CN114374308A - Switch power supply isolation remote acquisition circuit and design method thereof - Google Patents

Switch power supply isolation remote acquisition circuit and design method thereof Download PDF

Info

Publication number
CN114374308A
CN114374308A CN202111538040.8A CN202111538040A CN114374308A CN 114374308 A CN114374308 A CN 114374308A CN 202111538040 A CN202111538040 A CN 202111538040A CN 114374308 A CN114374308 A CN 114374308A
Authority
CN
China
Prior art keywords
resistor
circuit
power supply
isolation
capacitor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202111538040.8A
Other languages
Chinese (zh)
Other versions
CN114374308B (en
Inventor
张润东
李永洲
任续津
范浩泽
任元元
邹磊
王灿灿
冯清江
姚凯
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beijing Institute of Electronic System Engineering
Original Assignee
Beijing Institute of Electronic System Engineering
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beijing Institute of Electronic System Engineering filed Critical Beijing Institute of Electronic System Engineering
Priority to CN202111538040.8A priority Critical patent/CN114374308B/en
Publication of CN114374308A publication Critical patent/CN114374308A/en
Application granted granted Critical
Publication of CN114374308B publication Critical patent/CN114374308B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

The embodiment of the invention provides a switch power supply isolation remote acquisition circuit and a design method thereof, wherein the switch power supply isolation remote acquisition circuit comprises the following steps: the power supply PID circuit, the isolation circuit and the setting circuit are connected in sequence; the setting circuit includes: the resistor R4, the resistor R5, the resistor R6, the resistor R7, the resistor R8 and the resistor R9 which are sequentially connected in series are respectively connected with the resistor R7 in parallel; the resistor R11 is connected at the connection point of the resistor R6 and the resistor R7; the output positive end of the load is connected with the positive end of the setting circuit, and the output negative end of the load is connected with the negative end of the setting circuit. The invention designs a switch power supply remote acquisition circuit, which can ensure that the voltage value of the input voltage VP of an isolation amplifier relative to V.S-is as follows: VP is VIN (R7// R8// R9)/(R4+ R5+ R6+ R7// R8// R9), the voltage value of VP is irrelevant to the voltage drop on the output lead of the switching power supply, the voltage value of the sampling end sampling voltage after passing through the signal setting circuit can truly reflect the output voltage change of the load, the load end voltage can be acquired without distortion, and the dynamic performance of the power supply is improved.

