An isolated chip

Abstract

The application discloses an isolation chip, which comprises a power supply unit, an input unit and an output unit; the power supply unit comprises an input power supply circuit and an output power supply circuit, and the input power supply circuit and the output power supply circuit are connected with the input unit and the output unit respectively; the input unit comprises an amplification circuit, an oscillation circuit, a chopping modulation circuit and a driving circuit, and the amplification circuit, the oscillation circuit and the driving circuit are connected with the chopping modulation circuit; a first transformer set comprises a first transformer and a second transformer, and the driving circuit and the oscillation circuit are connected with primary side coils of the first transformer and the second transformer respectively; the output unit comprises a chopping demodulation circuit, an amplification filtering circuit, a logic control circuit and a plurality of conversion circuits, an input end of the chopping demodulation circuit is connected with secondary side coils of the first transformer and the second transformer, an output end of the chopping demodulation circuit is connected with the amplification filtering circuit and the conversion circuits in sequence, the conversion circuits are connected in parallel, and the conversion circuits are connected with the logic control circuit in series.

Description

Technical Field

[0001] This invention relates to isolation amplifiers, and more specifically to an isolation chip. Background Technology

[0002] Currently, the most common modulation method for mainstream isolation chips at home and abroad is Σ-Δ modulation, which has a high temperature drift. The supply voltage of mainstream isolation chips is low and the supply range is narrow. If the supply voltage is to be increased, an external power supply is required, which increases the design difficulty and procurement cost of isolation chips, as well as the product size. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to widen the power supply range of the isolation chip, and the purpose is to provide an isolation chip that solves the problem of narrow power supply range of the isolation chip.

[0004] This invention is achieved through the following technical solution:

[0005] An isolation chip, comprising:

[0006] A power supply unit is used to connect to a power supply device and supply power to the isolation chip;

[0007] The input unit is used to amplify and modulate the input signal;

[0008] The output unit is used to demodulate and restore the input signal, and to perform signal conversion on the restored input signal to obtain the output signal.

[0009] The aforementioned power supply unit includes an input power supply circuit and an output power supply circuit. The input power supply circuit is connected to the input unit, and the output power supply circuit is connected to the output unit.

[0010] The aforementioned input power supply circuit is connected to the input unit, and the aforementioned output power supply circuit is connected to the output unit, thereby widening the power supply range of the isolation chip to meet the power supply requirements of the output unit.

[0011] Furthermore, the aforementioned input unit is connected to the output unit via the first transformer group;

[0012] The aforementioned input unit includes an amplifier circuit, an oscillator circuit, a chopper modulation circuit, and a driver circuit;

[0013] The aforementioned amplifier circuit, oscillator circuit, and drive circuit are all connected to the chopper modulation circuit;

[0014] The aforementioned first transformer group includes a first transformer and a second transformer. The aforementioned drive circuit is connected to the primary coil of the first transformer, and the aforementioned oscillation circuit is connected to the primary coil of the second transformer.

[0015] The input unit and the output unit are connected through the first transformer group. The input unit amplifies and modulates the input signal and sends it to the output unit through the first transformer group. The output unit demodulates the received modulated signal and restores the input signal to achieve electrical isolation between the input unit and the output unit. Then, the restored input signal is converted to obtain the output signal corresponding to the output mode after conversion, which solves the problem of the isolation chip having a single output signal.

[0016] The aforementioned amplification circuit is connected to the chopper modulation circuit, which amplifies the input signal and transmits the amplified input signal to the chopper modulation circuit. The aforementioned oscillation circuit is also connected to the chopper modulation circuit, generating a clock signal and transmitting it to the chopper modulation circuit. The chopper modulation circuit uses the clock signal to chop and modulate the amplified input signal. The input terminal of the aforementioned drive circuit is connected to the output terminal of the chopper modulation circuit, and the output terminal of the drive circuit is connected to the primary winding of the first transformer, loading the modulated input signal onto the primary winding of the first transformer. The output terminal of the aforementioned oscillation circuit is connected to the primary winding of the second transformer, loading the generated clock signal onto the primary winding of the second transformer.

