so that a triode in the optocoupler U2 is cut off. After the triode in the optocoupler U2 is cut off, the voltage difference between two ends of the triode is very large, so that the voltage between two ends of the resistor R5 is very small, and the output end SDA is high. When the SDA is high, a light emitting diode in the optical coupler U1 can emit light, and a triode in the optical coupler U1 is in a conducting state. The triode in the optocoupler U1 is in a conducting state, and the optocoupler U1 cannot pull up the SDA _ A input signal, so that the SDA _ A input signal can be kept at an original low level. Therefore, when the SDA _ a terminal inputs a low level, the SDA terminal can be kept at a high level.
The double-optical-coupling circuit connected end to end realizes the functions of bidirectional transmission and isolation of the SDA.
A digital-to-analog conversion (DAC) circuit, as shown in FIG. 4, includes a digital-to-analog conversion chip U4, an SCL-A signal output terminal from the optoelectronic isolation circuit connected to the SCL terminal of the digital-to-analog conversion chip U4, and an SDA-A output terminal connected to the SDA terminal of the digital-to-analog conversion chip U4 and connected to the positive terminal of the power supply VDD via pull-up resistors R9/R10, respectively, where VDD is 3.3V in this embodiment. The output terminal Vout of the digital-to-analog conversion chip U4 is connected to the input terminal of the voltage-to-current conversion circuit.
As shown in fig. 5, the voltage-current conversion circuit includes a voltage follower circuit and a current conversion circuit, the voltage follower circuit includes an amplifier U5A, a positive input terminal of the amplifier U5A is connected to an output terminal Vout of the digital-to-analog conversion circuit through a resistor R11, and a negative input terminal and an output terminal of the amplifier are respectively connected to the current conversion circuit.
The current conversion circuit comprises an amplifier U5B, an NPN transistor Q2 and a PNP transistor Q1. A control end (base) of the PNP triode Q1 is connected to the output end of the amplifier U5B, an input end (emitter) thereof is connected to the negative input end of the amplifier U5B and one end of the resistor R14, and an output end (collector) thereof is used as the output end of the voltage-current conversion circuit and is connected to one end of the capacitor C1; a control end (base) of the NPN triode Q2 is connected to the output end of the amplifier U5A, an output end (emitter) thereof is connected to the negative input end of the amplifier U5A and one end of the resistor 13, and an input end (collector) thereof is connected to the positive input end of the amplifier U5B and one end of the resistor 12; the other end of the capacitor C1 and the other end of the resistor 13 are grounded; the other end of the resistor R12 and the other end of the resistor R14 are connected with the positive end of the power supply.
The IIC interface transmits the transmitted digital quantity signal to a DAC chip U4; DAC chip U4 outputs a corresponding voltage signal. With the "virtual short" and "virtual break" of the operational amplifier, the input voltage signal is equal to the voltage across resistor R13. Based on the characteristic that the triode Ie = Ib + Ic, the current of Ib is negligibly small, so Ie = Ic can be considered; the voltage across resistor R13 is equal to the voltage across resistor R12. And because of the 'virtual short' of the operational amplifier, the voltage across the resistor R12 is equal to the voltage across R14. The DAC chip U4 outputs a corresponding voltage equal to the voltage across R14; the voltage value output by the DAC chip U4 is adjusted, and the voltage value at the two ends of the R14 is also adjusted; since the resistance of the R14 is fixed, the voltage across the R14 changes, and the current flowing through the R14 changes accordingly. And because the current Ie = Ic on the triode; the current output by Iout _ A is the current flowing through R14. Thereby realizing the function of converting voltage into current.
In the figure, the transistor Q2 and the transistor Q1 are both in an amplifying state.
Detailed description of the invention
The chip comprises a double-isolation circuit shown in fig. 1 and is used for isolating bidirectional communication signals.
The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.
Claims (8)
1. A bidirectional isolation circuit, comprising: the output of the first optical coupler is connected with the input of the second optical coupler, the input of the second optical coupler is connected with the output of the first optical coupler, the two optical couplers are connected end to form a closed loop, and the inputs of the first optical coupler and the second optical coupler are respectively used as signal ends to realize the isolation and the two-way communication of circuits on two sides.