Description

Switch power supply isolation remote acquisition circuit and design method thereof
Technical Field
The invention relates to the technical field of power electronics, in particular to a switch power supply isolation remote acquisition circuit and a design method thereof.
Background
In some application occasions, the distance between the switching power supply and the electric equipment is long, the length of the lead is long, and the lead resistor R is connected with the switch power supplyConducting wireIt is great, can produce great voltage drop on the wire between power and the load when load operating current is great, lead to the supply voltage of load end to descend too much and can not satisfy the operational requirement, at this moment, need raise switching power supply's output voltage just can satisfy the power supply demand of load end, nevertheless load operating current diminishes the back, and the input voltage of load end becomes high probably to influence load work, just needs to use switching power supply's far adopting function under this kind of condition: and adjusting the output voltage of the power supply according to the output current change in real time to ensure the output voltage of the load to be stable. The remote sampling function of the switching power supply is a basic function of the switching power supply, and in the prior art, a voltage value at a load end is sampled, and a voltage signal is transmitted to a PID control circuit after voltage division, so that the switching power supply is controlled to lift a local output voltage, and the line voltage drop on a positive output bus and a negative output bus is compensated, as shown in fig. 1. This technique is difficult to cope with voltage fluctuations caused by sudden load changes occurring in the power supply long-run state. The theoretical maximum compensation voltage of the technical scheme can reach the power supply voltage of the differential amplification circuit.
Referring to fig. 2, the closest switch power supply remote sampling circuit of the invention, V.S + is sampling input positive, V.S-is sampling input negative; r1, R2, L1 and L2 are equivalent resistance and inductance of an output positive line and an output negative line, GND is a power supply control ground, V + is a power supply positive line of a power supply control circuit, and output and GND need to be short-circuited with a control ground when the circuit works. The circuit works in the following modes: the switching power supply samples the voltage of a load terminal through a far sampling line, the voltage is divided to form a voltage VP, a VP voltage signal enters a differential amplification circuit to generate a single-ended voltage signal vo.PID which is grounded with GND, and a PID regulation loop of the switching power supply regulates according to the voltage signal vo.PID so as to regulate the output voltage of the switching power supply. When the circuit works under the working condition of 'long distance (more than 100 meters) and long distance collection with compensation voltage more than 20V', the voltage drop on the output load lines R1 and R2 both exceed 10V, at the moment, the voltage value of VP relative to the control Ground (GND) is VP 2 Io + Vo R4/(R3+ R4), at the moment, the voltage amplitude of a VP signal is far beyond the supply voltage V + (12V) of the differential amplification circuit, the differential amplification circuit cannot normally work, and the far-exceeding function of the switching power supply fails.
The theoretical maximum compensation voltage of the technical scheme can reach the power supply voltage (V +) -0.7V of the differential amplification circuit, and the actually used far-end compensation voltage usually does not exceed 5V. The dynamic characteristics of the circuit are poor: when the load current Io is switched from full load to no load, due to the existence of equivalent inductance of the length of an output cable, the theoretical value of the equivalent inductance of the cable is larger than 0.1uH for 100 m cable output, a very high voltage peak can be generated at a load end during load switching, and the voltage peak and harmonic thereof can be conducted to a differential amplification circuit through a sampling line, so that the normal work of a power supply is influenced. When the length of the power output line reaches hundreds of meters, the equivalent inductance of the power output line is very large, and when the load current has large dynamics, the inductance can generate a very large voltage spike which can be conducted to a control ground GND through a remote mining line, so that the normal work and the dynamic characteristics of the power supply are influenced. In addition, no matter the output line and the sampling line are led out, interference signals of different frequency bands can be led in, and the normal work of the power supply can be influenced. The existing scheme is only suitable for short sampling distance and small line compensation voltage. Once the length of the sampling line is lengthened or the compensation voltage is increased, high common-mode voltage interference is introduced to cause abnormal operation of the PID control loop.
Disclosure of Invention
In order to realize long-distance line compensation, the invention provides a switch power supply isolation remote acquisition circuit, the circuit scheme firstly carries out isolation processing on feedback voltage after sampling signal voltage division and then transmits the feedback voltage to a PID control loop, the influence of common-mode voltage and interference signals generated after a sampling line is lengthened and compensation voltage is enlarged on the control loop can be effectively reduced, the load end voltage can be acquired without distortion and compensated, and the dynamic characteristic of a power supply is improved. The compensation voltage can be increased to 30% of the output voltage, and the dynamic characteristic of the power supply under the remote working condition is improved. The specific technical scheme is as follows:
the invention provides a switch power supply isolation remote acquisition circuit, which comprises a power supply PID circuit, an isolation circuit and a setting circuit; the power supply PID circuit, the isolation circuit and the setting circuit are connected in sequence; the setting circuit includes: the resistor R4, the resistor R5, the resistor R6, the resistor R7, the resistor R8 and the resistor R9 which are sequentially connected in series are respectively connected with the resistor R7 in parallel; a resistor R11 is connected at the connection point of the resistor R6 and the resistor R7; the output positive end of the load is connected with the positive end of the setting circuit, and the output negative end of the load is connected with the negative end of the setting circuit; wherein:
the power supply PID circuit is used for regulating and controlling the output voltage of the switching power supply;
the signal setting circuit is used for carrying out signal processing on the output voltage sampled at the load end;
the signal isolation circuit is used for isolating the output signal of the signal setting circuit.
Further, the tuning circuit further includes: the resistor R3 and the capacitor C1 are connected in parallel, one end of the resistor R3 is connected with the resistor R4, the other end of the resistor R3 is connected with the output positive end of the setting circuit, and the output positive end of the load is connected to the connection point of the resistor R3 and the resistor R4;
further comprising: the resistor R10 and the capacitor C2 are connected in parallel, one end of the resistor R10 is connected with the resistor R7, the other end of the resistor R10 is connected with the output negative end of the setting circuit, and the output negative end of the load is connected to the connection point of the resistor R7 and the resistor R10.
Further, the isolation circuit includes: the isolation DC-DC power supply module N11, the isolation amplifier N1, the operational amplifier N2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, a capacitor C11, a capacitor C12, a capacitor C13, a resistor R12, a resistor R13, a resistor R14, a resistor R15 and a resistor R16; a pin 4 and a pin 3 of the isolation DC-DC power supply module N11 are connected with a capacitor C12, and a capacitor C13 is connected between a pin 1 and a pin 2 of the isolation DC-DC power supply module N11; a capacitor C6 is connected between a pin 8 of an isolation amplifier N1 and a pin 2 of the isolation DC-DC power supply module N11, a pin 6 and a pin 7 of the isolation amplifier N1 are connected with a capacitor C7, a capacitor C8 and a capacitor C9 are connected in series with a pin 5 and a pin 6 of an operational amplifier N2, a resistor R14 is connected between the pin 6 and the pin 7 of the operational amplifier, a resistor R15 is connected with a pin 4 and a ground terminal of the operational amplifier, the capacitor C10 is connected in parallel with two ends of a resistor R15, the capacitor C11 is connected with the pin 8 and the ground terminal of the operational amplifier, one end of a resistor R12 is connected with the capacitor C7 and the other end of the resistor R8, one end of the resistor R13 is connected with the pin 6 of the isolation amplifier, and the other end of the resistor R13 is connected with the pin 5 of the operational amplifier.
Further, a resistor R16 is connected between the power supply PID circuit and the pin 7 of the operational amplifier.
Furthermore, the isolation amplifier adopts isolation power supply, and the input power ground of the isolation amplifier is connected with the output negative terminal of the load and is connected with the pin 3 of the isolation DC-DC power supply module N11.
A second aspect of the invention provides an electronic device comprising any one of the above switching power supply isolated remote sensing circuits.
The third aspect of the invention provides a design method of a switch power supply isolation remote acquisition circuit, which comprises the following steps:
designing a power supply PID circuit, an isolation circuit and a setting circuit which are connected in sequence; the power supply PID circuit, the isolation circuit and the setting circuit; the power supply PID circuit is used for regulating and controlling the output voltage of the switching power supply; the signal setting circuit is used for carrying out signal processing on the output voltage sampled at the load end; the signal isolation circuit is used for carrying out signal isolation on an output signal of the signal setting circuit;
designing a setting circuit, wherein the setting circuit comprises:
the resistor R4, the resistor R5, the resistor R6, the resistor R7, the resistor R8 and the resistor R9 which are sequentially connected in series are respectively connected with the resistor R7 in parallel; a resistor R11 is connected at the connection point of the resistor R6 and the resistor R7; the output positive end of the load is connected with the positive end of the setting circuit, and the output negative end of the load is connected with the negative end of the setting circuit.
Further, the setting circuit is further designed with:
the resistor R3 and the capacitor C1 are connected in parallel, one end of the resistor R3 is connected with the resistor R4, the other end of the resistor R3 is connected with the positive end of the setting circuit, and the output positive end of the load is connected to the connection point of the resistor R3 and the resistor R4;
further comprising: and the resistor R10 and the capacitor C2 are connected in parallel, one end of the resistor R10 is connected with the resistor R7, the other end of the resistor R10 is connected with the negative end of the setting circuit, and the output negative end of the load is connected with the connection point of the resistor R7 and the resistor R10.
The invention has the following beneficial effects:
the embodiment of the invention provides a switch power supply isolation remote acquisition circuit, which comprises: a power supply PID circuit, an isolation circuit and a setting circuit; the power supply PID circuit, the isolation circuit and the setting circuit are connected in sequence; the setting circuit includes: the resistor R4, the resistor R5, the resistor R6, the resistor R7, the resistor R8 and the resistor R9 which are sequentially connected in series are respectively connected with the resistor R7 in parallel; a resistor R11 is connected at the connection point of the resistor R6 and the resistor R7; the output positive end of the load is connected with the positive end of the setting circuit, and the output negative end of the load is connected with the negative end of the setting circuit. The switching power supply remote acquisition circuit designed by the invention can ensure that the voltage value of the input voltage VP of the isolation amplifier relative to V.S-is as follows:
and VP is VIN (R7// R8// R9)/(R4+ R5+ R6+ R7// R8// R9), the voltage value of VP is irrelevant to the voltage drop on the output lead of the switching power supply, namely the voltage value of the sampling end sampling voltage after passing through the signal setting circuit can truly reflect the change of the output voltage no matter what the voltage drop of the output lead of the switching power supply is. The influence of common-mode voltage and interference signals generated after the sampling line is lengthened and the compensation voltage is lengthened on a control loop can be effectively reduced, the voltage of the load end can be collected without distortion and compensated, and the dynamic performance of the power supply is improved.
Drawings
