RU2815916C1 - Redundant secondary power supply from two independent dc lines - Google Patents

Abstract

FIELD: power electronics.

SUBSTANCE: invention relates to power electronics, in particular to secondary power supply devices with redundancy, and can be used for uninterrupted power supply with constant stabilized voltage of consumers of various radioelectronic objects from two independent DC lines. Device comprises first (1) and second (2) inputs for connection of main and backup DC power supply lines, first (3) and second (4) auxiliary power sources, backup capacitive accumulator (5), first (6) power stage and second (7) power stage, first (8) current sensor, second (9) current sensor, control circuit (10) connected to auxiliary sources (3) and (4), power stages (6) and (7) and current sensors (8), (9) and equipped with digital interfaces, as well as output (11) for connection of consumer. First (3) auxiliary source is designed to provide power supply to control circuit (10), second (4) auxiliary source – for charging backup accumulator (5) and backup power supply of first source (3). Backup accumulator (5) is intended for power supply of first source (3) and power supply via output line (11). Control circuit (10) is configured to stabilize output voltage and uniform distribution of power consumption from the main and backup power supply lines and includes a circuit of protection against excess of input currents (101), driver (102) and microcontroller (103) configured to generate control signals to driver (102) to control operation of power stages (6) and (7) transistors, signal to enable or disable operation of second source (4), microcontroller (103) readiness signal for operation, which switches input currents (101) protection circuit to the current control mode, wherein circuit (101) enables operation of driver (102).

EFFECT: providing uniform distribution of consumed power from two independent power supply lines with simultaneous stabilization of output voltage of the secondary power supply device.

7 cl, 5 dwg, 2 tbl

Description

Technical field

The invention relates to power electronics, in particular to devices for secondary power supply with redundancy, and can be used for uninterruptible power supply with constant stabilized voltage to consumers of various radio-electronic objects from two independent DC lines.

State of the art

A redundant secondary power supply device from two independent DC lines is known from the prior art (RU 2754919 C1, published 09/08/2021), containing two circuit breakers, two contactors that provide connection to the main and backup networks, a service power source - the first auxiliary power source and charger with power supply from two facility networks - a second auxiliary power source, a capacitive storage device connected through a key device to one of the inputs of the diode adder, the other two inputs of which are connected to the outputs of the contactors for switching on the main and backup networks, and the output is connected to the centralized secondary power supply bus a number of DC/DC converters, each of which provides power supply to one of the responsible consumers, as well as voltage sensors of the main and backup networks and a control circuit that implements the algorithm for the necessary energy support of the centralized secondary power supply from the backup capacitive storage device during a pulse drop and decrease in the voltage of the main network, followed by switching to power supply from a backup network.

In addition, an RD circuit has been additionally introduced into the secondary power supply path, providing blocking of pulse overvoltages from the centralized power supply bus to the input of the capacitive storage device.

The disadvantages of this device are as follows:

- in the presence of DSM diodes, since a voltage drop occurs on them, which must be compensated, as well as a large heat generation at currents from 1 A;

- when switching between switches (3 and 4 in Fig. 2 analog), transient processes appear, since switching does not occur instantly;

- the function of uniform load distribution is not provided.

As the closest analogue, we selected a redundant secondary power supply device from two independent DC lines (US 6774507 B1, published on August 10, 2004), which includes two independent input power stages, each of which is connected to a separate primary winding of a common transformer, and an output power unit connected to the secondary winding of the transformer. The control circuitry controls how much power each of the input power train units supplies. Each of the input power stages is connected to a different battery power source or to a different power distribution bus. The advantages of complete duplication of the power supply are achieved by duplicating only the input power stages; they are isolated from each other by connecting to separate windings of the transformer.

The control circuit is controlled by a programmable controller, which is connected to the power control data link. This channel allows the controller to exchange data with similar devices also connected to this channel. Information exchanged between programmable controllers may indicate the desirability of drawing more power from the power distribution source. This includes the transmission of information such as alarm indication, indication that one or both power distribution sources are too high or too low voltage, temperature, output current, power outage.