[0017] Furthermore, the aforementioned output unit includes a chopper demodulation circuit and an amplification and filtering circuit;

[0018] The input terminal of the aforementioned chopper demodulation circuit is connected to the secondary coils of the first and second transformers, and the output terminal of the aforementioned chopper demodulation circuit is connected to the amplification and filtering circuit.

[0019] The first and second transformers transmit the modulated input signal from the primary coil to the secondary coil. One input terminal of the chopper demodulation circuit is connected to the secondary coil of the first transformer, transmitting the input signal transmitted to the secondary coil to the chopper demodulation circuit. The other input terminal of the chopper demodulation circuit is connected to the secondary coil of the second transformer, transmitting the clock signal transmitted to the secondary coil to the chopper demodulation circuit. The chopper demodulation circuit uses the clock signal to demodulate the modulated input signal, obtaining a demodulated signal proportional to the input signal. The output terminal of the chopper demodulation circuit is connected to an amplification and filtering circuit, which amplifies the demodulated signal and filters it to restore the input signal.

[0020] Furthermore, the aforementioned output unit also includes logic control circuitry and multiple conversion circuits.

[0021] The aforementioned conversion circuits are connected in parallel, and all of the aforementioned conversion circuits are connected in series with the amplification and filtering circuits, and all of the aforementioned conversion circuits are connected in series with the logic control circuits.

[0022] The aforementioned conversion circuit is connected to the amplification and filtering circuit. The conversion circuit performs signal conversion on the restored input signal, converting the input signal into another output mode. Each conversion circuit corresponds to one output mode, solving the problem of the isolation chip having a single output. The aforementioned conversion circuit is connected to the logic control circuit. The logic control circuit selects the path of the conversion circuit, thereby determining the output mode of the isolation chip.

[0023] Furthermore, the input terminals of both the input power supply circuit and the output power supply circuit are used to connect to power supply equipment.

[0024] The input terminals of the above-mentioned input power supply circuit and output power supply circuit are each connected to a power supply device, thus employing dual power supply.

[0025] Furthermore, the aforementioned input power supply circuit is connected to the output power supply circuit via a third transformer;

[0026] The input terminal of the above-mentioned output power circuit is used to connect to the power supply equipment.

[0027] The input terminal of the aforementioned output power circuit is connected to the power supply equipment, and the output terminal of the output power circuit is connected to the output unit. The power supply equipment is processed by the output power circuit, and part of it is transmitted to the output unit to power the output unit. Part of it is transmitted to the input power circuit through the third transformer. The output terminal of the aforementioned input power circuit is connected to the input unit, and the part of the power supply is transmitted to the input unit to power the input unit.

[0028] Furthermore, the power supply unit also includes a PWM modulation circuit. The input terminal of the PWM modulation circuit is connected to the output terminal of the output power supply circuit, the output terminal of the PWM modulation circuit is connected to the primary winding of the third transformer, and the secondary winding of the third transformer is connected to the input terminal of the input power supply circuit.

[0029] The two output terminals of the aforementioned output power supply circuit are respectively connected to the output unit and the PWM modulation circuit. One output terminal supplies power to the output circuit, while the other output terminal modulates the power signal into a PWM signal via the PWM modulation circuit. The output terminal of the aforementioned PWM modulation circuit is connected to the primary winding of the third transformer, and the modulated PWM signal is applied to the primary winding of the third transformer. The third transformer then transmits the PWM signal from the primary winding to the secondary winding. The secondary winding of the aforementioned third transformer is connected to the input terminal of the aforementioned input power supply circuit, and the input terminal of the aforementioned input power supply circuit is connected to the input unit. After receiving the PWM signal, the aforementioned input power supply circuit processes it and supplies power to the input unit, thereby achieving the purpose of single-power-supply isolation.

