CN114374308B - Switch power supply isolation remote sampling circuit and design method thereof - Google Patents
Switch power supply isolation remote sampling circuit and design method thereof Download PDFInfo
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- CN114374308B CN114374308B CN202111538040.8A CN202111538040A CN114374308B CN 114374308 B CN114374308 B CN 114374308B CN 202111538040 A CN202111538040 A CN 202111538040A CN 114374308 B CN114374308 B CN 114374308B
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- 238000002955 isolation Methods 0.000 title claims abstract description 110
- 238000005070 sampling Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000003990 capacitor Substances 0.000 claims description 93
- 238000005065 mining Methods 0.000 claims description 17
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- 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
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- 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
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Abstract
The embodiment of the invention provides a switching power supply isolation remote acquisition circuit and a design method thereof, wherein the switching power supply isolation remote acquisition circuit comprises the following components: the power PID circuit, the isolation circuit and the setting circuit are connected in sequence; the setting circuit includes: the resistor R4, the resistor R5 and the resistor R6 are sequentially connected in series, and the resistor R7, the resistor R8 and the resistor R9 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 positive output end of the load is connected with the positive end of the setting circuit, and the negative output end of the load is connected with the negative end of the setting circuit. The design of the switching power supply far-sampling circuit can lead the voltage value of the input voltage VP of the isolation amplifier relative to V.S-to be as follows: VP=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 after the sampling voltage passes through the signal setting circuit can truly reflect the output voltage change of the load, the voltage of the load end can be acquired without distortion, and the dynamic characteristic of the power supply is improved.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a switching power supply isolation remote sampling circuit and a design method thereof.
Background
In some application occasions, the distance between the switch power supply and the electric equipment is far, the length of a wire is long, the resistance R Conducting wire of the wire is large, a relatively large voltage drop is generated on the wire between the power supply and the load when the working current of the load is large, so that the power supply voltage at the load end is reduced too much to meet the working requirement, at the moment, the output voltage of the switch power supply needs to be raised to meet the power supply requirement at the load end, however, after the working current of the load is reduced, the input voltage at the load end is increased to possibly influence the working of the load, and the remote acquisition function of the switch power supply needs to be used under the condition: and adjusting the output voltage of the power supply according to the change of the output current in real time to ensure the stability of the output voltage of the load. The remote sampling function of the switching power supply is a basic function of the switching power supply, and in the prior art, voltage signals are transmitted to a PID control circuit after voltage division by sampling the voltage value of a load end, so that the switching power supply is controlled to raise the local output voltage to compensate the line voltage drop on positive and negative output buses, as shown in figure 1. This technique has difficulty in coping with voltage fluctuations generated by abrupt load changes occurring in the power supply remote-off state. The theoretical maximum compensation voltage of the technical scheme can reach the supply voltage of the differential amplifying circuit.
Referring to fig. 2, the closest switching power supply far-sampling circuit of the invention, V.S + is the sampling input positive, V.S-is the sampling input negative; r1, R2, L1 and L2 are equivalent resistances and inductances of positive and negative lines, GND is power supply control ground, V+ is power supply control circuit, and output-ground GND needs short circuit when the circuit works. The working mode of the circuit is as follows: the switching power supply samples the voltage of a load end through a far sampling line, the voltage is divided to form a voltage VP, the VP voltage signal enters a differential amplifying circuit to generate a single-ended voltage signal vo.PID which is grounded with GND, and a PID regulating 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 that the extra-long distance (more than 100 meters) and the compensation voltage exceeds the far sampling voltage of more than 20V, the voltage drop on the output load lines R1 and R2 exceeds 10V, at the moment, the voltage value of VP relative to the control Ground (GND) is VP=R2×Io+vo×R4/(R3+R4), at the moment, the voltage amplitude of the VP signal is far beyond the power supply voltage V+ (12V) of the differential amplifying circuit, the differential amplifying circuit can not work normally, and the far-beyond function of the switching power supply is invalid.