The disadvantages of the prototype are as follows:

- both lines work on a common transformer, which leads to increased heating of the core, since the magnetization reversal of the core occurs in a full cycle, and not in a limiting partial cycle, uniform distribution of power consumption across the lines is difficult to implement;

- the generation of control pulses for transistors of power stages is carried out from separate PWM drivers (231,232), the controller only generates comparison voltages for PWM drivers;

- there is no backup capacitive storage with a separate power supply, therefore, when the System A and System B lines are turned off at the same time, the control circuit (220) is also turned off and cannot exchange information via the interface (244).

Disclosure of the invention

The problem to be solved by the invention is to create a redundant secondary power supply device from two independent DC power supply lines with small dimensions, devoid of the disadvantages of known analogues and a prototype, which has expanded operational and functional capabilities and ensures uniform distribution of power consumption from two independent power supply lines with simultaneous stabilization of the output voltage of the secondary power supply device.

The technical result of the present invention is to ensure uniform distribution of power consumption from two independent power supply lines with simultaneous stabilization of the output voltage of the secondary power supply device.

Additional technical results are the following:

- the ability to transmit information about the state of the secondary power supply device via the external interface and receive remote control commands via the same interface;

- providing the ability to generate commands for emergency termination of programs to external consumers when switching to power supply from a backup storage device;

- increasing the fault tolerance of the device during operation during emergency operation with voltage imbalance;

- reducing the dimensions of the device by reducing the total number of components;

- ensuring the possibility of power supply to external low-power consumers.

To achieve the technical result, a redundant secondary power supply device from two independent DC lines is proposed, containing the following:

- first (1) and second (2) inputs for connecting the main and backup DC power lines, respectively,

- first (3) and second (4) auxiliary power supplies, each of which is connected to said inputs (1, 2),

- backup capacitive storage (5) connected to auxiliary sources (3) and (4) and to output (11) for connecting the consumer,

- the first (6) power stage connected to the first input (1), and the second (7) power stage connected to the second input (2),

- the first (8) current sensor installed after the first power stage (6), and the second (9) current sensor installed after the second power stage (7),

- a control circuit (10) connected to auxiliary power supplies (3, 4), power stages (6, 7), current sensors (8, 9) and equipped with digital interfaces, as well as

- output (11) for connecting a consumer, connected to current sensors (8) and (9).

In this case, the first (3) auxiliary source is intended to provide power to the control circuit (10), the second (4) auxiliary source is intended to charge the backup capacitive storage (5) and backup power to the first auxiliary source (3). The backup capacitive storage device (5) is designed to supply power to the first auxiliary source (3) and to supply power via the output line (11) when the currents on the main and/or backup power supply lines are exceeded or when these lines are simultaneously disconnected. The control circuit (10) is designed to stabilize the output voltage and uniformly distribute power consumption from the main and backup power supply lines, includes a protection circuit against exceeding input currents (101), a driver (102) and a microcontroller (103), configured to generate the following control signals:

- digital signals to the driver (102) to control the operation of the transistors of the power stages (6, 7);

- a signal allowing or prohibiting the operation of the second (4) auxiliary power source;

- a signal that the microcontroller (103) is ready for operation, switching the protection circuit against exceeding input currents (101) into the current control mode, in which the circuit (101) allows the operation of the driver (102).

In the preferred embodiment c, the input overcurrent protection circuit (101) of the control circuit (10) is configured to:

- generating a reset signal for the microcontroller (103) in any of the following cases: when the device is turned on for the first time, when turned on after a simultaneous shutdown of the main and backup power supply lines, when the protection circuit (101) is triggered in case of excess currents on the main and/or backup line;

- generating a signal to prohibit the operation of the driver (102) in any of the following cases: when initializing the microcontroller program (103), when turning on after an emergency shutdown of the main and backup power supply lines, when the protection circuit (101) is triggered in case of excess currents in the main and/or backup line.

Also in the preferred embodiment, the driver (102) of the control circuit (10) is designed to control the operation of the transistors of the power stages (6, 7), by performing the logical AND function with a signal to prohibit operation from the input current protection circuit (101) and a signal coming from microcontroller (103).