[0030] Furthermore, the first transformer, the second transformer, and the third transformer mentioned above are all planar transformers.

[0031] The aforementioned planar transformer features high frequency, low profile, small height, and high operating frequency, which reduces the size of the isolation chip.

[0032] Furthermore, the aforementioned chopper modulation circuit is used to chopper modulate the input signal into a high-frequency pulse signal, the amplitude of which is proportional to the amplitude of the input signal.

[0033] The aforementioned chopper modulation circuit modulates the input signal into a high-frequency pulse signal. The high-frequency pulse signal is proportional to the input signal and has a small zero-point output, resulting in excellent temperature characteristics and solving the temperature drift problem of using ΔΣ modulation. The high-frequency pulse signal is transmitted through a planar transformer, which has high-frequency characteristics, thus avoiding distortion of the high-frequency pulse signal during transmission and improving signal transmission accuracy.

[0034] Furthermore, the chopper demodulation circuit is used to perform phase detection demodulation on the received high-frequency pulse signal, and the method is simple.

[0035] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0036] The aforementioned input power supply circuit is connected to the input unit, and the aforementioned output power supply circuit is connected to the output unit. Both the input unit and the output unit are connected to corresponding power supply circuits, which broadens the power supply range of the isolation chip to meet the power supply requirements of the output unit. Attached Figure Description

[0037] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings:

[0038] Figure 1 This is a connection block diagram of the dual-power supply isolation chip provided in Example 1;

[0039] Figure 2 This is a connection block diagram of the single-supply isolation chip provided in Example 2;

[0040] Figure 3 This is a connection block diagram of the power supply unit;

[0041] Figure 4 The connection block diagram for the input unit;

[0042] Figure 5 The connection block diagram for the output unit;

[0043] Figure 6This is a schematic diagram of the structure of the first transformer group.

[0044] The attached diagram shows the markings and corresponding component names:

[0045] 10-Input unit, 11-Amplifier circuit, 12-Chopper modulation circuit, 13-Oscillator circuit, 14-Driver circuit, 20-Output unit, 21-Chopper demodulation circuit, 22-Amplifier and filter circuit, 23-Logic control circuit, 24-Conversion circuit, 241-Bias conversion circuit, 242-Tracking circuit, 243-V / I conversion circuit, 30-Power supply unit, 31-Input power supply circuit, 32-Output power supply circuit, 33-Third transformer, 34-PWM modulation circuit, 35-Feedback circuit, 40-First transformer group, 41-First transformer, 42-Second transformer. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0047] Example 1

[0048] An isolation chip, such as Figure 1 , Figures 4-6 As shown, it includes:

[0049] Power supply unit 30 is used to connect to power supply equipment and supply power to the isolation chip;

[0050] Input unit 10 is used to amplify and modulate the input signal;

[0051] Output unit 20 is used to demodulate and restore the input signal, and to perform signal conversion on the restored input signal to obtain the output signal;

[0052] The power supply unit 30 includes an input power supply circuit 31 and an output power supply circuit 32. The input power supply circuit 31 is connected to the input unit 10, and the output power supply circuit 32 is connected to the output unit 20. The input terminals of both the input power supply circuit 31 and the output power supply circuit 32 are used to connect to power supply equipment.

[0053] Currently, the power supply range of the isolation chip is 3-5.5V, which cannot meet the power supply requirements of the voltage / current conversion circuit 24. An external power supply module is required during use, which increases the cost and size. The above-mentioned input power supply circuit 31 is connected to the input unit 10, and the above-mentioned output power supply circuit 32 is connected to the output unit 20. The input terminals of the above-mentioned input power supply circuit 31 and output power supply circuit 32 are respectively connected to a power supply device, adopting dual power supply. The power supply range of the isolation chip is 9-36V, which widens the power supply range of the isolation chip to meet the power supply requirements of the output unit 20.