The theoretical maximum compensation voltage of the technical scheme can reach the power supply voltage (V+) -0.7V of the differential amplifying circuit, and the actual use far-end compensation voltage is usually not more than 5V. The dynamic characteristics of the circuit are poor: when load current Io is switched from full load to no-load, the theoretical value of the equivalent inductance of the cable is larger than 0.1uH for 100 m cable output due to the existence of the equivalent inductance of the output cable, and a very high voltage peak is generated at a load end during load switching, and the voltage peak and the harmonic waves thereof are conducted to a differential amplifying circuit through a sampling line, so that the normal operation of a power supply is affected. When the power output line is hundreds of meters long, the equivalent inductance of the power output line is large, and when the load current is in large dynamic state, the inductance can generate a large voltage spike, and the voltage spike can be conducted to the control ground GND through the far mining line, so that the normal operation and dynamic characteristics of the power supply are affected. In addition, no matter the output line and the sampling line are led out, interference signals in different frequency bands can be led in, and the normal operation of the power supply can be influenced. The existing scheme is only suitable for the case that the sampling distance is short and the line compensation voltage is small. Once the sampling line length becomes longer or the compensation voltage becomes higher, very high common mode voltage interference is introduced, so that the PID control loop works abnormally.
Disclosure of Invention
In order to realize long-distance line compensation, the invention provides a switching power supply isolation remote sampling circuit, which is characterized in that the feedback voltage after sampling signal voltage division is firstly isolated and then transmitted to a PID control loop, so that the influence of common-mode voltage and interference signals generated after the sampling line is lengthened and the compensation voltage is enlarged on the control loop can be effectively reduced, the load end voltage can be acquired without distortion, the compensation is performed, and the dynamic characteristic of the 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 long-distance mining working condition is improved. The specific technical scheme is as follows:
The invention provides a switching power supply isolation remote sampling circuit which comprises a power supply PID circuit, an isolation circuit and a setting circuit, wherein the power supply PID circuit is connected with the isolation circuit; the power PID circuit, the isolation circuit and the setting circuit are connected in sequence; the setting circuit includes: the resistor R4, the resistor R5 and the resistor R6 are sequentially connected in series, and the resistor R7, the resistor R8 and the resistor R9 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 positive output end of the load is connected with the positive end of the setting circuit, and the negative output end of the load is connected with the negative end of the setting circuit; wherein:
The power PID circuit is used for regulating and controlling the output voltage of the switching power supply;
The signal setting circuit is used for performing signal processing on the output voltage sampled at the load end;
the signal isolation circuit is used for carrying out signal isolation on the output signal of the signal setting circuit.
Further, 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 output end of the setting circuit, and the positive output end of the load is connected at the connection point of the resistor R3 and the resistor R4;
Further comprises: and 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 at the connecting 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 and the operational amplifier N2, and the capacitor C3, the capacitor C4, the capacitor C5, the capacitor C6, the capacitor C7, the capacitor C8, the capacitor C9, the capacitor C11, the capacitor C12, the capacitor C13, the resistor R12, the resistor R13, the resistor R14, the resistor R15 and the resistor R16; the pin 4 and the pin 3 of the isolation DC-DC power supply module N11 are connected with a capacitor C12, and a capacitor C13 is connected between the pin 1 and the pin 2 of the isolation DC-DC power supply module N11; the capacitor C6 is connected between the pin 8 of the isolation amplifier N1 and the pin 2 of the isolation DC-DC power supply module N11, the capacitor C7 is connected between the pin 6 and the pin 7 of the isolation amplifier N1, the capacitor C8 and the capacitor C9 are connected on the pin 5 and the pin 6 of the operational amplifier N2 in series, the resistor R14 is connected between the pin 6 and the pin 7 of the operational amplifier, the resistor R15 is connected on the pin 4 and the grounding end of the operational amplifier, the capacitor C10 is connected at two ends of the resistor R15 in parallel, the capacitor C11 is connected on the pin 8 and the grounding end of the operational amplifier, one end of the resistor R12 is connected with the capacitor C7, the other end is connected with the capacitor C8, one end of the resistor R13 is connected with the pin 6 of the isolation amplifier, and the other end is connected with the pin 5 of the operational amplifier.
Further, a resistor R16 is also connected between the power PID circuit and the pin 7 of the operational amplifier.
Further, the isolation amplifier adopts isolation power supply, and the input power supply ground of the isolation amplifier is grounded together with the output negative terminal of the load and grounded together with the pin 3 of the isolation DC-DC power supply module N11.
A second aspect of the present invention provides an electronic device comprising a switching power supply isolated far-mining circuit as described in any of the above.