And in the preferred embodiment, the microcontroller (103) of the control circuit (10) for the purpose of generating the mentioned control signals is configured to receive and process analog signals carrying the following information:

- voltage on the main power supply line;

- voltage on the backup power supply line;

- voltage at terminal (11) for connecting the consumer;

- voltage on the second (4) auxiliary power supply;

- current value based on the readings of the first current sensor (8);

- current value based on the readings of the second current sensor (9);

- temperature value at the measuring point by sensor (12),

and with the ability to receive and process the following digital control signals:

- an external signal that allows or prohibits the operation of the secondary power supply device, regardless of the interfaces;

- a signal coming from the protection circuit against exceeding input currents (101) in the event of its operation or upon initial switching on.

As a rule, the microcontroller (103) of the control circuit (10) includes a USART technological interface designed for firmware, changing settings, obtaining data on the operation of the microcontroller (103) at the production and commissioning stages, as well as an isolated USART interface intended for receiving remote control commands from an external digital control system and transmitting information about the state of the secondary power supply device.

Power stages (6, 7) can be designed to convert 27 V DC to 48 V DC.

The second (4) auxiliary power supply may be configured to convert 27 VDC to 47 VDC.

Thanks to the described component composition and structure of the redundant secondary power supply device and, in particular, the control circuit (10), as well as their operating capabilities, uniform distribution of power consumption from two independent power supply lines is ensured with simultaneous stabilization of the output voltage.

The device is configured in such a way that the mentioned uniform distribution of power consumption is ensured even with a voltage imbalance of 0.5 V.

Thanks to the external USART interface, it is possible to transmit information about the state of the proposed secondary power supply device and receive remote control commands.

The presence of a backup capacitive drive (5) in the described device circuit increases its fault tolerance and makes it possible to generate commands for emergency termination of programs to external consumers through external connectors when switching to power supply from the mentioned drive (5).

Due to the structure and capabilities of the control circuit (10), the fault tolerance of the device during operation increases during emergency operation with voltage imbalance, for example, due to the protection circuit against exceeding input currents (101), capable of turning off the transistors of the power stages (6, 7) by prohibiting operation drivers (102), preventing their failure.

Also, by reducing the total number of device components, its dimensions have been reduced.

Brief description of drawings

The invention is illustrated using FIGS. 1-5.

Figure 1 shows a diagram of a redundant secondary power supply device from two independent DC lines.

Figure 2 shows a block diagram of the control circuit of the proposed device.

Figure 3 shows a general block diagram of the operation algorithm of the invention.

Figure 4 shows a block diagram of the startup cycle algorithm of the invention.

Figure 5 shows a block diagram of an algorithm for uniform distribution of power consumption from two independent power supply lines with simultaneous stabilization of currents and voltages.

Carrying out the invention

1 to 5 illustrate the most preferred embodiment of the invention. A person skilled in the art will understand other possible embodiments of the invention by analogy with those presented in the present description.

A redundant secondary power supply device from two independent DC lines (Fig. 1) contains the first 1 and second 2 inputs for connecting the main and backup DC power supply lines, respectively, the first 3 and second 4 auxiliary power sources, a backup capacitive storage 5 in the form of a capacitor bank , the first 6 and second 7 power stages, the control circuit 10, the first 8 and second 9 current sensors, made in the form of resistors or any other known devices, and pin 11 for connecting the consumer.

Both auxiliary power supplies 3, 4 are connected to inputs 1, 2 for connecting the main and backup power supply lines and are built, as a rule, using SEPIC technology, but construction is possible using any known topology. The first auxiliary power supply 3 is connected to the control circuit 10 and provides power to its components, which allows, among other things, to control the transistors of the power stages 6, 7. The second auxiliary power supply 4 provides, via a separate line, the charge of the backup capacitive storage device 5 and the backup power supply to the first auxiliary source 3 .

Also, the first 3 auxiliary power supply can be implemented with the ability to convert 27 V DC voltage to 12 V DC voltage, and the second 4 auxiliary power supply can be implemented with the ability to convert 27 V DC voltage to 47 V DC voltage.

Backup capacitive storage 5 is connected to auxiliary sources 3, 4 and to output 11 for connecting the consumer and provides power supply to the first auxiliary source 3, as well as power supply through output line 11 while simultaneously turning off the main and backup power supply lines connected to the first 1 and second 2 inputs accordingly.

The first 6 power stage is connected to the first input 1, and the second 7 power stage is connected to the second input 2. Each stage, as a rule, consists of two single-ended forward DC/DC converters that operate in antiphase relative to each other and are capable of both increasing and and lower, for example, increase the voltage from 27 V to 48 V.

