CN1780082A - Method and device for automatic compensation of DC power load voltage drop - Google Patents

Abstract

The invention discloses a method and a device for automatically compensating the voltage drop of a power supply of a direct current power load, which are directly connected with the secondary side end of a high-voltage and high-current system to be applied, and carry out detection and automatic compensation procedures by a direct current system, so that the defect of system halt or damage caused by instant voltage drop is overcome.

Description

Method and device for automatic compensation of DC power load voltage drop

technical field

The present invention relates to a method and device for automatically compensating the instantaneous voltage drop of a power load with direct current. Compensation program.

Background technique

In terms of the operation of high-tech industries, some equipment or systems include:

(1) Static pressure control operation in clean room (CLEAN ROOM) or other indoor confined spaces that have related influence on static pressure control.

(2) The operation of the exhaust system that generates and stores toxic volatile gases.

(3) The equipment or system that crashes in the middle of the processing or production process due to any unexpected factors cannot be accepted.

(4) The equipment or system that crashes in the middle of the process of chemical reaction caused by any unexpected factors cannot be accepted.

Once it crashes during operation, especially when the power supply is unstable, it will seriously affect the safety of operators and cause defective products on the production line;

Therefore, in order to solve this problem for a long time, an alternating current (AC) uninterruptible power system (UPS) has been used to solve it, and the technology of the uninterruptible power system has made great progress.

Generally, the AC UPS uninterruptible power system is connected in series to the power supply end, that is, one side of the overall structure; according to practical experience, it can be found that the above UPS uninterruptible power system actually has the following disadvantages:

1. The high-frequency harmonics generated by the frequency converter saturate the UPS inverter transformer.

2. When the motor is started, it is twice the rated capacity, and the UPS capacity also needs to be doubled, otherwise the UPS will fail and trip.

3. To use UPS, a set of passive harmonic filters must be added.

4. The UPS design was originally designed for computer loads, but it cannot be fully applied to motors and other large power loads after switching to use.

5. There is no problem with UPS matching with electrical appliances that only use DC, but when running a frequency converter, multi-level energy conversion is required, and the efficiency is poor.

6. When UPS uses multi-level energy conversion, its equipment is too complicated, with many variables, and the failure rate is relatively increased.

On the other hand, after analysis, the real key factor that will cause the system or equipment to crash is usually not the informed, predictable or sudden complete power failure, but the sudden instantaneous voltage drop in the normal power supply state. The so-called "Instantaneous voltage drop" means that the effective value of the voltage drops to between 10% and 90% of the standard value (Nominal value), and lasts for half a cycle to several seconds.

Industrial production equipment or systems, especially equipment with precision processes such as wafers, nanometer, microcomputer information equipment, frequency converters, etc., their electrical loads are very sensitive to instantaneous voltage drops. Cause the Fab process machine to crash. There are many reasons for this kind of power quality problem, including short-term voltage dips lasting several cycles to several seconds caused by adjacent feeder or bus accidents, the so-called Voltage Sag or Voltage Dip, or capacitor switching, Or electric shock, etc., the transient (TRANSIENT) phenomenon caused by it lasts for about one week or less, while in a steady state, the power quality factor at the load end is harmonics or voltage flicker.

The above-mentioned equipment or systems are all industrial-grade with high voltage and high current. Since various solutions currently focus on the field of AC power supply, the AC UPS uninterruptible power supply system and equipment necessary for general factory operation are all plant-wide equipment. , it is necessary to plan another large space for placing batteries and uninterruptible power system equipment, resulting in a huge burden in cost; obviously, using AC UPS uninterruptible power system is not an ideal solution to prevent and solve instantaneous load voltage drop.

In view of this, the inventor of this case, based on the rich experience accumulated in the research and development and manufacturing of related equipment for many years, conducted in-depth analysis and research, and after long-term efforts, developed the "DC power load power supply voltage drop automatic compensation method and its device" of this case. After field trial and verification, it is found that it can effectively achieve the set practical efficacy target, and it is an ideal invention.

Contents of the invention

The object of the present invention is to provide a method and device for automatically compensating the voltage drop of a DC power load power supply, which can simplify the huge and complex equipment required for using an AC uninterruptible power supply system, and reduce the failure rate and cost.