FIG. 1 is a schematic diagram of a remote function structure of a switching power supply;
FIG. 2 is a schematic diagram of a switch power supply remote acquisition function circuit in the prior art;
fig. 3 is a schematic structural block diagram of a switching power supply isolation remote acquisition circuit provided in embodiment 1 of the present invention;
fig. 4 is a schematic diagram of a preferred structure of a switching power supply isolation remote acquisition circuit provided in embodiment 1 of the present invention;
fig. 5 is a circuit schematic diagram of a setting circuit of a switching power supply isolation remote circuit according to embodiment 1 of the present invention;
fig. 6 is a circuit schematic diagram of an isolation circuit of a switching power supply isolation remote control circuit according to embodiment 1 of the present invention.
Detailed Description
Referring to fig. 3 to 4, fig. 3 is a schematic structural block diagram of a switching power supply isolation remote acquisition circuit provided in embodiment 1 of the present invention; fig. 4 is a schematic diagram of a preferred structure of a switching power supply isolation remote acquisition circuit provided in embodiment 1 of the present invention. The switch power supply isolation remote acquisition circuit comprises: a power supply PID circuit, an isolation circuit and a setting circuit; the power supply PID circuit, the isolation circuit and the setting circuit are connected in sequence; the setting circuit includes: the resistor R4, the resistor R5, the resistor R6, the resistor R7, the resistor R8 and the resistor R9 which are sequentially connected in series are respectively connected with the resistor R7 in parallel; a resistor R11 is connected at the connection point of the resistor R6 and the resistor R7; the output positive end of the load is connected with the positive end of the setting circuit, and the output negative end of the load is connected with the negative end of the setting circuit; wherein:
the power supply PID circuit is used for regulating and controlling the output voltage of the switching power supply;
the signal setting circuit is used for carrying out signal processing on the output voltage sampled at the load end;
the signal isolation circuit is used for isolating the output signal of the signal setting circuit.
The invention firstly isolates the feedback voltage after the sampling signal is divided and then transmits the feedback voltage to the control loop of the PID circuit of the power supply, the proposal can effectively reduce the influence of the common-mode voltage and the interference signal generated after the sampling line is lengthened and the compensation voltage is enlarged on the control loop, the voltage of the load end can be collected without distortion and compensated, and the dynamic performance of the power supply is improved.
V.S + is sample input positive, V.S-is sample input negative; r1, R2, L1 and L2 are equivalent resistance and inductance of output positive and negative lines, GND is a power supply control ground, V + is a power supply positive of a power supply control circuit, VCC + and V.S-are a group of power supplies isolated from the power supply control circuit, and the output ground of the circuit is isolated from the power supply control ground.
The switch power supply isolation remote acquisition circuit samples the voltage of a load terminal through a remote acquisition line, the voltage forms a voltage VP after signal setting, a VP voltage signal enters the signal isolation circuit to generate an isolation voltage feedback signal vo.
From the above fig. 4, it can be seen that the voltage value of the input voltage VP of the isolation amplifier N1 with respect to V.S —, VP is VIN (R7// R8// R9)/(R4+ R5+ R6+ R7// R8// R9), and the voltage value of VP is independent of the voltage drop on the output wire of the switching power supply, that is, the voltage value of the sampling voltage at the sampling end after passing through the signal setting circuit can truly reflect the change of the output voltage no matter what the voltage drop of the output wire of the switching power supply is.
When the circuit works under the working condition of 'long distance (more than 100 meters) and long extraction with compensation voltage more than 20V', the analysis is as follows:
the voltage drops on the output load lines R1 and R2 both exceed 10V, and at this time, the voltage value of VP, which is the voltage value V.S —, is VP ═ VIN (R7// R8// R9)/(R4+ R5+ R6+ R7// R8// R9). As long as the voltage obtained by dividing the voltage dividing resistor meets the working voltage of the isolation amplifier N1 during design.
The theoretical maximum compensation voltage of the technical scheme can reach more than 90% of the output voltage, and the general compensation voltage is controlled within 50% of the output voltage of the power supply in order to not influence the loop control of the switching power supply in practical application, namely the general compensation voltage of the power supply which nominally outputs 50V can reach 25V.
Dynamic characteristic analysis of the circuit: when the load current Io is switched from full load to no load, due to the existence of equivalent inductance of the length of an output cable, the theoretical value of equivalent inductance of the cable is larger than 0.1uH for 100 m cable output, a very high voltage peak can be generated at a load end during load switching, and the voltage peak and harmonic thereof can be conducted to the input end of an isolation amplifier through a sampling line.
In conclusion, the invention can solve the working condition that the switching power supply cannot normally work in the long distance (more than 100 meters) and the long distance with the compensation voltage more than 20V. Meanwhile, the dynamic characteristic of the power supply is effectively improved, and the temperature drift coefficient is reduced.
Referring to fig. 5, it is a circuit schematic diagram of a setting circuit of a switching power supply isolation remote circuit according to embodiment 1 of the present invention, where the setting circuit further includes: the resistor R3 and the capacitor C1 are connected in parallel, one end of the resistor R3 is connected with the resistor R4, the other end of the resistor R3 is connected with the positive end of the setting circuit, and the output positive end of the load is connected to the connection point of the resistor R3 and the resistor R4; further comprising: and the resistor R10 and the capacitor C2 are connected in parallel, one end of the resistor R10 is connected with the resistor R7, the other end of the resistor R10 is connected with the negative end of the setting circuit, and the output negative end of the load is connected with the connection point of the resistor R7 and the resistor R10. A first transmission line is connected between the output positive end of the load and the positive end of the setting circuit, and a second transmission line is connected between the output negative end of the load and the negative end of the setting circuit.