The control circuit 10 is explained with reference to FIG. 2. The control circuit 10 is connected to cascades 6, 7, auxiliary power supplies 3, 4 and current sensors 8, 9 installed after the power stages 6, 7, respectively, to transmit the values of their output currents to circuit 10.

Thus, the input of the first 8 current sensor is connected to the output of the first stage 6, and the first output of the current sensor 8 is connected to the input of the control circuit 10, the input of the second 9 current sensor is connected to the output of the second stage 7, and the first output of the current sensor 8 is connected to another input of the circuit control 10, while the second outputs of current sensors 8, 9 are connected to pin 11 for connecting a consumer.

The control circuit 10 (Fig. 2) is designed to stabilize the output voltage and uniformly distribute power consumption from the main and backup power supply lines and includes a protection circuit against exceeding input currents 101, a driver 102, a microcontroller 103 and additionally buffer repeaters 104 designed for impedance matching circuits of analog signals and input stages of the ADC (Fig. 2) of the microcontroller 103.

A temperature sensor 12 is connected to the control circuit 10, for example, in the form of a thermistor.

The input overcurrent protection circuit 101 is configured to:

- generating a reset signal for microcontroller 103 (Reset signal 103 in Fig. 2) in any of the following cases: when the device is initially turned on, when turned on after the simultaneous shutdown of the main and backup power supply lines, when circuit 101 is triggered in case of excess currents in the main and/or or backup line;

- generating a signal to prohibit the operation of the driver 102 in any of the following cases (signal Prohibition in Fig. 2): when initializing the program of the microcontroller 103, when turning on after the simultaneous shutdown of the main and backup power supply lines, when circuit 101 is triggered in case of excess currents in the main and/or or backup line.

In this case, the protection circuit 101 can be switched to current control mode only by a signal from the microcontroller 103 Reset protection (Fig. 2).

Typically, protection circuit 101 is implemented based on analog comparators and an RS trigger.

Driver 102 is designed to control the operation of transistors of power stages 6 and 7 (PWM signals 6 and PWM 7 in Fig. 2) by executing the logical function AND with a signal to prohibit operation from the protection circuit against exceeding input currents 101 and control signals for power transistors from the microcontroller timer unit 103 (Timer, signals Timer 1 and Timer 2 in Fig. 2). The driver 102 implements at the hardware level the function of prohibiting operation during the initialization of the microcontroller 103 firmware when the proposed device is initially turned on, turned on after a simultaneous emergency shutdown of the main and backup power supply lines, after circuit 101 is triggered when the currents on line 1 and/or line 2 are exceeded.

Microcontroller 103 (Fig. 1-2) is designed to form an algorithm for controlling the transistors of power stages 6 and 7 and provides them with corresponding digital control signals of pulse width modulation, these signals are obtained at the output of the timer block (signals Timer 1 and Timer 2 in Fig. 2). Microcontroller 103 also produces the following control signals:

- signal Charge (Fig. 2), allowing or prohibiting the operation of the second 4 auxiliary power source, which charges the backup capacitive storage device 5 and backup power supply to the first auxiliary source 3;

- Reset signal 101 (Fig. 2), signaling the readiness of the microcontroller 103 for operation, switching the protection circuit against exceeding input currents 101 into the current control mode, in which the circuit 101, in turn, allows the operation of the driver 102.

In order to generate the mentioned control signals, the microcontroller 103 is configured to receive and process analog signals carrying the following information:

- Voltage 1 - voltage on the main power supply line;

- Voltage 2 - voltage on the backup power supply line;

- Voltage 4 - voltage on the second auxiliary source 4;

- Voltage 11 - voltage at pin 11 for connecting the consumer;

- Current 8 - value of current consumption at the output of power stage 6 based on the readings of current sensor 8;

- Current 9 - value of current consumption at the output of power stage 7 based on the readings of current sensor 9;

- Terma. - temperature value at the measurement point by sensor 12.

These analog signals are supplied through buffer repeaters 104 to the input of the ADC multiplexer of the microcontroller 103 for further processing according to the algorithm.