In order to achieve the above object, the technical solution of the present invention is: a DC power load power supply voltage drop automatic compensation method (DC VOLTAGE DIP COMPENSATION SYSTEM, referred to as VDCS), its composition framework includes the following:

A. Charging unit

B. DC voltage drop compensation control unit

C. Battery pack unit

D. Load unit

and other parts, wherein the DC voltage drop compensation control unit includes:

A. Input processing

B. Pressure drop automatic compensation control processing

C. Output processing

The DC voltage drop compensation control unit is specifically composed of an error detection module, an input module, a sensing module, a control module, a DC power supply module, an output module, and an IGBT module.

VDCS is connected to the DC side in parallel, that is, the secondary side of the high-voltage and high-current system to be installed;

The input terminal processing adopts the starting auxiliary circuit commonly used by single-phase induction motors or Permanent Split Capacitor motors, and applies Positive Temperature Coefficient PTCR to the VDCS of the system as a shunt circuit to achieve pre-charging. The voltage on the drive bus reaches a predetermined value;

The input terminal processing (input module) is composed of positive and negative SCR1, SCR2, PTCR circuits at the input terminal, and filter energy storage capacitors between the buses;

Its method is:

When the system starts to activate and run, the battery pack has been charged and stored; when the system VDCS is in a normal state, the SCR1 and SCR2 at the input end of the system VDCS are open, and the current bypasses the PTCR to pre-charge the capacitor between the buses. Bring the voltage value of the bus to the default value. During initial operation, since the default value of the driving voltage is greater than the pre-stored energy of the battery pack, the control module drives the IGBT module, boosts and maintains the default value of the driving voltage.

The processing method of pressure drop automatic compensation control is as follows:

When the control module detects that the line voltage suddenly drops suddenly, the output signal drives the error detection module to apply the SCR circuit, and acts on the output signals of the input and output terminals to compensate the output load driving voltage due to the instantaneous voltage drop. difference.

Output terminal processing, using a reactance energy storage circuit, adjusts the voltage difference value of the load driving voltage due to the instantaneous voltage drop;

Its method is:

A. The secondary bus is supplied to the DC power module, which is processed by the power module and then distributed to supply the DC power required by the control module and the error detection module; at this time, the power module will preset the low voltage value of the bus, which is supplied by the secondary bus Voltage comparison, when the supplied voltage is indeed lower than the default value of the voltage, a low voltage signal will be output to the control module for confirmation;

B. When the control module finds that there is insufficient driving voltage during the initial operation, because the aforementioned input terminal processing only precharges the voltage to the capacitor, but when the driving voltage on the secondary bus is insufficient, the control module will determine that the driving voltage is insufficient, so Start to drive the IGBT module, so that the reactor can store energy at a very high speed, so that the bus drive voltage is boosted to the required value; and the sensing module can stop the IGBT module after being sensed by the CT (CURRENT TRANSMITTER) and notifying the control module for confirmation Its action, completes the compensation and uses the driving voltage;

C. After comparing and confirming the control module with the voltage fed back from the secondary bus, it confirms that the input terminal processing pre-charging is completed and the fuse switch is normal, so the control module sends a signal to the error detection module for confirmation, and completes the confirmation error detection Module execution signal backup;

D. When the control module finds a sudden drop in voltage, it drives the error detection module to act on the output signals of the input terminal and the output terminal, and releases the energy stored in the aforementioned bus through the reactance to compensate for the difference due to the instantaneous voltage drop. To maintain a constant output load voltage; and the IGBT module receives the control module signal for boosting operation;

E. If the voltage drop is very short for an instant, then VDCS will automatically operate as the above procedure, and reserve the pre-stored voltage again;

F. If the voltage drop is completely cut off, VDCS will continue to operate until the power of the battery pack is fully discharged.

An automatic compensation device for voltage drop of a DC power load power supply, the composition structure of which includes:

A. Charging unit

B. DC voltage drop compensation control unit (VDCS)

C. Battery pack unit

D. Load unit

The DC voltage drop compensation control unit is a modular combination including two functions of "converting" and "boosting", which is achieved by the interaction of the following modules:

A. DETECING MODULE

B. Input SCR module (INPUT SCR MODULE)

C. Sensing module (SENSING MODULE)

D. CONTROL MODULE

E. DC power supply module (DC POWER SUPPLY MODULE)

F. Output SCR module (OUTPUT SCR MODULE)

G. IGBT module (IGBT MODULE)

1), variable flow processing:

It is composed of input module PTCR, IGBT module, reactor, capacitor, filter, control circuit and protection circuit components and circuits.

