CN110544946A - Constant voltage power supply remote end power supply compensating system - Google Patents
Constant voltage power supply remote end power supply compensating system Download PDFInfo
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- CN110544946A CN110544946A CN201910922198.1A CN201910922198A CN110544946A CN 110544946 A CN110544946 A CN 110544946A CN 201910922198 A CN201910922198 A CN 201910922198A CN 110544946 A CN110544946 A CN 110544946A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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Abstract
The invention discloses a remote power supply compensation system of a regulated power supply, which comprises: the rectification filter circuit comprises single-phase bridge rectifier circuit and LC-pi filter circuit, single-phase bridge rectifier circuit includes: the power supply comprises a power transformer, a rectifier diode VD1, a rectifier diode VD2, a rectifier diode VD3, a rectifier diode VD4 and a load resistor RL; the rectifier diode VD1, the rectifier diode VD2, the rectifier diode VD3 and the rectifier diode VD4 form a rectifier bridge; the LC-pi filter circuit is formed by combining an inductor, a capacitor filter and an LC filter; the inductor group stops most alternating current components after alternating current rectification, and a small part of current passing through the inductor is subjected to double filtering by the capacitor filter and the LC filter to obtain smoother voltage. The voltage regulation signal is isolated from the stabilized voltage power supply by adopting the secondary isolation compensation module, so that the anti-interference performance of the whole power supply system is improved, the isolation of the analog signal is realized, and the anti-interference performance of the whole power supply system is improved.
Description
Technical Field
The invention relates to the technical field of power supply, in particular to a remote power supply compensation system of a voltage-stabilized power supply.
background
When the remote power supply, because load supply cable is longer, adjust power output voltage to the required magnitude of voltage of load, when the electric current transmits in the cable, appear the problem of two aspects easily: on one hand, the resistance on the cable is easy to cause voltage loss, so that the actual power supply voltage at a load end is reduced, and the power supply voltage cannot meet the power consumption of the load, and on the other hand, the anti-interference performance of a power supply system can cause the output voltage of the power supply to change repeatedly near a normal voltage value, so that the power supply output generates oscillation;
at present, the remote power supply technology in the market mainly designs and improves the voltage loss condition, and deep research is not carried out on the anti-interference performance of a power supply, and the invention patent of application No. 201611019077.9 is designed and researched mainly around the power supply voltage loss through a power supply remote feedback switching circuit, a power supply manual automatic switching circuit, a power supply compensation circuit, a voltage instruction adjusting circuit and a power supply instruction control circuit; in order to isolate a voltage regulation signal from a regulated power supply and improve the anti-interference performance of the whole power supply system, the prior art is urgently needed to be reformed based on the current technical situation.
Disclosure of Invention
the invention provides a remote power supply compensation system of a stabilized voltage power supply, which solves the problem that the power supply output oscillates due to the fact that the anti-interference performance of a power supply system can cause the repeated change of the power supply output voltage near a normal voltage value.
in some optional embodiments, to solve the above technical problem, the following technical solutions are adopted in the present invention:
a regulated power supply remote supply compensation system comprising:
The rectification filter circuit consists of a single-phase bridge rectifier circuit and an LC-pi filter circuit;
The single-phase bridge rectifier circuit includes: the power supply comprises a power transformer, a rectifier diode VD1, a rectifier diode VD2, a rectifier diode VD3, a rectifier diode VD4 and a load resistor RL; the rectifier diode VD1, the rectifier diode VD2, the rectifier diode VD3 and the rectifier diode VD4 form a rectifier bridge;
The LC-pi filter circuit is formed by combining an inductor, a capacitor filter and an LC filter;
after alternating current is rectified, most of alternating current components are stopped by the inductor, and a small part of alternating current components pass through the inductor and then are subjected to double filtering by the capacitor filter and the LC filter, so that the obtained voltage is smoother.
a primary voltage compensation circuit, comprising: the voltage stabilizing device comprises a voltage stabilizing resistor R, a voltage stabilizing triode VT, a load RL, a voltage dividing resistor R1, a voltage dividing resistor R2, a compensating resistor R3, a compensating resistor R4, a contactor, a relay, a backflow preventing diode VD1 and a voltage stabilizing diode VDZ;
the voltage dividing resistors R1 and R2 are resistors with a type selection kilohm level to realize power supply output voltage sampling;
the conduction end of the backflow prevention diode VD1 is electrically connected with a contactor, and the contactor realizes the control of load power supply and prevents current from flowing back;
the power supply receives a power supply instruction to close the contactor and the relay, the voltage of the load end is divided by voltage dividing resistors R1 and R2 and then is sent to the input end of the power supply, and the voltage is regulated by an external regulator to realize the output voltage stabilization of the power supply; the working time sequence that the power supply circuit is firstly connected with the compensation circuit and then connected with the load is realized, and the risk that the load device is damaged because the compensation circuit is firstly connected is avoided.