The third aspect of the invention provides a design method of a switching power supply isolated far-mining circuit, comprising the following steps:
Designing a power PID circuit, an isolation circuit and a setting circuit which are connected in sequence; the power PID circuit, the isolation circuit and the setting circuit; the power PID circuit is used for regulating and controlling the output voltage of the switching power supply; the signal setting circuit is used for performing signal processing on the output voltage sampled at the load end; the signal isolation circuit is used for carrying out signal isolation on the output signal of the signal setting circuit;
Designing a setting circuit, the setting circuit comprising:
The resistor R4, the resistor R5 and the resistor R6 are sequentially connected in series, and the resistor R7, the resistor R8 and the resistor R9 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 positive output end of the load is connected with the positive end of the setting circuit, and the negative output 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 at the connection point of the resistor R3 and the resistor R4;
Further comprises: and 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 connecting point of the resistor R7 and the resistor R10.
The beneficial effects of the invention are as follows:
The embodiment of the invention provides a switching power supply isolation remote sampling circuit, which comprises: a power PID circuit, an isolation circuit and a setting circuit; the power PID circuit, the isolation circuit and the setting circuit are connected in sequence; the setting circuit includes: the resistor R4, the resistor R5 and the resistor R6 are sequentially connected in series, and the resistor R7, the resistor R8 and the resistor R9 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 positive output end of the load is connected with the positive end of the setting circuit, and the negative output end of the load is connected with the negative end of the setting circuit. The switching power supply far sampling circuit designed by the invention can enable the voltage value of the input voltage VP of the isolation amplifier relative to V.S-to be as follows:
Vp=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 cable of the switching power supply, that is, the voltage value of the sampling end after the sampling voltage passes through the signal tuning circuit can truly reflect the change of the output voltage no matter what the voltage drop of the output cable of the switching power supply is. The method ensures that 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 can be effectively reduced, the load end voltage can be acquired without distortion, the compensation is performed, and the dynamic characteristic of the power supply is improved.
Drawings
FIG. 1 is a schematic diagram of a remote acquisition function of a switching power supply;
FIG. 2 is a schematic diagram of a circuit implementation structure of a remote acquisition function of a switching power supply in the prior art;
fig. 3 is a schematic diagram of a switch power supply isolated remote sampling circuit according to embodiment 1 of the present invention;
fig. 4 is a schematic diagram of a preferred structure of a switching power supply isolated far-mining circuit according to embodiment 1 of the present invention;
Fig. 5 is a circuit schematic diagram of a tuning circuit of a switching power supply isolated far-mining circuit provided in embodiment 1 of the present invention;
Fig. 6 is a schematic circuit diagram of an isolation circuit of a switching power supply isolation remote sampling circuit according to embodiment 1 of the present invention.
Detailed Description
Referring to fig. 3-4, fig. 3 is a schematic block diagram of a switching power supply isolated far-mining circuit according to embodiment 1 of the present invention; fig. 4 is a schematic diagram of a preferred structure of a switching power supply isolated far-mining circuit according to embodiment 1 of the present invention. The switching power supply isolation remote sampling circuit comprises: a power PID circuit, an isolation circuit and a setting circuit; the power PID circuit, the isolation circuit and the setting circuit are connected in sequence; the setting circuit includes: the resistor R4, the resistor R5 and the resistor R6 are sequentially connected in series, and the resistor R7, the resistor R8 and the resistor R9 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 positive output end of the load is connected with the positive end of the setting circuit, and the negative output end of the load is connected with the negative end of the setting circuit; wherein:
The power PID circuit is used for regulating and controlling the output voltage of the switching power supply;
The signal setting circuit is used for performing signal processing on the output voltage sampled at the load end;
the signal isolation circuit is used for carrying out signal isolation on the output signal of the signal setting circuit.
The invention firstly carries out isolation treatment on the feedback voltage after the sampling signal is divided and then transmits the feedback voltage to the control loop of the power PID circuit, the scheme 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, can collect the load end voltage without distortion, and compensates the load end voltage, thereby improving the dynamic performance of the power supply.
V.S + is positive and V.S-is negative; r1, R2, L1 and L2 are equivalent resistances and inductances of positive and negative output lines, GND is power supply control ground, V+ is 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.
According to the switch power supply isolation remote sampling circuit, the voltage of the load end is sampled through the remote sampling line, the voltage is subjected to signal setting to form the voltage VP, the VP voltage signal enters the signal isolation circuit to generate an isolation voltage feedback signal vo.PID, and the switch power supply PID regulating loop regulates according to the voltage signal vo.PID so as to regulate the output voltage of the switch power supply.