Also, the microcontroller 103, in order to generate the mentioned control signals, is configured to receive and process the following digital control signals, which have the highest priority when processing the algorithm:

- ON/OFF - an external signal arriving through an external connector and allowing or prohibiting the operation of the secondary power supply device, regardless of the interfaces. This signal can come from any switching device, for example, a toggle switch;

- Reset 103 - the signal coming from the input overcurrent protection circuit 101 in the event of its operation or upon initial switching on.

In addition, the microcontroller 103, as a rule, includes a USART technology interface (Tech. USART), designed for programming, firmware, changing settings, obtaining data on the operation of the microcontroller 103 during the production and commissioning stages, as well as an isolated USART interface, designed for receiving commands remote control from an external digital control system (upper level controller), receiving service information and transmitting information about the state of the secondary power supply device. In this case, the package of information about the state of the device includes at least one of the following: voltage values on the lines, voltage value on the capacitor bank, output voltage value, current value along output line 11, device temperature at control point 12, alarm about exceeding load current, alarm about emergency excess or reduction of input voltage on the lines. Which specific data about the state of the device from the listed ones will be transmitted is determined by the connected control system.

However, both USART interfaces, technological and isolated, can be used to receive remote control commands, receive service information and transmit device status information, however, as a rule, only one of these interfaces is permanently connected.

In addition to the above signals, the microcontroller 103 is capable of generating other external information and control signals, such as external voltage converter control signals and other signals known in the art and obvious to one skilled in the art.

Also, in some embodiments, the control circuit 10 includes a 12 V line to enable power supply to external low-power consumers, such as display units.

Description of work

The general operating principle of the proposed device is illustrated using the block diagram shown in Fig. 3.

The bootloader (utility program block) allows programming of the microcontroller 103 via the USART technological interface.

After removing the reset signal (Reset signal 103 in Fig. 2) from the protection circuit against exceeding input currents 101 or connecting the power supply via line 1 and/or line 2, the peripherals and structures included in the microcontroller 103 are initialized.

Then the microcontroller 103 generates a readiness signal for the microcontroller 103 (Reset 101 in Figs. 2 and 3), which is input to the input overcurrent protection circuit 101.

If there is no prohibiting external signal on the ON/OFF line (ON/OFF in Figs. 2 and 3), received through an external connector, then the start cycle begins - the initial start mode.

A cycle of stabilization of currents and voltages is carried out - a mode of stabilization of the output voltage when operating from one input line and a mode of uniform distribution of power consumption and stabilization of the output voltage when the input voltages are unbalanced.

Next, the USART protocol is processed - the presence or absence of a command to prohibit operation via isolated or technological USART interfaces is checked, remote control commands are received from an external digital control system, service information is received and information about the device status is transmitted.

After which the cycle of stabilization of currents and voltages begins again, and so on.

Next, we consider the main operating modes of a secondary power supply device with redundancy according to the most preferred embodiment, namely:

1) initial launch mode;

2) output voltage stabilization mode when input voltages are unbalanced or operating from one input line, as well as a mode of uniform distribution of power consumption;

3) emergency modes:

- excess of the input current of the power stage;

- exceeding the output current of the power stage.

1) Initial launch mode.

When a voltage appears at power input 1 and/or 2 for connecting the main and backup power supply lines, for example, with a value in the range from 12 V to 40 V, the first auxiliary power source 3 is launched. After the output voltage of the auxiliary source 3 is established of a given level, the protection circuit against exceeding input currents 101 generates a signal to prohibit the operation of the driver 102 and reset the microcontroller 103 to prevent uncontrolled opening of the transistors of power stages 6 and 7 while the program is loaded from the built-in read-only memory (ROM) of the microcontroller 103. After loading the program, the microcontroller 103 executes sequence of actions in accordance with Fig.4.

Interaction with the device hardware is carried out as follows:

a) the input of the ADC channels of the microcontroller 103 through buffer amplifiers 104 (Fig. 2) receives analog signals carrying information about voltages, currents and temperatures in the device.