V.S + and V.S-are voltages at a load end, and in the figure, a resistor R3 and a capacitor C1 are arranged between V.S + and an output +, wherein R3 has the function of preventing positive line sampling of a sampling line from floating, and C1 forms a high-pass filter to provide a low-resistance channel for a high-frequency component on the output + line. The effects of R10 and C2 are the same as those of R3 and C1. The partial circuit can avoid the failure that the PID link of the power supply is out of control after the sampling line is suspended, and simultaneously, the highest voltage output by the power supply can be effectively limited due to the existence of R3 and R10 under the large dynamic working condition of the power supply. The low-resistance channel provided by the C1 and the C2 for the high-frequency signals can improve the dynamic characteristics of the power supply.
R4-R6 and R7-R9 are voltage dividing resistors for remotely sampling voltage, wherein the specification models of R4-R9 are completely the same, so that the temperature drift coefficient of the voltage VP after sampling and voltage dividing is extremely low by utilizing the characteristic that the temperature drift coefficients of the same devices are almost the same, and the temperature characteristic of the whole power supply system is effectively improved.
Referring to fig. 6, it is a schematic circuit diagram of an isolation circuit of a switching power supply isolation remote acquisition circuit according to embodiment 1 of the present invention, where the isolation circuit includes: the isolation DC-DC power supply module N11, the isolation amplifier N1, the operational amplifier N2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, a capacitor C11, a capacitor C12, a capacitor C13, a resistor R12, a resistor R13, a resistor R14, a resistor R15 and a resistor R16; a pin 4 and a pin 3 of the isolation DC-DC power supply module N11 are connected with a capacitor C12, and a capacitor C13 is connected between a pin 1 and a pin 2 of the isolation DC-DC power supply module N11; a capacitor C6 is connected between a pin 8 of an isolation amplifier N1 and a pin 2 of the isolation DC-DC power supply module N11, a pin 6 and a pin 7 of the isolation amplifier N1 are connected with a capacitor C7, a capacitor C8 and a capacitor C9 are connected in series with a pin 5 and a pin 6 of an operational amplifier N2, a resistor R14 is connected between the pin 6 and the pin 7 of the operational amplifier, a resistor R15 is connected with a pin 4 and a ground terminal of the operational amplifier, the capacitor C10 is connected in parallel with two ends of a resistor R15, the capacitor C11 is connected with the pin 8 and the ground terminal of the operational amplifier, one end of a resistor R12 is connected with the capacitor C7 and the other end of the resistor R8, one end of the resistor R13 is connected with the pin 6 of the isolation amplifier, and the other end of the resistor R13 is connected with the pin 5 of the operational amplifier. A resistor R16 is also connected between the power supply PID circuit and pin 7 of the operational amplifier. The isolation amplifier adopts isolation power supply, and the input voltage of the isolation amplifier is grounded with the output negative terminal of the load and grounded with a pin 3 of the isolation DC-DC power supply module N11.
In fig. 6, V + and GND supply power to the control circuit of the switching power supply, and VCC and V.S-supply voltage are common to the far-end sample. N11 is 1 isolated DC-DC power supply module converting 5V from 5V, and the isolation withstand voltage is larger than AC 1500V. C13 is an input high-frequency filter capacitor of the DC-DC module, C12 is an output high-frequency filter capacitor of the DC-DC module, and N1 is bypass capacitors of the isolation amplifier, C4, C5 and C6. C3 is a filter capacitor for inputting the signal VP, C7-C9 are high-frequency filter capacitors for inputting the differential amplifier circuit, and C10 and C11 are bypass capacitors for the operational amplifier N2. N2 is an operational amplifier.
The working principle is as follows: VP is the output voltage of the signal setting circuit, and enters the isolation amplifier N1 after high-frequency filtering, the output of N1 is the isolation differential signal OUTP, OUTN, the signal enters N2 after filtering and the peripheral circuit thereof form a differential amplifier, the output of the differential amplifier is a 0-2.5V single-ended signal, and the signal is used as the voltage feedback of the power PID circuit for regulation.
A second aspect of the invention provides an electronic device comprising any one of the above switching power supply isolated remote sensing circuits.
The third aspect of the invention provides a design method of a switch power supply isolation remote acquisition circuit, which comprises the following steps:
designing a power supply PID circuit, an isolation circuit and a setting circuit which are connected in sequence; the power supply PID circuit, the isolation circuit and the setting circuit; the power supply PID circuit is used for regulating and controlling the output voltage of the switching power supply; the signal setting circuit is used for carrying out signal processing on the output voltage sampled at the load end; the signal isolation circuit is used for carrying out signal isolation on an output signal of the signal setting circuit;
designing a setting circuit, wherein the setting circuit comprises:
the resistor R4, the resistor R5, the resistor R6, the resistor R7, the resistor R8 and the resistor R9 which are sequentially connected in series are respectively connected with the resistor R7 in parallel; a resistor R11 is connected at the connection point of the resistor R6 and the resistor R7; the output positive end of the load is connected with the positive end of the setting circuit, and the output negative end of the load is connected with the negative end of the setting circuit.
Further, the setting circuit is further designed with:
the resistor R3 and the capacitor C1 are connected in parallel, one end of the resistor R3 is connected with the resistor R4, the other end of the resistor R3 is connected with the input positive end of the setting circuit, and the output positive end of the load is connected to the connection point of the resistor R3 and the resistor R4;
further comprising: the resistor R10 and the capacitor C2 are connected in parallel, one end of the resistor R10 is connected with the resistor R7, the other end of the resistor R10 is connected with the output negative end of the setting circuit, and the output negative end of the load is connected to the connection point of the resistor R7 and the resistor R10.

