RU182060U1 - Power distribution module - Google Patents

Abstract

Declared as a utility model, the power distribution module relates to electronic switching equipment and is designed to determine the difference between the charge current of the capacitive load from the short circuit current.

The technical result is to reduce power consumption and increase the speed of protection elements.

The essence of the utility model is that a circuit for quickly determining the presence of a capacitive load is introduced into the composition of each switching channel of the power switch of the power distribution module.

The power distribution module comprises an output and input voltage sensor, a current sensor, a temperature sensor, an electronic power switch connected to the microprocessor and a power switch by an information control bus. It also contains a load connection control circuit consisting of: a power source, a current sensor, a key, a resistor, a diode, which is connected to the output of the power switch.

Declared as a utility model, the power distribution module can increase reliability by 15-25%, reduce the number of electrical elements by 3 times, reduce power consumption by 2 times and increase speed by 20-45%.

Description

Declared as a utility model, the power distribution module relates to electronic switching equipment and is designed to determine the difference between the charge current of the capacitive load from the short circuit current.

A known DC power distribution module consisting of a power supply bus and a semiconductor switch control controller that provides connection of the load to the power bus (patent US 20110221404).

The disadvantage of this technical solution is the low reliability.

This is due to the fact that the known power distribution module has a long time to determine the situation: short circuit or large capacitive load. Capacitive load occurs due to the fact that when switching the power supply voltage to the capacitive load with a power switch (the input capacitance of electronic power supplies can be several thousand microfarads), an inrush of current exceeds the operating current by tens of times. At the same time, its recession can be hundreds of milliseconds, which can lead to a false response of the protection or increase the likelihood of failure of the electronic power switch.

The objective of the utility model is to increase the reliability of the power distribution module.

The technical result is to reduce power consumption and increase the speed of protection elements.

This is achieved due to the fact that a circuit for quickly determining the presence of a capacitive load is introduced into the composition of each switching channel of a power key of a power distribution module (MREP).

It is also achieved due to the fact that the power distribution module contains an output and input voltage sensor, a current sensor, a temperature sensor, an electronic power switch connected to the microprocessor and a power switch by an information control bus. A load connection control circuit has also been introduced, consisting of: a power source, a current sensor, a key, a resistor, a diode, which is connected to the output of the power switch.

Declared as a utility model, the power distribution module is illustrated by drawings.

In FIG. 1 shows a block diagram of a power distribution module, consisting of the following nodes:

1 - electronic power switch

2 - current sensor;

3 - voltage sensor at the input of the switch;

4 - temperature sensor power key;

5 - control circuits and hardware short circuit protection;

6 - voltage sensor at the output of the switch;

7 is a diagram for monitoring the absence of short circuit (short circuit) with capacitive load and a circuit for monitoring the connection of the load to the electronic power switch (without turning it on);

8 - microprocessor main MP-1;

9 - microprocessor duplicating MP-2;

10 - elements 1, 2, 3, 4, 5, 6, 7, 11, 12, 13, 14, 15 from the 2nd to the 8th channel.

In FIG. 2 shows a block diagram (7) of monitoring the load connection to the key (without turning it on) and monitoring the absence of a short circuit of the load circuit consisting of the following nodes:

11 - galvanically isolated power supply voltage +5 V;

12 - current sensor;

13 - key for switching the test voltage;

14 - resistor;

15 - diode;

The power distribution module operates as follows.

In the MREP module, the microprocessor of the main MP-1 (8) and the microprocessor backup MP-2 (9), when applying the supply voltage, carry out a test program for monitoring the equipment.

At the end of the monitoring program, the microprocessors of the main MP-1 (8) and the backup MP-2 (9) transmit the results via the CAN-1 and CAN-2 interfaces.

If errors occur during the execution of the test program, further operation of the module is blocked.

Management and control of the channels in the power distribution module is carried out by the microprocessors of the main MP-1 (8) and the backup MP-2 (9) according to the relevant programs.

When commands for managing electronic keys of all channels are received via CAN-1 and / or CAN-2 interfaces, microprocessors of the main MP-1 (8) and backup MP-2 (9) implement an on / off algorithm for each channel, depending on the type of loads ( resistive, inductive or capacitive) connected to the outputs of electronic power switches.