As can be seen from fig. 4, the voltage value of the input voltage VP of the isolation amplifier N1 relative to V.S-is vp=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 cable of the switching power supply, that is, the voltage value of the sampling voltage at the sampling end after passing through the signal conditioning circuit can truly reflect the change of the output voltage no matter what the voltage drop of the output cable of the switching power supply is.
The circuit is analyzed as follows when working under the working condition of 'far mining over an ultra-long distance (more than 100 meters) and the compensation voltage exceeding 20V':
The voltage drop on the output load lines R1 and R2 exceeds 10V, and the voltage value V.S' on VP is vp=vin (R7// r8// r9)/(r4+r5+r6+r7// R8// R9), which is independent of the line voltage drop, so that the switching power supply can work normally. The voltage obtained by the voltage dividing resistor is ensured to meet 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 not to influence the loop control of the switching power supply in practical application, namely, the general compensation voltage of the power supply with rated output of 50V can reach 25V.
Dynamic characteristics analysis of the circuit: when load current Io is switched from full load to no-load, the theoretical value of the equivalent inductance of the cable is larger than 0.1uH for 100 m cable output due to the existence of the equivalent inductance of the output cable, a very high voltage peak is generated at the load end during load switching, the voltage peak and the harmonic wave thereof can be conducted to the input end of the isolation amplifier through the sampling line, and the input voltage VP and the load end V.S-are commonly grounded and isolated from the control ground GND of the power supply by adopting the isolation amplifier N1 in the scheme of the circuit, so that the line interference can be greatly reduced only by designing a simple high-pass filter circuit such as the graph C3 aiming at the interference signal frequency band in the signal setting circuit or the isolation amplifying circuit.
In conclusion, the following conclusion can be drawn that the invention can solve the problem that the switching power supply cannot work normally under the working condition that the switching power supply cannot work for a long distance (more than 100 meters) and the compensation voltage exceeds 20V. Meanwhile, the dynamic characteristic of the power supply is effectively improved, and the temperature drift coefficient is reduced.
Referring to fig. 5, a circuit schematic diagram of a tuning circuit of a switching power supply isolated far-mining circuit provided in embodiment 1 of the present invention, where 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 positive end of the setting circuit, and the output positive end of the load is connected at the connection point of the resistor R3 and the resistor R4; further comprises: and 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 connecting 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, a resistor R3 and a capacitor C1 are arranged between V.S + and an output+ in the figure, wherein the R3 is used for preventing a sampling line from suspending in the air during positive line sampling, and C1 forms a high-pass filter for providing a low-resistance channel for high-frequency components on the output+ line. The functions of R10 and C2 are the same as those of R3 and C1. The circuit can avoid the out-of-control fault of the PID link of the power supply after the sampling line is suspended, and meanwhile, 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. Providing a low resistance channel for high frequency signals by C1 and C2 can improve the dynamic characteristics of the power supply.
R4-R6 and R7-R9 are voltage dividing resistors for far sampling voltage, wherein the specifications and the types of R4-R9 are completely the same, so that the temperature drift coefficient of the voltage VP after sampling voltage division can be 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, a schematic circuit diagram of an isolation circuit of a switching power supply isolation remote sampling circuit provided in embodiment 1 of the present invention, where the isolation circuit includes: the isolation DC-DC power supply module N11, the isolation amplifier N1 and the operational amplifier N2, and the capacitor C3, the capacitor C4, the capacitor C5, the capacitor C6, the capacitor C7, the capacitor C8, the capacitor C9, the capacitor C11, the capacitor C12, the capacitor C13, the resistor R12, the resistor R13, the resistor R14, the resistor R15 and the resistor R16; the pin 4 and the pin 3 of the isolation DC-DC power supply module N11 are connected with a capacitor C12, and a capacitor C13 is connected between the pin 1 and the pin 2 of the isolation DC-DC power supply module N11; the capacitor C6 is connected between the pin 8 of the isolation amplifier N1 and the pin 2 of the isolation DC-DC power supply module N11, the capacitor C7 is connected between the pin 6 and the pin 7 of the isolation amplifier N1, the capacitor C8 and the capacitor C9 are connected on the pin 5 and the pin 6 of the operational amplifier N2 in series, the resistor R14 is connected between the pin 6 and the pin 7 of the operational amplifier, the resistor R15 is connected on the pin 4 and the grounding end of the operational amplifier, the capacitor C10 is connected at two ends of the resistor R15 in parallel, the capacitor C11 is connected on the pin 8 and the grounding end of the operational amplifier, one end of the resistor R12 is connected with the capacitor C7, the other end is connected with the capacitor C8, one end of the resistor R13 is connected with the pin 6 of the isolation amplifier, and the other end is connected with the pin 5 of the operational amplifier. A resistor R16 is also connected between the power PID circuit and the pin 7 of the operational amplifier. The isolation amplifier adopts isolation power supply, and the input voltage of the isolation amplifier is grounded together with the output negative terminal of the load and grounded together with the pin 3 of the isolation DC-DC power supply module N11.