Initially, the current flows through the pre-charging circuit from the PTCR and interacts with the IGBT module to provide the required accurate voltage and current. The IGBT module used is a switching component. When the voltage is in a normal state, if the DC voltage of the battery is insufficient, the IGBT Since the output signal of the control module triggers the IGBT module, it stores energy in the reactor;

2), boost processing:

VDCS adopts an independent boost design. The battery pack is connected in series with all the lead-acid batteries to boost the required voltage, and the capacitor part is also connected in series. Each triggers the circuit independently. At the same time, the IGBT module is triggered by the output signal of the control module. Reactor energy storage.

The monitoring and interlocking functions and action modes of each module of the VDCS control unit are:

A. When the voltage is normal and the error detection module detects that everything is normal, the normal signal is sent to the control module, and the output SCR module does not act at this time.

B. The sensing module is known by the current transmitter (CURRENT TRANSMITIER):

1) When the voltage of the battery pack is insufficient, the voltage supplied to the load end is insufficient, the aforementioned sensing module outputs an abnormal signal and transmits it to the control module, and the control module sends a control signal to the charger to charge the battery and monitor the sensing circuit Control variable flow processing and boost processing. The IGBT module triggers the IGBT by the output signal of the control module (all DIODE, SCR, and IGBT components can generate intermittent and continuous ON/OFF trigger actions), so that it can store energy in the reactor.

2) If the voltage of the battery pack is normal, it is in standby state.

C. When the instantaneous voltage drop is abnormal, the error detection circuit will send out an abnormal signal and send it to the control module to make the output SCR module act, and send out the full voltage in backup to compensate for the voltage drop.

After adopting the above scheme, the VDCS of the present invention mainly lies in the fact that its control point is located at the secondary DC power supply, not at the primary AC power supply, so it is directly aimed at the secondary DC power supply at the load end, in addition to exempting the primary side AC power supply related to the overall system There are many devices, compared with the whole plant system, the processing scope is greatly reduced, and the front-end problem factors are reduced. In addition to the same function as the general AC UPS for complete power failure processing, it will automatically compensate the load power supply voltage when there is an instantaneous voltage drop of the DC power load power supply voltage, so that the load output terminal can still maintain normal output (on the system, DC The power required by the load equipment is supplied by the mains (AC). Due to the instantaneous voltage drop of the mains, it will also cause a voltage drop of the DC load output, causing the equipment load to crash or even be damaged).

Therefore, the present invention is applied to the automatic compensation of the voltage drop of the DC power load operated by all DC power supply parts (such as frequency converters), which can ensure the normal operation of the equipment, and will not supply power and cut off the power due to instantaneous voltage drop without warning, insufficient power voltage drop The abnormal state causes the equipment to crash, and can continuously provide stable DC power for important loads. When the power failure is eliminated and the normal power supply is restored again, the system will automatically recover without any impact on the load.

From this we can see:

A. The VDCS of this system is suitable for any electrical appliance required for DC power supply in the market.

B. The VDCS of this system is applicable to any brand inverter products on the market.

Description of drawings

Fig. 1 is the voltage drop compensation flowchart of VDCS of the present invention;

Fig. 2 is the block diagram of the control unit of VDCS of the present invention;

Fig. 3 is a system single line diagram of the present invention;

Fig. 4 is a schematic diagram of the processing of the VDCS of the present invention to the DC part of the frequency converter;

Figure 5 is a schematic diagram of the process of automatic charging to maintain the instantaneous voltage drop of the system at any time when the VDCS detects that the battery compensation power capacity is insufficient when the installed system is operating normally;

Figure 6 is a schematic diagram of the process of VDCS detecting that the battery compensation power capacity is sufficient when the installed system is operating normally;

Fig. 7 is a schematic diagram of the process of automatically compensating the DC power to maintain the normal output voltage when the system installed in the VDCS of the present invention detects an instantaneous voltage drop or power failure;

Fig. 8 is a monitoring flowchart of the VDCS module of the present invention;

Fig. 9 is a schematic diagram showing the differences between the present invention and UPS.