Processing occurs in the program block “Averaged data was received from the ADC for all channels” (Fig. 4);

b) processing of the received values via ADC channels occurs in program blocks (Fig. 4):

- the “Line activity check” block checks the voltage values on line 1 and line 2 for compliance with the specified range;

- block “Is the capacitor battery charged?” checks for compliance with the specified value the voltage at the output of the auxiliary source 4 (signal Voltage 4 in Fig. 2);

- block “Is the output voltage within normal limits?” checks the voltage at pin 11 for compliance with the specified value;

c) the “Load - ON” block can generate, for example, an enabling signal for an external converter through an external connector;

d) the block “Increasing PWM on active lines” increases the pulse width at the output of the timer block of the microcontroller 103 to control the transistors of the power stages 6, 7 through the driver 102;

e) the “Charge - ON” block generates an enabling signal along the Battery Charge line (Fig. 4), which is received by the second auxiliary source 4 to activate its operation (Fig. 1).

2) Uniform distribution of power consumption and stabilization of the output voltage when the input voltages are unbalanced on the main and backup lines are carried out as follows.

In this mode, microcontroller 103, in order to generate control signals, controls analog signals that carry information about:

- voltage at the first and second inputs 1 and 2;

- consumption currents at the outputs of the first and second power stages 6 and 7 based on the readings of the first and second current sensors 8 and 9, respectively;

- voltage at pin 11 for connecting a consumer.

During operation, the microcontroller 103 monitors the presence or absence of an external operation prohibition signal from an external on/off line (ON/OFF signal).

During operation, the microcontroller 103 transmits, upon request, via a technological or isolated USART interface to an external digital control system, the values of analog signals carrying information about voltages, currents and temperatures in the device, arriving at the input of the ADC of the microcontroller 103.

Also in this mode, microcontroller 103 receives digital control signals from an external digital control system via a technological or isolated USART interface.

Additionally, it should be noted that stabilization of the output voltage when operating from one input line is carried out similarly to the method described above, except that the microcontroller 103, in order to generate control signals, monitors analog signals only from this line, carrying information about the voltage at the corresponding input (1 or 2) and current consumption at the output of the corresponding first 6 or second 7 power stage.

To ensure stabilization of the output voltage when operating from both input lines, or from only one, and uniform distribution of power consumption, the microcontroller 103 performs an algorithm, the block diagram of which is presented in Fig.5. The control signals of the microcontroller 103 are supplied to the input of the driver 102 to amplify and distribute the signals to the transistors of the first and second power stages 6 and 7.

Thus, at the beginning and during operation, the microcontroller 103 monitors the presence or absence of an enabling signal via an external ON/OFF line (Fig. 5).

If there is no enabling signal (the value of the OFF signal on the external ON/OFF line), then microcontroller 103 generates a control signal to driver 102 in the “Turn off PWM on both lines” program block by switching the outputs of the timer block to the logical 0 state. Next, microcontroller 103 in the preferred embodiment implementation generates a message about turning off the secondary power supply device via USART interfaces to an external digital control system.

If there is an enabling signal, then analog signals are received through the ADC of microcontroller 103, carrying information about the voltages at inputs 1 and 2, about the current consumption at the outputs of power stages 6 and 7 based on the readings of current sensors 8 and 9, respectively, about the voltage at pin 11.

And the activity of the main and backup lines is checked by monitoring the voltages at inputs 1 and 2 for connecting the main and backup lines.

If both lines are active, then it is checked whether there is an excess current. If there is, the width of the control pulses of the transistors of power stages 6 and 7 decreases by a given step (block - “PWM reset”). Then the algorithm ends.

If there is no excess current, then it is checked whether the output voltage is within the normal range.

If not, the microcontroller 103 resets the current pull-up software flag and the voltages on the active lines increase by increasing the width of the control pulses of the transistors of power stages 6 and 7 by a given step.

If the voltage is within normal limits, then it is checked whether both lines - the main and backup - are active, and if they are not active, the algorithm ends. If active, then if the current difference is sufficient, a software flag is set for current tightening in microcontroller 103.

Next, it is checked whether the current boost software flag is set. If not set, the algorithm ends. If the flag is set, then it is checked whether the smaller current has begun to exceed the larger one. If it does not exceed, the smaller current is pulled up to the larger one by changing the width of the control pulses of the transistors of power stages 6 and 7 by a given step, and if it exceeds, the current pull-up software flag is reset and the algorithm ends.

It is this method that realizes the ability of control circuit 10 to stabilize the output voltage and uniformly distribute power consumption from the main and backup power supply lines when the voltage imbalance between inputs 1 and 2 is from 0.5 V.

3.1) Emergency mode: exceeding the input current of power stage 6 and/or 7.