[0054] In a specific embodiment, the input unit 10 is connected to the output unit 20 via the first transformer group 40;

[0055] The input unit 10 includes an amplifier circuit 11, an oscillation circuit 13, a chopper modulation circuit 12, and a drive circuit 14.

[0056] The aforementioned amplifier circuit 11, oscillator circuit 13, and drive circuit 14 are all connected to the chopper modulation circuit 12;

[0057] The first transformer group 40 mentioned above includes a first transformer 41 and a second transformer 42. The driving circuit 14 is connected to the primary coil of the first transformer 41, and the oscillation circuit 13 is connected to the primary coil of the second transformer 42.

[0058] The input unit 10 and the output unit 20 are connected through the first transformer group 40. The input unit 10 amplifies and modulates the input signal and sends it to the output unit 20 through the first transformer group 40. The output unit 20 demodulates the received modulated signal and restores the input signal, thereby achieving electrical isolation between the input unit 10 and the output unit 20. Then, the restored input signal is converted to obtain the output signal corresponding to the converted output mode, which solves the problem of the isolation chip having a single output signal.

[0059] The aforementioned amplifier circuit 11 is connected to the chopper modulation circuit 12. The amplifier circuit 11 amplifies the input signal and transmits the amplified input signal to the chopper modulation circuit 12. The aforementioned oscillation circuit 13 is connected to the chopper modulation circuit 12. The oscillation circuit 13 generates a 50kHz clock signal and transmits the clock signal to the chopper modulation circuit 12. The chopper modulation circuit 12 uses the clock signal to chop and modulate the amplified input signal. The input terminal of the aforementioned drive circuit 14 is connected to the output terminal of the chopper modulation circuit 12. The output terminal of the drive circuit 14 is connected to the primary winding of the first transformer 41, and the modulated input signal is loaded onto the primary winding of the first transformer 41. The output terminal of the aforementioned oscillation circuit 13 is connected to the primary winding of the second transformer 42, and the generated clock signal is loaded onto the primary winding of the second transformer 42.

[0060] In a specific embodiment, the output unit 20 includes a chopper demodulation circuit 21 and an amplification and filtering circuit 22;

[0061] The input terminal of the aforementioned chopper demodulation circuit 21 is connected to the secondary coils of the first transformer 41 and the second transformer 42, and the output terminal of the aforementioned chopper demodulation circuit 21 is connected to the amplification and filtering circuit 22.

[0062] The first transformer 41 and the second transformer 42 transmit the modulated input signal from the primary coil to the secondary coil. One input terminal of the chopper demodulation circuit 21 is connected to the secondary coil of the first transformer 41, transmitting the input signal transmitted to the secondary coil of the first transformer 41 to the chopper demodulation circuit 21. The other input terminal of the chopper demodulation circuit 21 is connected to the secondary coil of the second transformer 42, transmitting the clock signal transmitted to the secondary coil of the second transformer 42 to the chopper demodulation circuit 21. The chopper demodulation circuit 21 uses the clock signal to demodulate the modulated input signal, obtaining a demodulated signal proportional to the input signal. The output terminal of the chopper demodulation circuit 21 is connected to the amplification and filtering circuit 22, which amplifies the demodulated signal and filters it to restore the input signal.

[0063] In a specific embodiment, the output unit 20 further includes a logic control circuit 23 and multiple conversion circuits 24.

[0064] The aforementioned conversion circuits 24 are connected in parallel, and each of the aforementioned conversion circuits 24 is connected in series with the amplification and filtering circuit 22, and each of the aforementioned conversion circuits 24 is connected in series with the logic control circuit 23.

[0065] Currently, the output of the isolation chip is a voltage signal. If a current signal is to be output, an external voltage / current conversion circuit (i.e., V / I conversion circuit 243) is required, which increases the size and cost of the product.