Detailed ways

The present invention is an automatic compensation method for DC power load voltage drop (DC VOLTAGE DIPCOMPENSATION SYSTEM, referred to as VDCS), and its composition framework includes the following:

A. Charging unit

B. DC voltage drop compensation control unit

C. Battery pack unit

D. Load unit

and other parts, wherein the DC voltage drop compensation control unit includes:

A. Input processing

B. Pressure drop automatic compensation control processing

C. Output processing

As shown in FIG. 1 , the DC voltage drop compensation control unit is specifically composed of an error detection module, an input module, a sensing module, a control module, a DC power supply module, an output module, and an IGBT module.

Among them, the input terminal processing adopts a single-phase induction motor or the motor of the so-called Permanent Split Capacitor used to start the auxiliary circuit, and the PositiveTemperature Coefficient PTCR is used as the shunt circuit in the VDCS of the system to achieve pre-charging and drive the voltage on the bus to a predetermined value. .

The input terminal processing (input module) is composed of positive and negative SCR1, SCR2, PTCR and other circuits at the input terminal, and filter energy storage capacitors between the buses.

Its program is shown in Figure 1 and Figure 2. When the system starts to activate and run, the battery pack has been charged and stored; when the system VDCS is in a normal state, the SCR1 and SCR2 at the system VDCSF input end are open circuits, and the current passes through the PTCR bypass. Through, pre-charge the capacitor between the buses, so that the voltage value of the bus reaches the default value. During the initial operation, since the default value of the driving voltage is greater than the pre-stored energy of the battery pack, the controllable module drives the IGBT module, boosts and maintains the default value of the driving voltage.

The method of the aforementioned DC voltage drop automatic compensation control process is as follows:

When the control module detects that the line voltage suddenly drops suddenly, the output signal drives the error detection module to apply the SCR circuit, and acts on the output signals of the input and output terminals, so as to compensate the output load driving voltage caused by the instantaneous voltage drop. differential pressure value.

The aforementioned output terminal processing uses a reactance energy storage circuit to adjust the voltage difference value of the load driving voltage due to the instantaneous voltage drop.

Its method is:

A. The secondary bus is supplied to the DC power module, which is processed by the power module and then distributed to supply the DC power required by the control module and the error detection module; at this time, the power module will preset the low voltage value of the bus, which is supplied by the secondary bus Voltage comparison, if the supplied voltage is indeed lower than the default value of the voltage, a low voltage signal will be output to the control module for confirmation.

B. When the control module finds that there is insufficient driving voltage during the initial operation, because the aforementioned input terminal processing only precharges the voltage to the capacitor, but when the driving voltage on the secondary bus is insufficient, the control module will determine that the driving voltage is insufficient, so Start to drive the IGBT module, so that the reactor can store energy at a very high speed, so that the bus drive voltage is boosted to the required value; and the sensing module can stop the IGBT module after being sensed by the CT (CURRENT TRANSMITTER) and notifying the control module for confirmation Action, complete compensation and standby (standby) driving voltage.

C. After comparing and confirming the control module with the voltage fed back from the secondary bus, it confirms that the input terminal processing pre-charging is completed and the fuse switch is normal, so the control module sends a signal to the error detection module for confirmation, and completes the confirmation error detection Module RUN signal standby (standby).

D. When the control module finds a sudden drop in voltage, it will drive the error detection module to act on the output signals of the input terminal and the output terminal, and release the energy stored in the aforementioned bus through the reactance to compensate for the difference due to the instantaneous voltage drop , to maintain a constant output load voltage; and the IGBT module receives the signal from the control module for boosting operation.

E. If the voltage drop is very short for an instant, then VDCS will automatically operate as the above-mentioned procedure, and keep the pre-stored voltage for standby again.

F. If the voltage drop is completely cut off, VDCS will continue to operate until the power of the battery pack is fully discharged.

The main difference between the present invention (VDCS) and the conventional AC UPS uninterruptible power system is that the present invention is parallel connected to the DC side, that is, the secondary side of the overall structure; please refer to FIG. 9 .