In this mode, if the input currents of power stages 6 and/or 7 are exceeded, the protection circuit against exceeding input currents 101 generates a signal to prohibit the operation of the driver 102 with a constant level, a pulse reset signal of the microcontroller 103 (signal Reset 103) and generates an external Alarm signal for the connected consumer.

In this case, a transition occurs to the power supply from the backup capacitive storage device 5, which, by discharging through a diode, supplies power to the consumer on line 11 (Fig. 1).

After the end of the signal pulse Reset 103, loading the program from the internal ROM, initializing the peripherals and structures, the microcontroller 103 waits for a digital signal to turn on via a technological interface or an isolated USART from an external digital control system. The signal to transfer the protection circuit against exceeding input currents 101 to the current control mode is not generated. If there are no USART interface subscribers and there is no operation prohibition signal from the external on/off line (ON/OFF), the microcontroller 103 goes into the initial startup mode.

3.2) Emergency mode: excess output current at pin 11 for connecting an external consumer.

In this mode, when the output currents of power stages 6 and/or 7 are exceeded, the microcontroller 103 with a given step reduces the pulse width of the signals from which the control signals for the transistors of the power stages are formed, supplied to the input of the driver 102. When the minimum value of the pulse width of the control signals is reached, the microcontroller 103 sets at the driver input 102 there is a signal with a logical level “0”.

Also, microcontroller 103 generates an overload signal on line 11 via a connected technological or isolated USART interface to an external digital control system. In this case, a transition to power supply from the backup capacitive storage device 5 occurs, which supplies power to the consumer on line 11 until it is completely discharged through a diode (Fig. 1 ).

Resumption of device operation occurs in the presence of an enabling digital remote control signal received via the technological or isolated USART interface.

Thus, using the present invention the following is achieved:

- uniform distribution of power consumption from two independent power supply lines is ensured with simultaneous stabilization of the output voltage of the secondary power supply device, and uniform distribution of power consumption is ensured even with a voltage imbalance of 0.5 V;

- it is possible to transmit information about the state of the secondary power supply device via an external isolated interface and receive remote control commands via the same interface;

- increases the fault tolerance of the device during operation during emergency operation with voltage imbalance;

- the dimensions of the device are reduced by reducing the total number of components;

- it is possible to generate commands for emergency termination of programs to external consumers when switching to power supply from a backup storage device;

- the possibility of power supply to external low-power consumers is provided.

An example of the invention

To confirm the possibility of achieving a technical result and the stated advantages, a test sample was manufactured and tested, to which the following requirements were imposed on electrical parameters:

- the sample must provide reception and conversion of two redundant 27 V DC channels of the SE (power supply system);

- input influence parameters and input voltage range must comply with the requirements of GOST R 54073-2017 and MU-160-89;

- output voltage (48.8±1.0) V.

- the power consumed by the consumer via line 11, when powered from one channel of the SE (power supply system), must be at least 300 W.

Below are the resulting characteristics of the invention. Electrical characteristics:

Table 1

Characteristic name Meaning Conditions Minimum operating input voltage for main line 1 and backup line 2, V 18 - Maximum operating input voltage for main line 1 and backup line 2, V 36 - Emergency upper input voltage for line 1 and line 2, V 40 within 1 min Emergency low input voltage for line 1 and line 2, V 10 for 1 min, output voltage is not standardized Rated output voltage, V 48 ±1 - Rated voltage for charging a capacitor bank, V 47.0 ± 0.5 - Rated output voltage for power supply of auxiliary circuits, V 12.0 ± 0.2 at rated load Maximum current consumption by auxiliary circuits, A no more than 0.3 -

The following voltages were obtained at the output of the test sample depending on the input voltage:

Table 2

No. Line 1 input voltage, V Line 2 input voltage, V Sample output voltage, V 1 27.0±0.2 27.0±0.2 48.103 2 18.0±0.2 18.0±0.2 48.5 3 24.0±0.2 24.0±0.2 48.72 4 33.0±0.2 33.0±0.2 48.4 5 36.0±0.2 36.0±0.2 48.8 6 27.0±0.2 0 48.65 7 18.0±0.2 0 48.3 8 24.0±0.2 0 48.41 9 33.0±0.2 0 48.8 10 36.0±0.2 0 49.0 eleven 0 27.0±0.2 48.58 12 0 18.0±0.2 48.8 13 0 24.0±0.2 48.78 14 0 33.0±0.2 48.102 15 0 36.0±0.2 48.88

Thus, the possibility of operating a redundant secondary power supply device from two independent DC lines with the achievement of a technical result and the stated advantages has been confirmed.