2. The bi-directional isolation circuit of claim 1, wherein: the first optical coupler and the second optical coupler respectively comprise four pins, a first input end of the first optical coupler is connected with a first output end of the second optical coupler through a first resistor string, and a first input end of the second optical coupler is connected with a first output end of the first optical coupler through a second resistor string; the first resistor string comprises a first resistor and a fourth resistor which are connected in series, one end of the first resistor is connected with a first input end of the first optocoupler, one end of the fourth resistor is connected with a first output end of the second optocoupler, and a connection point of the first resistor and the fourth resistor serves as a first transmission end; similarly, the second resistor string comprises a third resistor and a sixth resistor which are connected in series, one end of the third resistor is connected with the first output end of the first optical coupler, one end of the sixth resistor is connected with the first input end of the second optical coupler, and the connection point of the third resistor and the sixth resistor serves as a second transmission end; the first output end of the second optocoupler is connected with a first power supply through a fifth resistor, and the first output end of the first optocoupler is connected with a second power supply through a second resistor; the other ends of the optical coupler are respectively connected with respective ground ends.
3. A two-way isolation circuit based on IIC protocol, its characterized in that: the IIC protocol comprises serial data SDA and a serial clock SCL, and a third optocoupler used for realizing isolation and unidirectional communication is arranged in an isolation circuit of the serial clock SCL; in serial data line SDA buffer circuit, including fourth, fifth opto-coupler, the input of fifth opto-coupler is connected to the output of fourth opto-coupler, and the output of fifth opto-coupler is connected to the input of fourth opto-coupler, and two opto-couplers meet end to end and form the closed loop, and the input of fourth opto-coupler, fifth opto-coupler is as the signal end respectively for realize the isolation and the two-way communication of both sides circuit.
4. An analog quantity output circuit based on IIC protocol for DCS system is characterized in that: the bidirectional isolation circuit comprises a main control circuit and at least one transmission circuit, wherein each transmission circuit is respectively connected with the main control circuit, each transmission circuit comprises a photoelectric isolation circuit, a digital-to-analog conversion circuit and a voltage-current conversion circuit which are sequentially connected, the photoelectric isolation circuit is used for converting serial port data of the main control circuit into signals transmitted by an IIC protocol to realize isolation of the main control circuit from the digital-to-analog conversion circuit, and the photoelectric isolation circuit comprises the bidirectional isolation circuit as claimed in claim 3.
5. The IIC protocol-based analog quantity output circuit for the DCS of claim 4, wherein: the digital-to-analog conversion circuit comprises a digital-to-analog conversion chip and is used for converting the digital signals transmitted by the main control circuit into analog signals.
6. The IIC protocol-based analog quantity output circuit for the DCS of claim 4, wherein: the voltage-current conversion circuit comprises a voltage follower circuit and a current conversion circuit which are sequentially connected, wherein the voltage follower circuit comprises a follower circuit, the positive input end of the follower is connected with the output end of the digital-analog conversion circuit through a first resistor, and the negative input end and the output end of the follower are respectively connected with the current conversion circuit.
7. The IIC protocol-based analog quantity output circuit for the DCS of claim 6, wherein: the current conversion circuit comprises an N-type tube, a P-type tube and an amplifier; the control end of the P-type tube is connected with the output end of the amplifier, the input end of the P-type tube is connected with the negative input end of the amplifier and one end of the first resistor, and the output end of the P-type tube is connected with one end of the first capacitor and the output end of the voltage-current conversion circuit; the control end of the N-type tube is connected with the output end of the voltage follower, the output end of the N-type tube is connected with the negative input end of the follower and one end of the sixth resistor, and the input end of the N-type tube is connected with the positive input end of the amplifier and one end of the second resistor; the other end of the first capacitor and the other end of the sixth resistor are grounded; the other end of the first resistor and the other end of the second resistor are connected with the positive end of the power supply.
8. An isolated chip comprising the bidirectional isolation circuit of any of claims 1-2.
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| CN202022537757.8U CN214177294U (en) | 2020-11-05 | 2020-11-05 | Bidirectional isolation circuit, analog output circuit and chip |
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| CN202022537757.8U CN214177294U (en) | 2020-11-05 | 2020-11-05 | Bidirectional isolation circuit, analog output circuit and chip |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114938316A (en) * | 2022-05-20 | 2022-08-23 | 淮安威灵电机制造有限公司 | Isolated asynchronous communication circuit and method of household appliance and household appliance |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114938316A (en) * | 2022-05-20 | 2022-08-23 | 淮安威灵电机制造有限公司 | Isolated asynchronous communication circuit and method of household appliance and household appliance |
| CN114938316B (en) * | 2022-05-20 | 2023-09-22 | 淮安威灵电机制造有限公司 | Isolation asynchronous communication circuit and method of household appliance and household appliance |
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