A secondary isolation compensation module comprising:
the multi-channel detection isolation unit comprises a multi-channel switch, a shift register, a communication isolation module 1 and a communication isolation module 2;
the multi-path detection isolation unit is used for detecting multi-path voltage signals, is provided with 3 single-ended 8-channel multi-path switches, detects 1 path at the same time by each single-ended single-channel multi-path switch, and is controlled by a shift register through a serial port to a parallel port; the communication isolation module 1 can read 3 paths of voltage signals at the same time, and can read all 24 paths of signals by controlling the communication isolation module 2 for 8 times, so that the most voltage can be read by the least pins.
the voltage comparison module comprises a comparator, a DC-DC voltage reduction module and an isolator;
the voltage signal provides power for the outside and provides a group of isolated square wave signals, the external power firstly provides power for the isolated comparator and then provides voltage for the isolated device through the DC-DC voltage reduction module, the generated voltage generates a reference voltage through voltage division for the comparator to use, the voltage signal output by the isolator is compared with the reference voltage and is generated from square wave signals with the same amplitude of the external voltage through the comparator, the finally output square wave signal is the real voltage transmitted to the load, and the voltage of the load can be compared and analyzed through the fluctuation condition of the square wave signal.
the high-voltage signal isolation unit comprises a displacement buffer and a high-voltage solid-state relay;
the displacement buffer is serially input and parallelly output in a serial port-to-parallel port mode;
each displacement buffer can realize 8-path output control, and after n displacement buffers are cascaded, 8-path signals can be controlled through 3 control lines;
A galvanic isolation module comprising: a high-speed DAC, a high-speed isolation operational amplifier and an isolation power supply;
the high-speed DAC adopts 12 data lines for communication, and can realize any wave;
the high-speed isolation operational amplifier is used for realizing isolation, and in order to meet the requirements of amplitude and current driving capability thereof, a current type operational amplifier is used for operational amplification, so that the required analog waveform output is finally realized; in the aspect of power supply, an isolation power supply is adopted, the power supply after voltage reduction supplies power to the isolation operational amplifier, and the power supply without voltage reduction directly supplies power to the current type operational amplifier.
A current acquisition circuit comprising: the device comprises a current sensor, a sampling resistor, a bias resistor, a controller and a diode;
the current sensor converts the power supply current into small-signal current, converts the small-signal current into voltage signals through the sampling resistor, sends the voltage signals to the controller for processing after following and biasing, and the biasing resistor performs biasing processing on the voltage signals so as to improve the acquisition precision of the small current;
The stabilized voltage supply works in a switching state, and high-frequency interference is easy to be connected in series in an analog signal, so that the current acquisition circuit acquires current in a Hall current sensor isolation mode, the real-time monitoring of the power utilization condition of a power load is realized, the protection control of the stabilized voltage supply is realized, and the output current of the stabilized voltage supply is acquired;
the secondary isolation compensation module realizes the isolation of the voltage regulation signal from the voltage-stabilized power supply, improves the anti-interference performance of the whole power supply system, realizes the isolation of the analog signal and improves the anti-interference performance of the whole power supply system;
Drawings
the accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a circuit diagram of a rectifying and filtering circuit of the present invention;
FIG. 2 is a block diagram of a primary voltage compensation circuit of the present invention;
FIG. 3 is a block diagram of the multi-path detection isolation unit in the two-stage isolation compensation module according to the present invention;
FIG. 4 is a block diagram of the voltage comparison module of the present invention;
FIG. 5 is a block diagram of an analog-to-digital conversion isolation unit according to the present invention;
FIG. 6 is a block diagram of the current isolation module of the present invention;
FIG. 7 is a circuit diagram of the current acquisition circuit of the present invention;
FIG. 8 is a block diagram of the high voltage signal isolation unit of the present invention;
Detailed Description
the following description and the annexed drawings set forth in detail certain illustrative embodiments of the invention to enable those skilled in the art to practice them, and the subject matter of the invention is more particularly described below by way of example and with reference to the accompanying drawings.