In the event of emergency overloads in each channel, the protective functions are tripled: software - microprocessor main MP-1 (8), duplicating microprocessor MP-2 (9) and the control circuit and hardware short circuit protection (5).

This distribution of protective functions between the software and hardware of the power distribution module allows you to optimize the number of radio products (ERI), reduce power consumption, increase the speed and reliability of the protection elements.

When the +27 V voltage is switched by electronic power switch (1) to a capacitive load, a current surge occurs in the circuit, exceeding several times the permissible operating current. To prevent false triggering of the control circuit and hardware protection against short circuit (5), a control circuit for the absence of a short circuit in the load circuit (7) is used.

The main microprocessor MP-1 (8) and the backup microprocessor MP-2 (9) analyze the information received from the current sensor (12) and block the operation of the hardware protection circuit for 1-3 ms.

If the voltage at the load begins to grow rapidly, then when the magnitude of the order of SW reaches, the diode (15) closes, and the current sensor (12) provides information to the main microprocessor MP-1 (8) and to the microprocessor duplicating MP-2 (9) about the absence of current in the current sensor circuit (12). This determines the presence of a large capacity and the absence of a short circuit in the load circuit.

Information on the presence of voltage at the input and output of the electronic power switch (1), no more than 80 ms after it is turned on, is provided by voltage sensors at the input of the switch (3) and at the output of the switch (6).

Further operation of the electronic power switch (1) is determined by the program of operation of the microprocessor of the main MP-1 (8) or the microprocessor of the backup MP-2 (9).

In the event of a short circuit in the load circuit, the current sensor (12) continues to provide information on the presence of current and the main MP-1 microprocessor (8) or the backup MP-2 microprocessor (9) issue a command to turn off the electronic power switch (1) and unlock the circuit control and hardware short circuit protection (5).

When the control circuit and hardware protection against short circuit are triggered, further operation of the channel is blocked, and information about this is transmitted from the power distribution module via CAN-1, CAN-2 interfaces to an external control module.

In the MREP modules, information about the operation of protection and blocking the operation of the channel is recorded in non-volatile memory, which is part of the microprocessor of the main MP-1 (8) and the microprocessor of the backup MP-2 (9). Unlocking blocked channels is carried out only programmatically via CAN-1 or CAN-2 interfaces.

Another function is performed by circuit (7) - it is to monitor the integrity of the load connection circuit to the output of the electronic power switch (1) and the current sensor (2) (without turning on the electronic power switch).

Scheme (7) works as follows (see Fig. 2)

Before turning on the electronic power switch (1) (see Fig. 1), the switch for switching the test voltage (13) and the voltage from the power supply + 5 V (11) through the current sensor (12), resistor (14) and diode (15) are turned on ) is supplied to the load.

The current sensor (12) detects the flow of micro current (3 -: - 5 mA) through the circuit and thereby determines its integrity.

The operation of elements 1, 2, 3, 4, 5, 6, 7, 11, 12, 13, 14, 15 in the first channel is similar to their work in channels 2 -: - 8 (10).

The distribution of protective functions between the main microprocessor software MP-1 (8), the duplicating microprocessor MP-2 (9) and the control circuit and hardware short-circuit protection (5) can improve the reliability of the power distribution module by 15-25%.

Declared as a utility model, the power distribution module allows one microprocessor to simultaneously control up to 16 switching channels for a short circuit or capacitive load, which allows to reduce the number of electro-radio elements by 3 times.

It also allows you to reduce power consumption by 2 times and increase speed by 20-45%. This is due to the fact that it is not necessary to install a microprocessor in each switching channel with the appropriate strapping to ensure high performance.

Claims (1)

A power distribution module comprising an output and input voltage sensor, a current sensor, a temperature sensor, a power switch connected to the control information bus with a microprocessor, characterized in that a capacitive load detection circuit is introduced, the input of which is connected to the output of the current sensor and the voltage sensor input to the key output, and the output is connected to the main and backup microprocessors, containing a galvanically isolated power source connected to the input of the current sensor, the output of which is connected to the input of the switching key, the output of which is connected to a resistor, connected to a diode, the output of which is connected to the output of the current sensor and the input of the voltage sensor at the output of the key.

Images