In fig. 6 v+, GND is the supply voltage for the control circuit of the switching power supply, VCC, V.S-is the supply voltage common to the remote samples. N11 is 1 isolation DC-DC power module of 5V to 5V, and isolation withstand voltage is greater than AC1500V. C13 is the input high-frequency filter capacitor of the DC-DC module, C12 is the output high-frequency filter capacitor of the DC-DC module, N1 is the bypass capacitor of the isolation amplifier, C4, C5 and C6. C3 is the filter capacitor of the input signal VP, C7-C9 is the high-frequency filter capacitor input by the differential amplifying circuit, and C10 and C11 are the bypass capacitors of the operational amplifier N2. N2 is an operational amplifier.
Working principle: VP is the output voltage of the signal setting circuit, the output of the signal setting circuit which is subjected to high-frequency filtering enters the isolation amplifier N1, the output of the signal setting circuit N1 is the isolation differential signals OUTP and OUTN, the signal is filtered and enters the N2 and the peripheral circuit thereof to form the differential amplifier, the differential amplifier outputs a single-ended signal with the voltage of 0-2.5V, and the signal is used as the voltage feedback of the power PID circuit for adjustment.
A second aspect of the present invention provides an electronic device comprising a switching power supply isolated far-mining circuit as described in any of the above.
The third aspect of the invention provides a design method of a switching power supply isolated far-mining circuit, comprising the following steps:
Designing a power PID circuit, an isolation circuit and a setting circuit which are connected in sequence; the power PID circuit, the isolation circuit and the setting circuit; the power PID circuit is used for regulating and controlling the output voltage of the switching power supply; the signal setting circuit is used for performing signal processing on the output voltage sampled at the load end; the signal isolation circuit is used for carrying out signal isolation on the output signal of the signal setting circuit;
Designing a setting circuit, the setting circuit comprising:
The resistor R4, the resistor R5 and the resistor R6 are sequentially connected in series, and the resistor R7, the resistor R8 and the resistor R9 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 positive output end of the load is connected with the positive end of the setting circuit, and the negative output 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 at the connection point of the resistor R3 and the resistor R4;
Further comprises: and 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 at the connecting point of the resistor R7 and the resistor R10.
Claims (8)
1. A switching power supply isolated far mining circuit, comprising: a power PID circuit, an isolation circuit and a setting circuit; the power PID circuit, the isolation circuit and the setting circuit are connected in sequence; the setting circuit includes: the resistor R4, the resistor R5 and the resistor R6 are sequentially connected in series, and the resistor R7, the resistor R8 and the resistor R9 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 positive output end of the load is connected with the positive end of the setting circuit, and the negative output end of the load is connected with the negative end of the setting circuit; wherein:
The power PID circuit is used for regulating and controlling the output voltage of the switching power supply;
the setting circuit is used for performing signal processing on the output voltage sampled at the load end;
the isolation circuit is used for carrying out signal isolation on the output signal of the signal setting circuit;
The isolation circuit includes: the isolation DC-DC power supply module N11, the isolation amplifier N1 and the operational amplifier N2, and the capacitor C3, the capacitor C4, the capacitor C5, the capacitor C6, the capacitor C7, the capacitor C8, the capacitor C9, the capacitor C11, the capacitor C12, the capacitor C13, the resistor R12, the resistor R13, the resistor R14, the resistor R15 and the resistor R16; the pin 4 and the pin 3 of the isolation DC-DC power supply module N11 are connected with a capacitor C12, and a capacitor C13 is connected between the pin 1 and the pin 2 of the isolation DC-DC power supply module N11; a capacitor C6 is connected between the pin 8 of the isolation amplifier N1 and the pin 2 of the isolation DC-DC power supply module N11, the pin 6 and the pin 7 of the isolation amplifier N1 are connected with a capacitor C7, the capacitor C8 and the capacitor C9 are connected on the pin 5 and the pin 6 of the operational amplifier N2 in series, a resistor R14 is connected between the pin 6 and the pin 7 of the operational amplifier, a resistor R15 is connected on the pin 4 and the grounding end of the operational amplifier, a capacitor C10 is connected at two ends of the resistor R15 in parallel, a capacitor C11 is connected on the pin 8 and the grounding end of the operational amplifier, one end of a resistor R12 is connected with the capacitor C7, the other end is connected with the capacitor C8, one end of a resistor R13 is connected with the pin 6 of the isolation amplifier, and the other end is connected with the pin 5 of the operational amplifier;
The isolation amplifier adopts isolation power supply, and the input voltage of the isolation amplifier is grounded together with the output negative terminal of the load and grounded together with the pin 3 of the isolation DC-DC power supply module N11.