Referring to fig. 1, a circuit diagram of a rectifying and filtering circuit of the present invention is shown;
the rectification filter circuit consists of a single-phase bridge rectifier circuit and an LC-pi filter circuit;
the single-phase bridge rectifier circuit includes: the power supply comprises a power transformer, a rectifier diode VD1, a rectifier diode VD2, a rectifier diode VD3, a rectifier diode VD4 and a load resistor RL; the rectifier diode VD1, the rectifier diode VD2, the rectifier diode VD3 and the rectifier diode VD4 form a rectifier bridge;
The transformer converts the alternating voltage of a power grid into the alternating voltage required by the single-phase bridge rectifier circuit, the rectifier diode VD1 is conducted in the forward direction in the positive half cycle of a sine alternating current power supply, the rectifier diode VD2 is cut off in the reverse direction, the current passes through the rectifier diode VD1, and the load resistor RL returns to the zero point of a center tap of the transformer to form a loop;
the load resistor RL obtains half-wave rectification voltage and current, when power supply voltage is in the positive half cycle of U2, the potential of the end a of the transformer secondary winding is higher than that of the end b, VD1 and VD3 are conducted under the action of forward voltage, VD2 and VD4 are cut off under the action of reverse voltage, current starts from the end a of the transformer secondary winding, passes through VD1, RL and VD3, returns from the end b to form a passage, and passes through the load resistor RL.
the LC-pi filter circuit is formed by combining an inductor, a capacitor filter and an LC filter;
after alternating current is rectified, most of alternating current components are stopped by the inductor, and a small part of alternating current components pass through the inductor and then are subjected to double filtering by the capacitor filter and the LC filter, so that the obtained voltage is smoother.
referring to fig. 2, a block diagram of a primary voltage compensation circuit of the present invention is shown;
A primary voltage compensation circuit, comprising: the voltage stabilizing device comprises a voltage stabilizing resistor R, a voltage stabilizing triode VT, a load RL, a voltage dividing resistor R1, a voltage dividing resistor R2, a compensating resistor R3, a compensating resistor R4, a contactor, a relay, a backflow preventing diode VD1 and a voltage stabilizing diode VDZ;
the voltage stabilizing resistor R, the voltage stabilizing triode VT and the load RL are connected in series, when the load RL changes to cause the output voltage UO to change, the change of the voltage UO is reflected on the emitter junction voltage of the voltage stabilizing triode VT, and the voltage stabilizing triode VT realizes a series voltage stabilizing circuit through the series voltage stabilizing resistor, so that the voltage UO is adjusted to keep the basic stability of the output voltage;
the compensation resistors R3 and R4 are used for ensuring that the load is not damaged due to overhigh power output caused by the suspension and accidental disconnection of the compensation points in the switching process of the compensation points;
the voltage stabilizing diode VDZ is packaged by glass, reverse current is suddenly increased, the voltage stabilizing diode VDZ enters a breakdown region, and at the moment, even if the reverse current is changed in a large range, reverse voltages at two ends of the voltage stabilizing diode can be kept stable and unchanged;
the voltage dividing resistors R1 and R2 are resistors with a type selection kilohm level to realize power supply output voltage sampling;
the conduction end of the backflow prevention diode VD1 is electrically connected with a contactor, and the contactor realizes the control of load power supply and prevents current from flowing back;
The power supply receives a power supply instruction to close the contactor and the relay, the voltage of the load end is divided by voltage dividing resistors R1 and R2 and then is sent to the input end of the power supply, and the voltage is regulated by an external regulator to realize the output voltage stabilization of the power supply; the working time sequence that the power supply circuit is firstly connected with the compensation circuit and then connected with the load is realized, and the risk that the load device is damaged because the compensation circuit is firstly connected is avoided.
referring to fig. 3, a block diagram of a multi-path detection isolation unit in the secondary isolation compensation module of the present invention is shown;
a secondary isolation compensation module comprising:
the multi-channel detection isolation unit comprises a multi-channel switch, a shift register, a communication isolation module 1 and a communication isolation module 2;
the multi-path detection isolation unit is used for detecting multi-path voltage signals, is provided with 3 single-ended 8-channel multi-path switches, detects 1 path at the same time by each single-ended single-channel multi-path switch, and is controlled by a shift register through a serial port to a parallel port; the communication isolation module 1 can read 3 paths of voltage signals at the same time, and can read all 24 paths of signals by controlling the communication isolation module 2 for 8 times, so that the most voltage can be read by the least pins.