The present invention is a DC TO DC device, and its application object can be various commercially available DC TODC devices, as shown in Figure 4.

Please refer to Figure 5, Figure 6 and Figure 7. Under normal mains supply, the charger unit/rectifier unit (CHARGER/RECTIFIER) converts the mains power into a DC power supply and supplies power to the battery pack unit (BATTERY). Current-limited voltage-limited charging and connection of DC power to the input of the inverter unit (INVERTER). When it rectifies the AC power to DC, the rectifier can eliminate the abnormal surge, noise and frequency instability generated in the mains, so as to provide more stability for the battery pack unit (BATTERY) and the inverter unit (INVERTER). and clean DC power.

When the mains power is abnormal, the battery pack unit (BATTERY) connected to the bus provides power to the converter unit (INVERTER) and the DC conversion controller unit (CONVERTER), so that the DC output (supplying the inverter system) and the AC output (Supply control system) There will be no interruption or voltage drop, and then achieve the function of power backup and continuous supply of normal DC voltage.

Below is the device implementing the present invention, and its composition comprises:

A. Charging unit

B. DC voltage drop compensation control unit

C. Battery pack unit

D. Load unit

Among them, the DC voltage drop compensation control unit is a modular combination, including two functions of "conversion" and "boosting", which are achieved by the interaction of the following modules:

A. DETECING MODULE

B. Input SCR module (INPUT SCR MODULE)

C. Sensing module (SENSING MODULE)

D. CONTROL MODULE

E. DC power supply module (DC POWER SUPPLY MODULE)

F. Output SCR module (OUTPUT SCR MODULE)

G. IGBT module (IGBT MODULE)

1. Variable flow processing:

It consists of input module PTCR, IGBT module, reactor, capacitor, filter, control circuit and protection circuit and other components and circuits.

Initially, the current flows through the pre-charging circuit from the PTCR and interacts with the IGBT module to provide the required voltage and current. Among them, the IGBT module used is a switch component. When the voltage is in a normal state, if the DC voltage of the battery is insufficient, the IGBT triggers the IGBT due to the output signal of the control module. All DIODE, SCR, and IGBT components can generate intermittent continuous ON /OFF trigger action), so that it can store energy in the reactor.

2. Boost treatment:

In this case, the VDCS adopts an independent boost design. The battery pack is connected in series with all the lead-acid batteries to boost the voltage to the required voltage. The capacitors are also connected in series, each with its own independent firing circuit. At the same time, the IGBT module is triggered by the output signal of the control module. All DIODE, SCR, and IGBT components of the IGBT can generate intermittent continuous ON/OFF trigger actions), so that they can store energy in the reactor and operate in the best state to reduce electricity costs. In addition, adding parallel protection circuits , with the help of its effective surge absorption ability to suppress surges and interference, it can reduce the failure of boost components (as shown in Figure 7).

The monitoring and interlocking functions and actuation modes of each module in the VDCS control unit of the present invention are shown in Figure 8:

A. When the voltage is normal and the error detection module detects that everything is normal, the normal signal is sent to the control module, and the output SCR module does not act at this time.

B. The sensing module is informed by the current transmitter (CURRENT TRANSMITTER):

1. When the voltage of the battery pack is insufficient, the voltage supplied to the load terminal is insufficient, the aforementioned sensing module outputs an abnormal signal and transmits it to the control module, and the control module sends a control signal to the charger to charge the battery, and monitors the sensing circuit control Variable flow processing and boost processing. For the IGBT module, because the output signal of the control module triggers all the DIODE, SCR, and IGBT components of the IGBT to generate intermittent and continuous ON/OFF trigger actions), it can store energy in the reactor until the voltage reaches enough for the load. The value is spare.

2. If the voltage of the battery pack is normal, it is in a standby state.

C. When the instantaneous voltage drop is abnormal, the error detection circuit will send an abnormal signal and send it to the control module after detection, and the output SCR module will act, and send out the full amount of voltage in the backup to compensate for the voltage drop, so that the load can be maintained Normal output voltage is not affected.

D. For all abnormal states of VDCS such as SCR burnout, heat sink overheating, cooling fan burnout failure, connection control, feedback signal interruption, etc., the system will automatically shut down and shut down all the VDCS due to high voltage and high current. The abnormal signal is output to the control unit for supervision and processing.