From the above description it will be clear to a person skilled in the art that the invention is implemented by known methods and using known means.

Claims (32)

1. Redundant secondary power supply device from two independent DC lines, containing the first (1) and second (2) inputs for connecting the main and backup DC power lines, respectively, first (3) and second (4) auxiliary power supplies, each of which is connected to said inputs (1) and (2), backup capacitive storage (5) connected to auxiliary sources (3) and (4) and to output (11) for connecting a consumer, the first (6) power stage connected to the first input (1), and the second (7) power stage connected to the second input (2), the first (8) current sensor installed after the first power stage (6), and the second (9) current sensor installed after the second power stage (7), control circuit (10) connected to auxiliary power supplies (3, 4), power stages (6, 7), current sensors (8, 9) and equipped with digital interfaces, as well as output (11) for connecting a consumer, connected to current sensors (8, 9), wherein the first (3) auxiliary source is designed to provide power to the control circuit (10), the second (4) auxiliary source is intended to charge the backup capacitive storage (5) and backup power to the first auxiliary source (3), backup capacitive storage (5) is designed to power the first auxiliary source (3) and supply power via the output line (11) when currents on the main and/or backup power supply lines are exceeded or when these lines are simultaneously disconnected, and the control circuit (10) is designed to stabilize the output voltage and uniformly distribute power consumption from the main and backup power supply lines, includes a protection circuit against exceeding input currents (101), a driver (102) and a microcontroller (103), configured to generate the following control signals: – digital signals to the driver (102) to control the operation of the transistors of the power stages (6, 7); – a signal allowing or prohibiting the operation of the second (4) auxiliary power source; – the microcontroller (103) readiness signal for operation, which switches the protection circuit against exceeding input currents (101) into the current control mode, in which the circuit (101) allows the driver (102) to operate. 2. The device according to claim 1, in which the overcurrent protection circuit (101) of the control circuit (10) is configured to do the following: – generation of a reset signal for the microcontroller (103) in any of the following cases: when the device is turned on for the first time, when turned on after a simultaneous shutdown of the main and backup power supply lines, when the protection circuit (101) is triggered in case of excess currents on the main and/or backup line; – generating a signal to prohibit the operation of the driver (102) in any of the following cases: when initializing the microcontroller program (103), when turning on after an emergency shutdown of the main and backup power supply lines, when the protection circuit (101) is triggered in case of excess currents on the main and/or backup line. 3. The device according to claim 1, in which the driver (102) of the control circuit (10) is designed to control the operation of the transistors of the power stages (6, 7) by performing the logical function AND with an operation prohibition signal from the protection circuit against exceeding input currents (101) and a signal coming from the microcontroller (103). 4. The device according to claim 1, in which the microcontroller (103) of the control circuit (10) for the purpose of generating said control signals is configured to receive and process analog signals carrying the following information: – voltage on the main power supply line; – voltage on the backup power supply line; – voltage at terminal (11) for connecting the consumer; – voltage on the second (4) auxiliary power supply; – current value based on the readings of the first current sensor (8); – current value based on the readings of the second current sensor (9); – temperature value at the point of measurement by sensor (12), and with the ability to receive and process the following digital control signals: – an external signal that allows or prohibits the operation of the secondary power supply device, regardless of the interfaces; – a signal coming from the input overcurrent protection circuit (101) in the event of its operation or upon initial switching on. 5. The device according to claim 1, in which the microcontroller (103) of the control circuit (10) includes a USART technological interface intended for firmware, changing settings, obtaining data on the operation of the microcontroller (103) at the stages of production and commissioning, as well as an isolated USART interface , designed to receive remote control commands from an external digital control system and transmit information about the state of the secondary power supply device. 6. The device according to claim 1, in which the power stages (6, 7) are designed to convert a DC voltage of 27 V to a DC voltage of 48 V. 7. The device according to claim 1, wherein the second (4) auxiliary power supply is configured to convert 27V DC voltage to 47V DC voltage.