[0066] The aforementioned conversion circuit 24 includes various conversion circuits such as voltage / current conversion circuit, tracking circuit 242, and bias conversion circuit 241. Under the control of the logic control circuit 23, it performs output conversion on the input signal, converting it into a V / I conversion output of 12mA±8mA or 4-20mA, a tracking output of ±5V or ±10V, and a bias output of 2.5V±2.5V or 5V±5V.

[0067] The aforementioned conversion circuit 24 is connected to the amplification and filtering circuit 22. The aforementioned conversion circuit 24 performs signal conversion on the restored input signal, converting the input signal into another output mode. Each conversion circuit 24 corresponds to one output mode, solving the problem of the isolation chip having a single output. The aforementioned conversion circuit 24 is connected to the logic control circuit 23. The logic control circuit 23 selects the path of the conversion circuit 24, thereby determining the output mode of the isolation chip.

[0068] In a specific embodiment, both the first transformer 41 and the second transformer 42 are planar transformers.

[0069] The aforementioned planar transformer features high frequency, low profile, small height, and high operating frequency, which reduces the size of the isolation chip.

[0070] In a specific embodiment, the chopper modulation circuit 12 is used to chopper modulate the input signal into a high-frequency pulse signal, and the amplitude of the high-frequency pulse signal is proportional to the amplitude of the input signal.

[0071] The aforementioned chopper modulation circuit 12 modulates the input signal into a high-frequency pulse signal. The high-frequency pulse signal is proportional to the input signal and has a small zero-point output, resulting in excellent temperature characteristics and solving the temperature drift problem of using ΔΣ modulation. The aforementioned high-frequency pulse signal is transmitted through a planar transformer, which has high-frequency characteristics, thus avoiding distortion of the high-frequency pulse signal during transmission and improving signal transmission accuracy.

[0072] In a specific embodiment, the chopper demodulation circuit 21 is used to perform phase detection demodulation on the received high-frequency pulse signal, and the method is simple.

[0073] Example 2

[0074] This embodiment 2 provides another isolation chip, such as Figures 2-6 As shown, it includes:

[0075] Power supply unit 30 is used to connect to power supply equipment and supply power to the isolation chip;

[0076] Input unit 10 is used to amplify and modulate the input signal;

[0077] Output unit 20 is used to demodulate and restore the input signal, and to perform signal conversion on the restored input signal to obtain the output signal;

[0078] The power supply unit 30 includes an input power supply circuit 31 and an output power supply circuit 32. The input power supply circuit 31 is connected to the input unit 10, and the output power supply circuit 32 is connected to the output unit 20. The input terminal of the output power supply circuit 32 is used to connect to the power supply equipment. The input power supply circuit 31 is connected to the output power supply circuit 32 through a third transformer 33.

[0079] The input unit 10 is connected to the output unit 20 through the first transformer group 40.

[0080] The input unit 10 and the output unit 20 are connected through the first transformer group 40. The input unit 10 amplifies and modulates the input signal and sends it to the output unit 20 through the first transformer group 40. The output unit 20 demodulates the received modulated signal and restores the input signal, thereby achieving electrical isolation between the input unit 10 and the output unit 20. Then, the restored input signal is converted to obtain the output signal corresponding to the converted output mode, which solves the problem of the isolation chip having a single output signal.

[0081] The input terminal of the aforementioned output power circuit 32 is connected to the power supply equipment, and the output terminal of the output power circuit 32 is connected to the output unit 20. The power supply equipment is processed by the output power circuit 32, and part of it is transmitted to the output unit 20 to power the output unit 20. The other part is transmitted to the input power circuit 31 through the third transformer 33. The output terminal of the aforementioned input power circuit 31 is connected to the input unit 10, and the power supply part is transmitted to the input unit 10 to power the input unit 10.

[0082] In a specific embodiment, the input unit 10 includes an amplifier circuit 11, an oscillation circuit 13, a chopper modulation circuit 12, and a driver circuit 14.