E. The DC control power required by all the modules is supplied by the DC power supply to the modules.

The VDCS of the present invention can be installed individually or individually, and is especially aimed at a DC-to-DC system, which is different from a traditional AC-to-AC or AC-to-DC system. For the continuous normal output of the system, this kind of equipment installation for the load power supply mode has miniaturization, independence and low cost for the DC part of the secondary side. And it is suitable for the above four kinds of places where the absolute demand for stable effects is extremely dangerous and critical.

The most important feature of the VDCS of the present invention is that its control point is located at the secondary DC power supply, not at the primary AC power supply, so it is directly aimed at the secondary DC power supply at the load end, in addition to exempting the primary side AC power supply equipment related to the overall system. Compared with the whole plant system, the processing scope is greatly reduced and the front-end problem factors are reduced. In addition to the same function as the general AC UPS for complete power failure processing, it will automatically compensate the load power supply voltage when there is an instantaneous voltage drop of the DC power load power supply voltage, so that the load output terminal can still maintain normal output (on the system, DC The power required by the load equipment is supplied by the mains (AC). Due to the instantaneous voltage drop of the mains, it will also cause a voltage drop of the DC load output, causing the equipment load to crash or even be damaged).

Therefore, the present invention is applied to the automatic compensation of the voltage drop of the DC power load operated by all DC power supply parts (such as frequency converters), which can ensure the normal operation of the equipment, and will not supply power and cut off the power due to instantaneous voltage drop without warning, insufficient power voltage drop The abnormal state causes the equipment to crash, and can continuously provide stable DC power for important loads. When the power failure is eliminated and the normal power supply is restored again, the system will automatically recover without any impact on the load. From this we can see:

A. The VDCS of this system is suitable for any electrical appliance required for DC power supply in the market.

B. The VDCS of this system is applicable to any brand inverter products on the market.

Claims (6)