Referring to fig. 4, a block diagram of the voltage comparison module of the present invention is shown;
The voltage comparison module comprises a comparator, a DC-DC voltage reduction module and an isolator;
the voltage signal provides power for the outside and provides a group of isolated square wave signals, the external power firstly provides power for the isolated comparator and then provides voltage for the isolated device through the DC-DC voltage reduction module, the generated voltage generates a reference voltage through voltage division for the comparator to use, the voltage signal output by the isolator is compared with the reference voltage and is generated from square wave signals with the same amplitude of the external voltage through the comparator, the finally output square wave signal is the real voltage transmitted to the load, and the voltage of the load can be compared and analyzed through the fluctuation condition of the square wave signal.
referring to fig. 8, a block diagram of a high voltage signal isolation unit according to the present invention is shown;
the high-voltage signal isolation unit comprises a displacement buffer and a high-voltage solid-state relay;
the displacement buffer is serially input and parallelly output in a serial port-to-parallel port mode;
each displacement buffer can realize 8-path output control, and after n displacement buffers are cascaded, 8-path signals can be controlled through 3 control lines;
the high-voltage solid-state relay is used for isolating output and control, the high-voltage solid-state relay sends a high-voltage signal to one end of the output side, and the high-voltage solid-state relay is switched to the output side to be output for use when the high-voltage signal needs to be output.
Referring to fig. 5, a block diagram of an analog-to-digital conversion isolation unit according to the present invention is shown;
An analog-to-digital conversion isolation unit comprising: DAC (analog-to-digital converter), an isolation power supply, a reference voltage module and an operational amplifier;
After external power supply is carried out on the current type DAC selected by the DAC, low power supply voltage is generated to be used by the isolation communication component, and an additional voltage reduction module is omitted;
the DAC communicates with the isolation communication component to generate voltage with a certain amplitude, the reference voltage module has reference voltage in a certain range, the isolation power supply supplies power to the DAC and the reference voltage module through voltage reduction, the reference voltage module provides reference for the DAC, the precision of the voltage generated by the DAC is guaranteed, and the reference voltage and the voltage generated by the DAC generate required direct-current voltage signals through the operational amplifier.
Referring to fig. 6, a block diagram of the current isolation module of the present invention is shown;
a galvanic isolation module comprising: a high-speed DAC, a high-speed isolation operational amplifier and an isolation power supply;
the high-speed DAC adopts 12 data lines for communication, and can realize any wave;
the high-speed isolation operational amplifier is used for realizing isolation, and in order to meet the requirements of amplitude and current driving capability thereof, a current type operational amplifier is used for operational amplification, so that the required analog waveform output is finally realized; in the aspect of power supply, an isolation power supply is adopted, the power supply after voltage reduction supplies power to the isolation operational amplifier, and the power supply without voltage reduction directly supplies power to the current type operational amplifier.
referring to fig. 7, a circuit diagram of the current acquisition circuit of the present invention is shown;
a current acquisition circuit comprising: the device comprises a current sensor, a sampling resistor, a bias resistor, a controller and a diode;
The current sensor converts the power supply current into small-signal current, converts the small-signal current into voltage signals through the sampling resistor, sends the voltage signals to the controller for processing after following and biasing, and the biasing resistor performs biasing processing on the voltage signals so as to improve the acquisition precision of the small current;
The diode is a double Schottky diode, has the characteristic of low conduction voltage drop, and is suitable for a voltage clamping protection controller;
the stabilized voltage supply works in a switching state, and high-frequency interference is easy to be connected in series in an analog signal, so that the current acquisition circuit acquires current in a Hall current sensor isolation mode, the real-time monitoring of the power utilization condition of a power load is realized, the protection control of the stabilized voltage supply is realized, and the output current of the stabilized voltage supply is acquired;
The secondary isolation compensation module realizes the isolation of the voltage regulation signal and the voltage-stabilized power supply, improves the anti-interference performance of the whole power supply system, realizes the isolation of the analog signal and improves the anti-interference performance of the whole power supply system.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (9)
1. a system for compensating for a remote power supply of a regulated power supply, comprising:
The rectification filter circuit consists of a single-phase bridge rectifier circuit and an LC-pi filter circuit;
the single-phase bridge rectifier circuit includes: the power supply comprises a power transformer, a rectifier diode VD1, a rectifier diode VD2, a rectifier diode VD3, a rectifier diode VD4 and a load resistor RL; the rectifier diode VD1, the rectifier diode VD2, the rectifier diode VD3 and the rectifier diode VD4 form a rectifier bridge;
The LC-pi filter circuit is formed by combining an inductor, a capacitor filter and an LC filter;
most of alternating current components after the inductor group stops current rectification, and a small part of alternating current components passing through the inductor are subjected to double filtering by the capacitor filter and the LC filter to obtain smoother voltage;
a primary voltage compensation circuit, comprising: the voltage stabilizing device comprises a voltage stabilizing resistor R, a voltage stabilizing triode VT, a load RL, a voltage dividing resistor R1, a voltage dividing resistor R2, a compensating resistor R3, a compensating resistor R4, a contactor, a relay, a backflow preventing diode VD1 and a voltage stabilizing diode VDZ;
the voltage stabilizing resistor R, the voltage stabilizing triode VT and the load RL are connected in series, and when the output voltage changes due to the change of the load RL, the voltage change is reflected on the emitter junction voltage of the voltage stabilizing triode VT;
the voltage stabilizing triode VT realizes a series voltage stabilizing circuit through a series voltage stabilizing resistor and is used for adjusting voltage to keep the basic stability of output voltage;
a current acquisition circuit comprising: the device comprises a current sensor, a sampling resistor, a bias resistor, a controller and a diode;
the current sensor converts the power supply current into small-signal current, converts the small-signal current into voltage signals through the sampling resistor, sends the voltage signals to the controller for processing after following and biasing, and the biasing resistor performs biasing processing on the voltage signals so as to improve the acquisition precision of the small current;
The diode is a double Schottky diode, has the characteristic of low conduction voltage drop, and is suitable for a voltage clamping protection controller.