Claims (10)

1. A switch power supply isolation remote acquisition circuit is characterized by comprising a power supply PID circuit, an isolation circuit and a setting circuit; the power supply PID circuit, the isolation circuit and the setting circuit are connected in sequence; the setting circuit includes: the resistor R4, the resistor R5, the resistor R6, the resistor R7, the resistor R8 and the resistor R9 which are sequentially connected in series are respectively connected with the resistor R7 in parallel; a resistor R11 is connected at the connection point of the resistor R6 and the resistor R7; the output positive end of the load is connected with the positive end of the setting circuit, and the output negative end of the load is connected with the negative end of the setting circuit; wherein:
the power supply PID circuit is used for regulating and controlling the output voltage of the switching power supply;
the signal setting circuit is used for carrying out signal processing on the output voltage sampled at the load end;
the signal isolation circuit is used for isolating the output signal of the signal setting circuit.
2. The isolated remote sampling circuit of the switching power supply according to claim 1, wherein the setting circuit further comprises: the resistor R3 and the capacitor C1 are connected in parallel, one end of the resistor R3 is connected with the resistor R4, the other end of the resistor R3 is connected with the positive end of the setting circuit, and the output positive end of the load is connected to the connection point of the resistor R3 and the resistor R4;
further comprising: and the resistor R10 and the capacitor C2 are connected in parallel, one end of the resistor R10 is connected with the resistor R7, the other end of the resistor R10 is connected with the negative end of the setting circuit, and the output negative end of the load is connected with the connection point of the resistor R7 and the resistor R10.
3. The isolated remote sampling circuit of the switching power supply according to claim 1, wherein a first transmission line is connected between the positive output terminal of the load and the positive terminal of the setting circuit, and a second transmission line is connected between the negative output terminal of the load and the negative terminal of the setting circuit.
4. The isolated remote sampling circuit of claim 1, wherein the isolation circuit comprises: the isolation DC-DC power supply module N11, the isolation amplifier N1, the operational amplifier N2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, a capacitor C11, a capacitor C12, a capacitor C13, a resistor R12, a resistor R13, a resistor R14, a resistor R15 and a resistor R16; a pin 4 and a pin 3 of the isolation DC-DC power supply module N11 are connected with a capacitor C12, and a capacitor C13 is connected between a pin 1 and a pin 2 of the isolation DC-DC power supply module N11; a capacitor C6 is connected between a pin 8 of an isolation amplifier N1 and a pin 2 of the isolation DC-DC power supply module N11, a pin 6 and a pin 7 of the isolation amplifier N1 are connected with a capacitor C7, a capacitor C8 and a capacitor C9 are connected in series with a pin 5 and a pin 6 of an operational amplifier N2, a resistor R14 is connected between the pin 6 and the pin 7 of the operational amplifier, a resistor R15 is connected with a pin 4 and a ground terminal of the operational amplifier, the capacitor C10 is connected in parallel with two ends of a resistor R15, the capacitor C11 is connected with the pin 8 and the ground terminal of the operational amplifier, one end of a resistor R12 is connected with the capacitor C7 and the other end of the resistor R8, one end of the resistor R13 is connected with the pin 6 of the isolation amplifier, and the other end of the resistor R13 is connected with the pin 5 of the operational amplifier.
5. The isolated remote sampling circuit of claim 4, wherein a resistor R16 is connected between the power supply PID circuit and the pin 7 of the operational amplifier.
6. The isolated remote circuit of claim 4, wherein the isolation amplifier is powered by isolation, and the input voltage of the isolation amplifier is connected to the negative output terminal of the load and to pin 3 of the isolated DC-DC power supply module N11.
7. An electronic device comprising the switching power supply isolation remote acquisition circuit of any one of claims 1-6.
8. A design method of a switch power supply isolation remote acquisition circuit is characterized by comprising the following steps:
designing a power supply PID circuit, an isolation circuit and a setting circuit which are connected in sequence; the power supply PID circuit, the isolation circuit and the setting circuit; the power supply PID circuit is used for regulating and controlling the output voltage of the switching power supply; the signal setting circuit is used for carrying out signal processing on the output voltage sampled at the load end; the signal isolation circuit is used for carrying out signal isolation on an output signal of the signal setting circuit;
designing a setting circuit, wherein the setting circuit comprises:
the resistor R4, the resistor R5, the resistor R6, the resistor R7, the resistor R8 and the resistor R9 which are sequentially connected in series are respectively connected with the resistor R7 in parallel; a resistor R11 is connected at the connection point of the resistor R6 and the resistor R7; the output positive end of the load is connected with the positive end of the setting circuit, and the output negative end of the load is connected with the negative end of the setting circuit.
9. The design method of the switch power supply isolation remote acquisition circuit according to claim 8, wherein the setting circuit is further designed with:
the resistor R3 and the capacitor C1 are connected in parallel, one end of the resistor R3 is connected with the resistor R4, the other end of the resistor R3 is connected with the output positive end of the setting circuit, and the output positive end of the load is connected to the connection point of the resistor R3 and the resistor R4;
further comprising: the resistor R10 and the capacitor C2 are connected in parallel, one end of the resistor R10 is connected with the resistor R7, the other end of the resistor R10 is connected with the output negative end of the setting circuit, and the output negative end of the load is connected to the connection point of the resistor R7 and the resistor R10.
10. The design method of the switch power supply isolation remote acquisition circuit according to claim 8, wherein a first transmission line is connected between the positive output terminal of the load and the positive terminal of the setting circuit, and a second transmission line is connected between the negative output terminal of the load and the negative terminal of the setting circuit.
CN202111538040.8A 2021-12-15 2021-12-15 Switch power supply isolation remote sampling circuit and design method thereof Active CN114374308B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111538040.8A CN114374308B (en) 2021-12-15 2021-12-15 Switch power supply isolation remote sampling circuit and design method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111538040.8A CN114374308B (en) 2021-12-15 2021-12-15 Switch power supply isolation remote sampling circuit and design method thereof