1. A DC power load power supply voltage drop automatic compensation method (DC VOLTAGE DIPCOMPENSATION SYSTEM, referred to as VDCS), characterized in that: its framework includes the following: A. Charging unit B. DC voltage drop compensation control unit C. Battery pack unit D. Load unit The DC voltage drop compensation control unit includes: A. Input processing B. Pressure drop automatic compensation control processing C. Output processing The DC voltage drop compensation control unit is specifically composed of an error detection module, an input module, a sensing module, a control module, a DC power supply module, an output module, and an IGBT module. VDCS is connected to the DC side in parallel, that is, the secondary side of the high-voltage and high-current system to be installed; 2. The method for automatic compensation of voltage drop of DC power load power supply as claimed in claim 1, characterized in that: the input terminal processing adopts the starting auxiliary circuit commonly used by single-phase induction motors or Permanent Split Capacitor motors, and applies Positive Temperature CoefficientPTCR is used as a shunt circuit in the VDCS of the system to achieve pre-charging and drive the voltage on the bus to a predetermined value; The input terminal processing (input module) is composed of positive and negative SCR1, SCR2, PTCR circuits at the input terminal, and filter energy storage capacitors between the buses; Its method is: When the system starts to activate and run, the battery pack has been charged and stored; when the system VDCS is in a normal state, the SCR1 and SCR2 at the input end of the system VDCS are open, and the current bypasses the PTCR to pre-charge the capacitor between the buses. Bring the voltage value of the bus to the default value. During initial operation, since the default value of the driving voltage is greater than the pre-stored energy of the battery pack, the control module drives the IGBT module, boosts and maintains the default value of the driving voltage. 3. The method for automatic compensation of voltage drop of DC power load power supply as claimed in claim 1, characterized in that: the automatic compensation control processing method for voltage drop is: When the control module detects that the line voltage suddenly drops suddenly, the output signal drives the error detection module to apply the SCR circuit, and acts on the output signals of the input and output terminals to compensate the output load driving voltage due to the instantaneous voltage drop. difference. 4. The method for automatically compensating the voltage drop of a DC power load power supply as claimed in claim 1, characterized in that: the output end processing uses a reactance energy storage circuit to adjust the voltage difference value of the load driving voltage due to the instantaneous voltage drop; Its method is: A. The secondary bus is supplied to the DC power module, which is processed by the power module and then distributed to supply the DC power required by the control module and the error detection module; at this time, the power module will preset the low voltage value of the bus, which is supplied by the secondary bus Voltage comparison, when the supplied voltage is indeed lower than the default value of the voltage, a low voltage signal will be output to the control module for confirmation; B. When the control module finds that there is insufficient driving voltage during the initial operation, because the aforementioned input terminal processing only precharges the voltage to the capacitor, but when the driving voltage on the secondary bus is insufficient, the control module will determine that the driving voltage is insufficient, so Start to drive the IGBT module, so that the reactor can store energy at a very high speed, so that the bus drive voltage is boosted to the required value; and the sensing module can stop the IGBT module after being sensed by the CT (CURRENT TRANSMITTER) and notifying the control module for confirmation Its action, completes the compensation and uses the driving voltage; C. After comparing and confirming the control module with the voltage fed back from the secondary bus, it confirms that the input terminal processing pre-charging is completed and the fuse switch is normal, so the control module sends a signal to the error detection module for confirmation, and completes the confirmation error detection Module execution signal backup; D. When the control module finds a sudden drop in voltage, it drives the error detection module to act on the output signals of the input terminal and the output terminal, and releases the energy stored in the aforementioned bus through the reactance to compensate for the difference due to the instantaneous voltage drop. To maintain a constant output load voltage; and the IGBT module receives the control module signal for boosting operation; E. If the voltage drop is very short for an instant, then VDCS will automatically operate as the above procedure, and reserve the pre-stored voltage again; F. If the voltage drop is completely cut off, VDCS will continue to operate until the power of the battery pack is fully discharged. 5. An automatic compensation device for voltage drop of DC power load power supply, its composition structure includes: A. Charging unit B. DC voltage drop compensation control unit (VDCS) C. Battery pack unit D. Load unit It is characterized in that the DC voltage drop compensation control unit is a modular combination including two functions of "converting" and "boosting", which is achieved by the interaction of the following modules: A. DETECING MODULE B. Input SCR module (INPUT SCR MODULE) C. Sensing module (SENSING MODULE) D. CONTROL MODULE E. DC power supply module (DC POWER SUPPLY MODULE) F. Output SCR module (OUTPUT SCR MODULE) G. IGBT module (IGBT MODULE) 1), variable flow processing: It is composed of input module PTCR, IGBT module, reactor, capacitor, filter, control circuit and protection circuit components and circuits. Initially, the current flows through the pre-charging circuit from the PTCR and interacts with the IGBT module to provide the required accurate voltage and current. The IGBT module used is a switching component. When the voltage is in a normal state, if the DC voltage of the battery is insufficient, the IGBT Since the output signal of the control module triggers the IGBT module, it stores energy in the reactor; 2), boost processing: VDCS adopts an independent boost design. The battery pack is connected in series with all the lead-acid batteries to boost the required voltage, and the capacitor part is also connected in series. Each triggers the circuit independently. At the same time, the IGBT module is triggered by the output signal of the control module. Reactor energy storage. 6. The automatic compensation device for voltage drop of DC power load power supply as claimed in claim 5, characterized in that: the monitoring and interlocking functions and action modes of each module of the VDCS control unit are as follows: A. When the voltage is normal and the error detection module detects that everything is normal, the normal signal is sent to the control module, and the output SCR module does not act at this time. B. The sensing module is informed by the current transmitter (CURRENT TRANSMITTER): 1) When the voltage of the battery pack is insufficient, the voltage supplied to the load end is insufficient, the aforementioned sensing module outputs an abnormal signal and transmits it to the control module, and the control module sends a control signal to the charger to charge the battery and monitor the sensing circuit Control variable flow processing and boost processing. The IGBT module triggers the IGBT by the output signal of the control module (all DIODE, SCR, and IGBT components can generate intermittent and continuous ON/OFF trigger actions), so that it can store energy in the reactor. 2) If the voltage of the battery pack is normal, it is in the standby state. C. When the instantaneous voltage drop is abnormal, the error detection circuit will send out an abnormal signal and send it to the control module to make the output SCR module act, and send out the full voltage in backup to compensate for the voltage drop.

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