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CN-115765479-B - Isolation chip

CN115765479BCN 115765479 BCN115765479 BCN 115765479BCN-115765479-B

Abstract

The invention discloses an isolation chip which comprises a power supply unit, an input unit and an output unit, wherein the power supply unit comprises an input power supply circuit and an output power supply circuit, the input power supply circuit and the output power supply circuit are respectively connected with the input unit and the output unit, the input unit comprises an amplifying circuit, an oscillating circuit, a chopper modulation circuit and a driving circuit, the amplifying circuit, the oscillating circuit and the driving circuit are all connected with the chopper modulation circuit, a first transformer group comprises a first transformer and a second transformer, the driving circuit and the oscillating circuit are respectively connected with primary coils of the first transformer and the second transformer, the output unit comprises a chopper demodulation circuit, an amplifying filter circuit, a logic control circuit and a plurality of conversion circuits, the input end of the chopper demodulation circuit is connected with secondary coils of the first transformer and the second transformer, the output end of the chopper demodulation circuit is sequentially connected with the amplifying filter circuit and the conversion circuits, the conversion circuits are connected in parallel, and the conversion circuits are all connected with the logic control circuit in series.

Inventors

  • WU XIAOBIN
  • ZHANG RUI
  • SUN JIN
  • YIN SHUANG
  • HU MING
  • LI DEBIN

Assignees

  • 绵阳市维博电子有限责任公司

Dates

Publication Date
20260512
Application Date
20221130

Claims (9)

  1. 1. An isolated chip, comprising: the power supply unit (30) is used for being connected with power supply equipment to supply power for the isolation chip; an input unit (10) for amplifying and modulating an input signal; an output unit (20) for demodulating and restoring the input signal, and performing signal conversion on the restored input signal to obtain an output signal; The power supply unit (30) comprises an input power supply circuit (31) and an output power supply circuit (32), wherein the input power supply circuit (31) is connected with the input unit (10), and the output power supply circuit (32) is connected with the output unit (20); The input unit (10) is connected with the output unit (20) through a first transformer group (40); the input unit (10) comprises an amplifying circuit (11), an oscillating circuit (13), a chopper modulation circuit (12) and a driving circuit (14); The amplifying circuit (11), the oscillating circuit (13) and the driving circuit (14) are all connected with the chopper modulation circuit (12); The first transformer group (40) comprises a first transformer (41) and a second transformer (42), the driving circuit (14) is connected with a primary coil of the first transformer (41), and the oscillating circuit (13) is connected with a primary coil of the second transformer (42).
  2. 2. An isolated chip according to claim 1, wherein the output unit (20) comprises a chopper demodulation circuit (21) and an amplification filter circuit (22); The input end of the chopper demodulation circuit (21) is connected with secondary coils of the first transformer (41) and the second transformer (42), and the output end of the chopper demodulation circuit (21) is connected with the amplifying filter circuit (22).
  3. 3. An isolated chip according to claim 2, wherein the output unit (20) further comprises a logic control circuit (23) and a plurality of switching circuits (24), The conversion circuits (24) are connected in parallel, the conversion circuits (24) are connected in series with the amplifying and filtering circuit (22), and the conversion circuits (24) are connected in series with the logic control circuit (23).
  4. 4. An isolation chip according to any one of claims 1-3, wherein the input terminals of the input power circuit (31) and the output power circuit (32) are both used for connecting to a power supply device.
  5. 5. An isolation chip according to any one of claims 1-3, wherein the input power circuit (31) is connected to the output power circuit (32) through a third transformer (33); the input end of the output power supply circuit (32) is used for being connected with power supply equipment.
  6. 6. An isolated chip according to claim 5, wherein the power supply unit (30) further comprises a PWM modulation circuit (34), an input of the PWM modulation circuit (34) being connected to an output of the output power supply circuit (32), an output of the PWM modulation circuit (34) being connected to a primary winding of a third transformer (33), a secondary winding of the third transformer (33) being connected to an input of the input power supply circuit (31).
  7. 7. An isolated chip according to claim 6, wherein the first transformer (41), the second transformer (42) and the third transformer (33) are planar transformers.
  8. 8. An isolated chip according to claim 2, characterized in that the chopper modulation circuit (12) is arranged 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. 9. An isolated chip according to claim 8, characterized in that a chopper demodulation circuit (21) is provided for phase demodulating the received high-frequency pulse signal.