[0083] The aforementioned amplifier circuit 11, oscillator circuit 13, and drive circuit 14 are all connected to the chopper modulation circuit 12;

[0084] The first transformer group 40 mentioned above includes a first transformer 41 and a second transformer 42. The driving circuit 14 is connected to the primary coil of the first transformer 41, and the oscillation circuit 13 is connected to the primary coil of the second transformer 42.

[0085] The aforementioned amplifier circuit 11 is connected to the chopper modulation circuit 12. The amplifier circuit 11 amplifies the input signal and transmits the amplified input signal to the chopper modulation circuit 12. The aforementioned oscillation circuit 13 is connected to the chopper modulation circuit 12. The oscillation circuit 13 generates a clock signal and transmits the clock signal to the chopper modulation circuit 12. The chopper modulation circuit 12 uses the clock signal to chop and modulate the amplified input signal. The input terminal of the aforementioned drive circuit 14 is connected to the output terminal of the chopper modulation circuit 12. The output terminal of the drive circuit 14 is connected to the primary winding of the first transformer 41 and loads the modulated input signal onto the primary winding of the first transformer 41. The output terminal of the aforementioned oscillation circuit 13 is connected to the primary winding of the second transformer 42 and loads the generated clock signal onto the primary winding of the second transformer 42.

[0086] In a specific embodiment, the output unit 20 includes a chopper demodulation circuit 21 and an amplification and filtering circuit 22.

[0087] The input terminal of the aforementioned chopper demodulation circuit 21 is connected to the secondary coils of the first transformer 41 and the second transformer 42, and the output terminal of the aforementioned chopper demodulation circuit 21 is connected to the amplification and filtering circuit 22.

[0088] The first transformer 41 and the second transformer 42 transmit the modulated input signal from the primary coil to the secondary coil. One input terminal of the chopper demodulation circuit 21 is connected to the secondary coil of the first transformer 41, transmitting the input signal transmitted to the secondary coil of the first transformer 41 to the chopper demodulation circuit 21. The other input terminal of the chopper demodulation circuit 21 is connected to the secondary coil of the second transformer 42, transmitting the clock signal transmitted to the secondary coil of the second transformer 42 to the chopper demodulation circuit 21. The chopper demodulation circuit 21 uses the clock signal to demodulate the modulated input signal, obtaining a demodulated signal proportional to the input signal. The output terminal of the chopper demodulation circuit 21 is connected to the amplification and filtering circuit 22, which amplifies the demodulated signal and filters it to restore the input signal.

[0089] In a specific embodiment, the output unit 20 further includes a logic control circuit 23 and multiple conversion circuits 24.

[0090] The aforementioned conversion circuits 24 are connected in parallel, and each of the aforementioned conversion circuits 24 is connected in series with the amplification and filtering circuit 22, and each of the aforementioned conversion circuits 24 is connected in series with the logic control circuit 23.

[0091] The aforementioned conversion circuit 24 is connected to the amplification and filtering circuit 22. The aforementioned conversion circuit 24 performs signal conversion on the restored input signal, converting the input signal into another output mode. Each conversion circuit 24 corresponds to one output mode, solving the problem of the isolation chip having a single output. The aforementioned conversion circuit 24 is connected to the logic control circuit 23. The logic control circuit 23 selects the path of the conversion circuit 24, thereby determining the output mode of the isolation chip.

[0092] In a specific embodiment, the power supply unit 30 further includes a PWM modulation circuit 34. The input terminal of the PWM modulation circuit 34 is connected to the output terminal of the output power supply circuit 32, the output terminal of the PWM modulation circuit 34 is connected to the primary winding of the third transformer 33, and the secondary winding of the third transformer 33 is connected to the input terminal of the input power supply circuit 31.