2. the regulated power supply remote power supply compensation system of claim 1, wherein said transformer transforms the mains ac voltage into the ac voltage required by said single-phase bridge rectifier circuit;
the rectifier diode VD1 is conducted in the positive half cycle of the sine alternating current power supply in the positive direction;
and when the rectifier diode VD2 is cut off reversely, the current flows to the load resistor RL through the rectifier diode VD1 and then returns to the zero point of the center tap of the transformer to form a loop.
3. the system of claim 1, wherein the compensation resistors R3 and R4 are used to ensure that the load is not damaged by the power output due to the suspension of the compensation point and the accidental disconnection of the compensation point during the switching process of the compensation point.
4. the regulated power supply remote power supply compensation system according to claim 1, wherein said zener diode VDZ is glass-encapsulated, and when reverse current suddenly increases, said zener diode VDZ enters a breakdown region, and then the reverse voltage across said zener diode remains stable even if the reverse current varies in a wide range.
5. the system of claim 1, wherein the conduction end of the back-flow prevention diode VD1 is electrically connected to a contactor, which controls the power supply of the load and prevents the current from flowing back.
6. a regulated power supply remote power compensation system according to claim 1, further comprising: a secondary isolation compensation module;
the second-stage isolation compensation module further comprises:
the voltage comparison module is used for outputting the real square wave signal voltage of the load and comparing the voltage of the load according to the fluctuation condition of the square wave signal;
The voltage comparison module comprises a comparator, a DC-DC voltage reduction module and an isolator;
the comparator supplies power through the outside, voltage is supplied to the isolation device through the DC-DC voltage reduction module, and the generated voltage is divided to generate reference voltage for the comparator to use.
7. The regulated power supply remote power compensation system of claim 6, wherein the secondary isolation compensation module further comprises:
The multi-path detection isolation unit is used for detecting multi-path voltage signals;
The multi-path detection isolation unit comprises: a multiway switch and a shift register;
the multi-way switch selects 3 single-end 8-channel multi-way switches, each single-end single-channel multi-way switch detects 1 channel at the same time, and the shift register is controlled by a serial port to a parallel port.
8. the regulated power supply remote power supply compensation system of claim 6, wherein the voltage signal output by the isolator is compared with a reference voltage and a square wave signal with the same amplitude as the external voltage is generated by the comparator.
9. the regulated power supply remote power compensation system of claim 6, wherein the secondary isolation compensation module further comprises: a high voltage signal isolation unit;
the high-voltage signal isolation unit further comprises:
the shift buffer is serially input and parallelly output in a serial port to parallel port mode;
and the high-voltage solid-state relay is used for isolating the output from the control.
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| CN201910922198.1A CN110544946A (en) | 2019-09-27 | 2019-09-27 | Constant voltage power supply remote end power supply compensating system |
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| CN201910922198.1A CN110544946A (en) | 2019-09-27 | 2019-09-27 | Constant voltage power supply remote end power supply compensating system |
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| CN112491406A (en) * | 2020-11-26 | 2021-03-12 | 核工业西南物理研究院 | High-voltage solid-state modulator with voltage regulation capability |
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| CN115436689A (en) * | 2022-09-23 | 2022-12-06 | 陕西省电子技术研究所有限公司 | Electricity zero position testing arrangement based on two fortune are put and hall current sensor |
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Application publication date: 20191206 |