Publications (2)

Publication Number Publication Date
CN114374308A true CN114374308A (en) 2022-04-19
CN114374308B CN114374308B (en) 2024-06-04

Family

ID=81140041

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111538040.8A Active CN114374308B (en) 2021-12-15 2021-12-15 Switch power supply isolation remote sampling circuit and design method thereof

Country Status (1)

Country Link
CN (1) CN114374308B (en)

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201039004Y (en) * 2007-04-06 2008-03-19 北京嘉捷恒信能源技术有限责任公司 Separated dual closed remote sampling voltage stabilizing device for multi-switch power module
CN101741224A (en) * 2009-12-30 2010-06-16 北京东土科技股份有限公司 Voltage-drop compensation method for power output lines and switch power supply
CN202711109U (en) * 2012-06-07 2013-01-30 洛阳隆盛科技有限责任公司 Compensation circuit for remote-end voltage stabilization by using feedback loop
CN202904415U (en) * 2012-11-16 2013-04-24 徐州市恒源电器有限公司 Line loss self-compensating charging circuit
CN103605393A (en) * 2013-10-11 2014-02-26 北京航科发动机控制***科技有限公司 General closed-loop control system for providing positive and negative constant flow sources for aircraft engines
CN103795400A (en) * 2012-11-01 2014-05-14 北京航天拓扑高科技有限责任公司 High-precision sampling circuit based on VICOR module
CN105515553A (en) * 2015-12-29 2016-04-20 踪念品 Two-bus floating sampling data receiving circuit
CN105652079A (en) * 2016-02-29 2016-06-08 国网山东省电力公司青岛供电公司 Alternating-current sampling device
CN106093536A (en) * 2016-08-18 2016-11-09 中国电子科技集团公司第十四研究所 The remote sampling of a kind of closed loop system and adjustment system and method
CN205750610U (en) * 2016-03-15 2016-11-30 西安紫光国芯半导体有限公司 A kind of device reducing pressure drop
CN207283384U (en) * 2017-09-11 2018-04-27 深圳欧陆通电子股份有限公司 A kind of feedback regulation control circuit and Switching Power Supply
CN108304023A (en) * 2018-02-07 2018-07-20 北京航天发射技术研究所 A kind of Switching Power Supply high load stability compensation circuit
CN208873064U (en) * 2018-11-06 2019-05-17 武汉泓承科技有限公司 Overlength distance voltage regulation compensation circuit
CN212258805U (en) * 2020-06-22 2020-12-29 杭州士腾科技有限公司 Controller for frequency conversion of water pump
CN214176919U (en) * 2020-12-23 2021-09-10 艾普斯电源（苏州）有限公司 Current type voltage drop compensation control device and current type voltage drop compensation power supply system