[0093] The two output terminals of the aforementioned output power supply circuit 32 are respectively connected to the output unit 20 and the PWM modulation circuit 34. One output circuit supplies power to the output circuit, while the other output circuit modulates the power signal into a PWM signal via the PWM modulation circuit 34. The output terminal of the aforementioned PWM modulation circuit 34 is connected to the primary winding of the third transformer 33, and the modulated PWM signal is loaded onto the primary winding of the third transformer 33. The third transformer 33 then transmits the PWM signal from the primary winding to the secondary winding. The secondary winding of the aforementioned third transformer 33 is connected to the input terminal of the input power supply circuit 31, and the input terminal of the aforementioned input power supply circuit 31 is connected to the input unit 10. After receiving the PWM signal, the input power supply circuit 31 processes it and supplies power to the input unit 10, thereby achieving the purpose of single-power-supply isolation.

[0094] In a specific embodiment, the PWM modulation circuit 34 is connected to a feedback circuit 35, which is connected to the third transformer 33.

[0095] In a specific embodiment, the first transformer 41, the second transformer 42, and the third transformer 33 are all planar transformers.

[0096] In specific embodiments, all the circuits mentioned above use existing circuits.

[0097] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An isolated chip, characterized in that, include: Power supply unit (30) is used to connect to power supply equipment to supply power to the isolation chip; Input unit (10) is used to amplify and modulate the input signal; The output unit (20) is used to demodulate and restore the input signal, and to perform signal conversion on the restored input signal to obtain the output signal; The power supply unit (30) includes an input power supply circuit (31) and an output power supply circuit (32). The input power supply circuit (31) is connected to the input unit (10), and the output power supply circuit (32) is connected to the output unit (20). The input unit (10) is connected to the output unit (20) through the first transformer group (40); The input unit (10) includes an amplifier circuit (11), an oscillation circuit (13), a chopper modulation circuit (12), and a driver circuit (14). The amplifier circuit (11), oscillation circuit (13), and drive circuit (14) are all connected to the chopper modulation circuit (12); The first transformer group (40) includes a first transformer (41) and a second transformer (42). The driving circuit (14) is connected to the primary coil of the first transformer (41), and the oscillation circuit (13) is connected to the primary coil of the second transformer (42).

2. An isolation chip according to claim 1, characterized in that, The output unit (20) includes a chopper demodulation circuit (21) and an amplification and filtering circuit (22). The input terminal of the chopper demodulation circuit (21) is connected to the secondary coils of the first transformer (41) and the second transformer (42), and the output terminal of the chopper demodulation circuit (21) is connected to the amplification and filtering circuit (22).

3. An isolation chip according to claim 2, characterized in that, The output unit (20) also includes a logic control circuit (23) and multiple conversion circuits (24). The conversion circuits (24) are connected in parallel, and each of the conversion circuits (24) is connected in series with the amplification and filtering circuit (22). Each of the conversion circuits (24) is connected in series with the logic control circuit (23).

4. An isolation chip according to any one of claims 1 to 3, characterized in that, The input terminals of both the input power circuit (31) and the output power circuit (32) are used to connect to power supply equipment.

5. An isolation chip according to any one of claims 1 to 3, characterized in that, The input power circuit (31) is connected to the output power circuit (32) through the third transformer (33); The input terminal of the output power circuit (32) is used to connect to the power supply equipment.

6. An isolation chip according to claim 5, characterized in that, The power supply unit (30) further includes a PWM modulation circuit (34), the input terminal of which is connected to the output terminal of the output power supply circuit (32), the output terminal of which is connected to the primary coil of the third transformer (33), and the secondary coil of the third transformer (33) is connected to the input terminal of the input power supply circuit (31).

7. An isolation chip according to claim 6, characterized in that, The first transformer (41), the second transformer (42) and the third transformer (33) are all planar transformers.

8. An isolation chip according to claim 2, characterized in that, The chopper modulation circuit (12) is used to chopper modulate the input signal into a high-frequency pulse signal, the amplitude of which is proportional to the amplitude of the input signal.

9. An isolation chip according to claim 8, characterized in that, The chopper demodulation circuit (21) is used to perform phase detection demodulation on the received high-frequency pulse signal.

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