Description

Isolation chip Technical Field The invention relates to an isolation amplifier, in particular to an isolation chip. Background At present, the common modulation mode of the main stream isolation chip at home and abroad is sigma-delta modulation, the temperature drift is higher, the power supply voltage of the main stream isolation chip is low, the power supply interval is narrow, if the power supply voltage is required to be increased, the power supply is required to be additionally arranged, the design difficulty and the purchase cost of the isolation chip are increased, and meanwhile, the product volume is also increased. Disclosure of Invention The invention aims to provide an isolation chip, which solves the problem of narrow power supply interval of the isolation chip. The invention is realized by the following technical scheme: an isolated chip, comprising: The power supply unit is used for being connected with power supply equipment to supply power for the isolation chip; an input unit for amplifying and modulating an input signal; The output unit is used for demodulating and restoring the input signal, and performing signal conversion on the restored input signal to obtain an output signal; The power supply unit comprises an input power supply circuit and an output power supply circuit, wherein the input power supply circuit is connected with the input unit, and the output power supply circuit is connected with the output unit. The input power supply circuit is connected with the input unit, and the output power supply circuit is connected with the output unit, so that the power supply interval of the isolation chip is widened, and the power supply requirement of an output list is met. Further, the input unit is connected with the output unit through a first transformer group; The input unit comprises an amplifying circuit, an oscillating circuit, a chopper modulation circuit and a driving circuit; The amplifying circuit, the oscillating circuit and the driving circuit are all connected with the chopper modulation circuit; the first transformer group comprises a first transformer and a second transformer, the driving circuit is connected with the primary side coil of the first transformer, and the oscillating circuit is connected with the primary side coil of the second transformer. The input unit is connected with the output unit through the first transformer group, the input unit amplifies and modulates the input signal, the input signal is sent to the output unit through the first transformer group, the output unit demodulates the received modulated signal, the input signal is restored, electric isolation between the input unit and the output unit is achieved, signal conversion is carried out on the restored input signal, an output signal corresponding to an output mode after conversion is obtained, and the problem that the output signal of the isolation chip is single is solved; the amplifying circuit is connected with the chopper modulation circuit, the amplifying circuit amplifies an input signal and transmits the amplified input signal to the chopper modulation circuit, the oscillating circuit is connected with the chopper modulation circuit, the oscillating circuit generates a clock signal and transmits the clock signal to the chopper modulation circuit, the chopper modulation circuit uses the clock signal to chopper modulate the amplified input signal, the input end of the driving circuit is connected with the output end of the chopper modulation circuit, the output end of the driving circuit is connected with the primary coil of the first transformer and loads the modulated input signal to the primary coil of the first transformer, the output end of the oscillating circuit is connected with the primary coil of the second transformer and loads the generated clock signal to the primary coil of the second transformer. Further, the output unit includes a chopper demodulation circuit and an amplifying filter circuit; the input end of the chopper demodulation circuit is connected with the secondary coils of the first transformer and the second transformer, and the output end of the chopper demodulation circuit is connected with the amplifying and filtering circuit. The first transformer and the second transformer transmit the modulated input signal from the primary coil to the secondary coil, one input end of the chopper demodulation circuit is connected with the secondary coil of the first transformer and transmits the input signal transmitted to the secondary coil of the first transformer to the chopper demodulation circuit, the other input end of the chopper demodulation circuit is connected with the secondary coil of the second transformer and transmits the clock signal transmitted to the secondary coil of the second transformer to the chopper demodulation circuit, the chopper demodulation circuit demodulates the modulated input signal by using the clock signal to obtain a demodulation signa