2. The switching power supply isolated far-mining circuit of claim 1, wherein the tuning 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 at the connection point of the resistor R3 and the resistor R4;
Further comprises: and 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 connecting point of the resistor R7 and the resistor R10.
3. The isolated far-mining circuit of claim 1, wherein a first transmission line is connected between an output positive terminal of the load and a positive terminal of the tuning circuit, and a second transmission line is connected between an output negative terminal of the load and a negative terminal of the tuning circuit.
4. The isolated far-mining circuit of switching power supply according to claim 1, characterized in that a resistor R16 is also connected between the power supply PID circuit and the pin 7 of the operational amplifier.
5. An electronic device comprising the switching power supply isolated distance circuit of any of claims 1-4.
6. A design method of a switching power supply isolation remote sampling circuit is characterized by comprising the following steps:
designing a power PID circuit, an isolation circuit and a setting circuit which are connected in sequence; the power PID circuit, the isolation circuit and the setting circuit; the power PID circuit is used for regulating and controlling the output voltage of the switching power supply; the setting circuit is used for performing signal processing on the output voltage sampled at the load end; the isolation circuit is used for carrying out signal isolation on the output signal of the setting circuit;
Designing a setting circuit, the setting circuit comprising:
The resistor R4, the resistor R5 and the resistor R6 are sequentially connected in series, and the resistor R7, the resistor R8 and the resistor R9 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 positive output end of the load is connected with the positive end of the setting circuit, and the negative output end of the load is connected with the negative end of the setting circuit;
The isolation circuit includes: the isolation DC-DC power supply module N11, the isolation amplifier N1 and the operational amplifier N2, and the capacitor C3, the capacitor C4, the capacitor C5, the capacitor C6, the capacitor C7, the capacitor C8, the capacitor C9, the capacitor C11, the capacitor C12, the capacitor C13, the resistor R12, the resistor R13, the resistor R14, the resistor R15 and the resistor R16; the pin 4 and the pin 3 of the isolation DC-DC power supply module N11 are connected with a capacitor C12, and a capacitor C13 is connected between the pin 1 and the pin 2 of the isolation DC-DC power supply module N11; a capacitor C6 is connected between the pin 8 of the isolation amplifier N1 and the pin 2 of the isolation DC-DC power supply module N11, the pin 6 and the pin 7 of the isolation amplifier N1 are connected with a capacitor C7, the capacitor C8 and the capacitor C9 are connected on the pin 5 and the pin 6 of the operational amplifier N2 in series, a resistor R14 is connected between the pin 6 and the pin 7 of the operational amplifier, a resistor R15 is connected on the pin 4 and the grounding end of the operational amplifier, a capacitor C10 is connected at two ends of the resistor R15 in parallel, a capacitor C11 is connected on the pin 8 and the grounding end of the operational amplifier, one end of a resistor R12 is connected with the capacitor C7, the other end is connected with the capacitor C8, one end of a resistor R13 is connected with the pin 6 of the isolation amplifier, and the other end is connected with the pin 5 of the operational amplifier;
The isolation amplifier adopts isolation power supply, and the input voltage of the isolation amplifier is grounded together with the output negative terminal of the load and grounded together with the pin 3 of the isolation DC-DC power supply module N11.
7. The method for designing a switching power supply isolated far-mining circuit according to claim 6, 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 positive output end of the setting circuit, and the positive output end of the load is connected at the connection point of the resistor R3 and the resistor R4;
Further comprises: and 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 at the connecting point of the resistor R7 and the resistor R10.
8. The method of claim 6, wherein a first transmission line is connected between the positive output terminal of the load and the positive terminal of the tuning circuit, and a second transmission line is connected between the negative output terminal of the load and the negative terminal of the tuning circuit.
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| CN114374308A (en) | 2022-04-19 |
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