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201039004Y (en) * 2007-04-06 2008-03-19 北京嘉捷恒信能源技术有限责任公司 Separated dual closed remote sampling voltage stabilizing device for multi-switch power module
CN101741224A (en) * 2009-12-30 2010-06-16 北京东土科技股份有限公司 Voltage-drop compensation method for power output lines and switch power supply
CN202711109U (en) * 2012-06-07 2013-01-30 洛阳隆盛科技有限责任公司 Compensation circuit for remote-end voltage stabilization by using feedback loop
CN103795400A (en) * 2012-11-01 2014-05-14 北京航天拓扑高科技有限责任公司 High-precision sampling circuit based on VICOR module
CN202904415U (en) * 2012-11-16 2013-04-24 徐州市恒源电器有限公司 Line loss self-compensating charging circuit
CN103605393A (en) * 2013-10-11 2014-02-26 北京航科发动机控制***科技有限公司 General closed-loop control system for providing positive and negative constant flow sources for aircraft engines
CN105515553A (en) * 2015-12-29 2016-04-20 踪念品 Two-bus floating sampling data receiving circuit
CN105652079A (en) * 2016-02-29 2016-06-08 国网山东省电力公司青岛供电公司 Alternating-current sampling device
CN205750610U (en) * 2016-03-15 2016-11-30 西安紫光国芯半导体有限公司 A kind of device reducing pressure drop
CN106093536A (en) * 2016-08-18 2016-11-09 中国电子科技集团公司第十四研究所 The remote sampling of a kind of closed loop system and adjustment system and method
CN207283384U (en) * 2017-09-11 2018-04-27 深圳欧陆通电子股份有限公司 A kind of feedback regulation control circuit and Switching Power Supply
CN108304023A (en) * 2018-02-07 2018-07-20 北京航天发射技术研究所 A kind of Switching Power Supply high load stability compensation circuit
CN208873064U (en) * 2018-11-06 2019-05-17 武汉泓承科技有限公司 Overlength distance voltage regulation compensation circuit
CN212258805U (en) * 2020-06-22 2020-12-29 杭州士腾科技有限公司 Controller for frequency conversion of water pump
CN214176919U (en) * 2020-12-23 2021-09-10 艾普斯电源（苏州）有限公司 Current type voltage drop compensation control device and current type voltage drop compensation power supply system

Also Published As

Publication number Publication date
CN114374308B (en) 2024-06-04

Similar Documents

Publication Publication Date Title
CN104020346A (en) Micro-current signal extraction system
CN109541277A (en) Full isolated DC voltage sample system and its working method
CN202330520U (en) High-voltage isolation sampling circuit
CN114374308A (en) Switch power supply isolation remote acquisition circuit and design method thereof
CN209894959U (en) High-common-mode-interference-resistance small-signal isolation sampling conditioning circuit of electronic transformer
CN102780463A (en) High-voltage cascade device and high-voltage cascade method of linear amplifier
CN217469739U (en) Feedback circuit, switching power supply, and electronic device
CN100573398C (en) Be used to improve the device of power supply load regulation rate
CN205450154U (en) A device for test of common mode conducted disturbance noise immunity
CN202794293U (en) Busbar voltagebar voltage isolating and sampling circuit
CN111193424B (en) Circuit for aging direct-current passive EMI filter
CN110277909B (en) Switched capacitor converter, current control circuit and current control method
CN114660367A (en) Voltage-sharing capacitor test circuit and method for high-voltage direct-current transmission converter valve assembly
CN106817095A (en) A kind of small-signal isolated amplifier with self-calibration function
CN208423352U (en) A kind of data line
CN107632191B (en) Current measuring circuit
CN107888193A (en) A kind of signal acquisition circuit and signal picker
CN206237304U (en) For the voltage-dropping type voltage conversion circuit of satellite anti-interference antenna
CN206673849U (en) The high-performance electric source module that nuclear power station reactor core Nuclear measurement system uses
CN219018679U (en) Output negative pressure sampling circuit in switching power supply
CN116505765B (en) Constant current circuit of BUCK power supply
CN205749885U (en) High frequency lasers echo-signal gain control for anti-collision system for automobile
CN101188383A (en) Power circuit
CN109861650A (en) The operational amplification circuit of adjustable reference voltage value
CN105785834B (en) Analog output card and analog output method

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant