WO2016045559A1

WO2016045559A1 - Power supply system supporting redundancy backup and hot plugging

Info

Publication number: WO2016045559A1
Application number: PCT/CN2015/090118
Authority: WO
Inventors: 吴新祥
Original assignee: 邦彦技术股份有限公司
Priority date: 2014-09-22
Filing date: 2015-09-21
Publication date: 2016-03-31
Also published as: CN104319870B; CN104319870A

Abstract

A power supply system supporting redundancy backup and hot plugging comprises at least two power supply systems. Each power supply system comprises a power supply unit (1), a first control switch (2), a second control switch (3), a first controllable switch driving unit (5), a second control switch driving unit (8), a voltage comparison unit (4), a first sampling unit (6), and a second sampling unit (7). Under the condition that the power supply system is not current-shared, power supply switching can be carried out automatically, and a redundancy backup function can be achieved; and hot plugging is carried out without spark or power cut, and no other auxiliary connecting line is needed except the connection of two output voltages between the power supply systems. Power supply system switching is actively implemented by the power supply system itself, no external monitoring system is needed, and true redundancy and backup functions are achieved.

Description

Power supply system supporting redundant backup and hot swap

Technical field

The present invention relates to a redundant power supply, and more particularly to a power supply system that supports redundant backup and hot swap.

Background technique

At present, in the MT (MicroTCA: Micro Telecommunications Computing Architecture) platform or AT (ATCA: Advanced Telecom Computing Platform) platform, products in the military products market use dual power supply systems to achieve redundant backup, thereby improving The purpose of the reliability of the product, however, the currently commonly used method is implemented by the method of current sharing. FIG. 1 is a schematic structural diagram of a dual power supply system in the prior art, as shown in FIG. The board and the back board are powered by a power supply 1 and a power supply. Two power supply systems are used to implement redundancy backup. The main drawback of this method is that each power supply system must have a current sharing function, but currently, there are quite a few on the market. Many power systems do not have a current sharing function; without this function, redundant backups cannot be realized; and, as a result of the current sharing function, both modules are working with load, and such results can only be redundant. Other functions, however, can not achieve the backup function; also, this implementation, if the hot swap is implemented, it is easy to generate sparking phenomenon, because the current MT and AT equipment, working electricity Relatively large, typically 48V DC power supply section, or more generally to achieve 5A; if in operation, a sudden pluggable, it is prone to ignition phenomena.

Another technique is to add a monitoring system. The drawback of this method is that the system is complicated to implement. The power switching of the dual power system is not realized by the power system itself, but by the passive switching of the monitoring system.

Summary of the invention

In order to solve the above technical problems, an object of the present invention is to provide a power supply system that supports redundant backup and hot swap.

The technical solution adopted by the present invention is: a power supply system supporting redundancy backup and hot swap, comprising at least two power supply systems, the power supply system comprising:

Power supply unit: it is used to generate a working voltage;

a first control switch: the output for controlling the operating voltage of the power supply unit;

a second control switch: located between the first control switch and the load line for separating the voltage on the load line from the voltage of the power supply unit;

a first controllable switch drive unit: configured to control an open and close state of the first control switch;

a second control switch driving unit: configured to control opening and closing of the second control switch;

a voltage comparison unit: configured to compare a voltage generated by the power supply unit with a load voltage to output a switch opening and closing control voltage to the first control switch driving unit, and drive the first control switch driving unit output signal to control the first control switch Closed state

The first sampling unit is configured to: when the power supply unit has a voltage output, output a sampling voltage from the output voltage of the power supply unit to the first control switch driving unit, and drive the first control switch driving unit to send a signal to lock the first control. The on state of the switch;

The second sampling unit is configured to output a sampling voltage from the output voltage of the power supply unit to the second control switch driving unit, and drive the second control switch driving unit to send a signal to control the conduction state of the second control switch.

Preferably, the first control switch driving unit comprises: an OR gate circuit and a driving circuit, the OR gate circuit is configured to open and close a control voltage of the first control switch output by the voltage comparison unit and the first sampling The sampling voltage outputted by the unit is ORed; the driving circuit outputs a signal to the first control switch according to the OR operation result, and controls the opening and closing state of the first control switch.

Preferably, the voltage comparison unit includes a comparator; the non-inverting input terminal of the comparator is connected to the power supply unit through a resistor, and is connected to the ground potential through a resistor;

The inverting input of the comparator is connected to the load through a resistor and is connected to the ground potential through a resistor.

Preferably, the first sampling unit is a sampling resistor.

Preferably, the OR gate circuit of the first control switch driving unit includes a common cathode diode; the driving circuit of the first control switch driving unit includes an NPN transistor; and two bases of the common cathode diode and the voltage respectively a comparison unit, a first sampling unit is connected; an emitter of the double diode is connected to a base of the NPN transistor; an emitter of the NPN transistor is connected to a ground potential; and a collector of the NPN transistor passes through a resistor and the The first control switch is connected.

Preferably, the first control switch unit includes: a PMOS switch tube; a source and a drain of the PMOS switch tube are connected through a resistor; a gate of the PMOS switch tube is driven by the first control switch a unit is connected; a source of the PMOS switch tube is connected to the power supply unit, and a drain of the PMOS switch tube is connected to a load.

Preferably, the second sampling unit is a sampling resistor.

Preferably, the second control switch driving unit includes an NPN transistor; a base of the NPN transistor is connected to the second sampling unit; and a collector of the NPN transistor is connected to the second control switch unit through a resistor; The base and emitter of the NPN transistor are connected by a resistor; the emitter of the NPN transistor is connected to a ground potential.

Preferably, the second control switch unit includes: a PMOS switch tube, a source of the PMOS switch tube is connected to a load, and a drain of the PMOS switch tube is the first control switch unit;

a gate of the PMOS switch is connected to the second control switch driving unit; a source and a gate of the PMOS switch are connected through a resistor; and a drain and a gate of the PMOS switch are connected A diode is connected in series; a cathode of the diode is connected to a drain of the PMOS switch, and a cathode thereof is connected to a gate of the PMOS switch through a resistor.

The utility model has the beneficial effects that the power supply system supporting the redundant backup and hot plugging comprises at least two power supply systems, and the power supply system can automatically switch the power supply when the power supply system has no current sharing. To achieve redundant backup function; and during hot plugging, no ignition, no power, no other auxiliary connecting lines between the power supply system except the two output voltages. In addition, the present invention is provided with a redundant backup and hot swap circuit between the relevant DC power supply system and the load, and the switching of the power supply system is actively implemented by the power system itself, without the need for an external monitoring system, realizing redundancy and Backup function.

DRAWINGS

The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings:

1 is a schematic structural view of a dual power supply system in the prior art;

2 is a schematic structural diagram of a power supply system according to the present invention;

3 is a schematic structural diagram of a circuit of a specific embodiment of a power supply system according to the present invention;

FIG. 4 is a schematic structural diagram of a specific embodiment of a power supply system supporting redundancy backup and hot swap according to the present invention.

detailed description

The principles and features of the present invention are described in the following with reference to the accompanying drawings.

The invention provides a power supply system supporting redundant backup and hot swap, and includes at least two power supply systems. FIG. 2 is a structural block diagram of a power supply system supporting redundant backup and hot swap, as shown in FIG. The power supply module includes: a power supply unit 1, a first control switch 2, a second control switch 3, a first controllable switch drive unit 5, a second control switch drive unit 8, a voltage comparison unit 4, a first sampling unit 6, and a Two sampling unit 7.

Wherein, the power supply unit 1 is used to generate an operating voltage;

The first control switch 2 is a main voltage control circuit, mainly for controlling an output of a working voltage of the power supply unit;

The second control switch 3 is located between the first control switch 3 and the load line for separating the voltage on the load line from the power supply unit voltage for related redundancy backup and hot plug function processing;

The first control switch driving unit 5 is configured to control an open and close state of the first control switch;

The second control switch driving unit 8 is configured to control the opening and closing of the second control switch;

The voltage comparison unit 4 is configured to compare the load line voltage with the power supply unit voltage, and then output the compared result to the first control switch driving unit 5 to control the opening and closing state of the first control switch 2;

The first sampling unit 6 is configured to sample whether the power supply unit 1 has a voltage output. When the power supply unit 1 has a voltage output, the sampling voltage is output from the output voltage of the power supply unit 1 to the first control switch driving unit 5, Driving the first control switch drive unit 5 sends a signal to lock the first control switch 2 so that it is always in the on state.

The first control switch driving unit 5 is configured to control the opening and closing state of the first control switch 2, and includes: an OR circuit 501 and a driving circuit 502; or a gate circuit 501 for the first control switch outputted by the voltage comparing unit 4 The opening and closing control voltage and the sampling voltage outputted by the first sampling unit 6 are ORed. The driving circuit 502 outputs a signal to the first control switch 2 according to the OR operation result, and controls the opening and closing state of the first control switch 2. .

The second sampling unit 7 is configured to sample whether the power supply unit 1 has a voltage output. When the power supply unit 1 has a voltage output, the sampling voltage is output from the output voltage of the power supply unit 1 to the second control switch driving unit 8 to drive The second control switch drive unit 8 sends a signal to control the conduction state of the second control switch 3.

3 is a schematic structural diagram of a circuit of a power supply system according to the present invention, as shown in FIG. 3: in the embodiment, the voltage comparison unit 4 is implemented by a comparator U1; and the OR circuit 501 is implemented by a common cathode diode D1; The driving circuit 502 is driven by the NPN transistor Q3; the first sampling unit 6 uses a sampling resistor R7 for voltage sampling; the second sampling unit uses a sampling resistor R8 for voltage sampling; and the second driving unit 8 uses NPN transistor Q4 for driving; A control switch 2 uses a PMOS switch tube Q1 to implement the control switch; the second control switch 3 uses a PMOS switch tube Q2 to implement the control switch.

The specific circuit structure connection relationship of the power supply system in the present invention will be described below with reference to FIG. 3:

In the present embodiment, a DC 48V power supply is taken as an example, and other voltages are the same as the principles of the present invention, and will not be further described herein.

The inverting input terminal of the comparator U1 is connected to the load line through a resistor R1, that is, the +48VOUT network, and is connected to the ground potential through a resistor R4; the non-inverting input terminal of the comparator U1 is connected to the power supply unit 1 through a resistor R3 (ie +48V), connected to the ground potential through a resistor R4.

The two anodes of the common cathode diode D1 are respectively connected to the output end of the comparator U1 and one end of the sampling resistor R7, and the output end of the common cathode diode D1 is connected to the base of the NPN transistor Q3;

The emitter of the NPN transistor Q3 is connected to the ground potential, and the collector of the NPN transistor Q3 is connected to the gate of the PMOS switch transistor Q1 of the first control switch 2 via a resistor R6.

The source of the PMOS switch Q1 is connected to the power supply system 1, the source and the gate of the PMOS switch are connected through a resistor R5, and the drain of the PMOS switch Q1 is connected to the PMOS switch Q2 in the second control switch 3. The drain is connected to the other end of the resistor R7 in the first sampling unit 6.

The source of the PMOS switch Q2 in the second control switch 3 is connected to the load; the source and the gate of the PMOS switch Q2 are connected through a resistor R10, and the drain and the gate of the PMOS switch Q2 are connected in series. Diode D5; the anode of diode D5 is connected to the drain of PMOS switch Q2, and the cathode of diode D5 is connected to the gate of PMOS switch Q3 through a resistor R9.

One end of the sampling resistor R8 is connected to the drain of the PMOS switch transistor Q2, and the other end is connected to the base of the NPN transistor Q3 in the second driving unit 8. The base and the emitter of the NPN transistor Q4 are connected through a resistor R11; the NPN transistor Q4 The emitter is connected to the ground potential; the emitter of the NPN transistor Q4 is connected to the gate of the PMOS switch Q2 through a resistor R12.

In this embodiment, it is assumed that the normal output voltage range is 42-54V, and the voltage comparator U1 has a threshold voltage of 44V, that is, below 44V, indicating load undervoltage; assuming 44*R2/(R1+R2)= 48*R4/(R3+R4), then, according to the principle of the voltage comparator, when the voltage of the load line is lower than 44V, the comparator U1 outputs a high level, and when it is higher than 44v, the comparator U1 outputs a low level. Because, those skilled in the art know that when the PMOS switch tube is G extremely low level, the PMOS switch tube is turned on, and when G is at a high level, the PMOS switch tube is turned off, and the common cathode diode is as long as one anode has high power. Ping, then the output is high, NPN type transistor is, high level conduction, low level is absolutely closed; so the implementation principle of the above circuit, not explained here.

At present, in the AT or MT platform, the power supply system is required to have redundant backup and hot plugging functions, that is, when one power supply system is working, another power supply system is in standby state, once the working power supply system fails. The redundant power supply can supply power in time; in addition, in the event of a power supply system failure, in the case of continuous power, it is necessary to be able to insert and replace the power supply system that has failed from the AT or MT platform. Ok, at this time, there can be no power outage, which is what the hot plug function is.

4 is a schematic structural diagram of a power supply system supporting redundancy backup and hot swap according to the present invention. The specific implementation process of the redundancy backup and hot swap function of the present invention will be described below with reference to FIG. 4 . As shown in FIG. 4, in the power supply system of the embodiment, two power supply systems are used to supply power to the device. In fact, two or more voltage power supply modules can be used to supply power to the device. The principle is the same as that in this embodiment. I will not repeat them here. The following describes the implementation process of implementing redundancy backup and hot swap using two power supply systems.

In the present embodiment, it is assumed that the power supply system 1 first powers up the load, and the power supply system 2 is powered on.

When the power supply system 1 is powered on, the comparator U1 of the power supply system 1 checks that the load voltage is not, or is lower than the normal operating voltage. At this time, the comparator U1 outputs a high level, and the high level passes the OR gate. The circuit 501, or the gate circuit 501 outputs a high level, and when the high level is applied to the driving circuit 502, the driving circuit 502 outputs a high level to the first control switch 1, and turns on the first control switch 2 to place the circuit in The ON state; once the first control switch 2 is in the ON state, the first sampling unit 6 outputs a high level, and the high level is input to the OR circuit 501, and the first control switch 2 is locked. At this time, the second sampling unit 7 also outputs a high level to the second driving unit 8, and the second driving unit 8 will output a high level to the second control switch 3, and the second control switch 3 is turned on. And locking the on state of the second control switch 3, from the purpose of reaching the power supply system of the power supply.

When the power supply system 2 is powered on, first, the comparator U1 of the power supply system 2 compares the voltage generated by the power supply unit 1 with the voltage on the load line, and if the load voltage is within the normal operating voltage range, the comparator U1 outputs a low level, because the other output port of the OR circuit 501 is in the initial state, and is also low level, that is, the OR circuit 501 outputs a low level to the driving circuit 502, thereby controlling the first control switch 2 to be off. The open state, in this way, the power supply system 2 is disconnected from the load.

Assume that during the working process, when the power supply system 1 in the working state fails, there is no voltage output. At this time, the standby power supply system 2 immediately detects that the line voltage is lower than the normal working voltage, and the power supply system 2 The comparator U1 outputs a high level, and the high level passes through the OR circuit 501. Since the OR circuit 501 only has a high level, that is, outputs a high level, when the high level is applied to the driving circuit 502, The driving circuit 502 will output a high level to the first control switch 2, and turn on the first control switch 2 to make the circuit in an on state; once the first control switch 2 is in the on state, the first sampling unit 6 will The output is a high level, and the high level is input to the OR circuit 501, and the first control switch 2 is always turned on; at this time, the second sampling unit 7 also outputs a high level to the second drive. Unit 8, the second driving unit 8 will output a high level to the second control switch 3, turn on the second control switch 3, and lock the on state of the second control switch 3, thereby achieving redundancy backup, automatic The purpose of the switch.

The specific implementation process of the present invention will be further described by taking the hot-drawing process of the power supply system 1 as an example with reference to FIG.

If the power supply system 1 and the power supply system 2 are plugged into the device and powered on,

1) When the power supply system 1 is working, if the power supply system 1 is dialed out: because the power supply system 1 is not disconnected immediately when it is dialed out, at the same time, there will be an energy storage filter device inside the power supply system. Generally, the capacitor is used for energy storage and filtering; then, at the moment when the power supply device is disconnected, because the voltage of the energy storage device on the load line does not immediately drop to 0V, but slowly decreases, once on the load line The voltage drops outside the operating voltage range. At this time, the comparator U1 of the power supply system 2 immediately detects that the line voltage is lower than the normal operating voltage, and immediately outputs a high level, thereby turning on the first control switch 2, Second, the switch 3 is controlled because the power supply system 2 detects that the voltage drops outside the operating voltage range, and the time to turn on the first control switch 2 and the second control switch 3 is much shorter than the discharge of the capacitor to the normal operating voltage. Outside time, therefore, there will be no power outage on the line. At the same time, the voltage on the energy storage circuit does not fall below the voltage at which the spark is generated, and the power supply has been restored. In, there will be no spark occurs.

2) When the power supply system 1 is in the standby state, the power supply system 2 is working, at this time, the power supply system 1 is dialed out from the platform, because the power supply 1 itself is in the standby state, then according to the redundancy backup The principle is that the load line is isolated from the power supply unit of the power supply system 1 itself, so the power supply system 1 is removed from the platform device at this time, and the line will not have any influence.

Since the circuit of the power supply system 2 and the circuit of the power supply system 1 are identical and the implementation principle is the same, the hot-dial process of the power supply system 2 is the same as that of the power supply module 1, that is, the power is not turned off and generated. spark.

The hot plug process of the power supply system will be further described below with reference to FIG.

Assume that the power supply system 1 has been plugged into the platform device, and it is working, indicating that there is power on the load line; at this time, if the power supply system 2 is plugged in, because the power supply system 2 supplies power to the load, the load is checked first. The voltage on the line, if there is a normal working voltage on the load line, the power supply system 2 will not have any voltage output, and it is in the standby state, so it will not have any influence on the load power during the hot plug process.

Similarly, if the power supply system 2 is plugged into the platform device, and then the power supply system 1 is plugged in, because the implementation principle and circuit of the two power supply devices are identical, so when the power supply system 1 is plugged in, Any impact on the load power supply.

The above is a detailed description of the preferred embodiments of the present invention, but the present invention is not limited to the embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the invention. Such equivalent modifications or alternatives are intended to be included within the scope of the claims.

Claims

A power supply system supporting redundant backup and hot swap, characterized in that it comprises at least two power supply systems, the power supply system comprising:

Power supply unit: it is used to generate a working voltage;

a first control switch: the output for controlling the operating voltage of the power supply unit;

a second control switch: located between the first control switch and the load line for separating the voltage on the load line from the voltage of the power supply unit;

a first controllable switch drive unit: configured to control an open and close state of the first control switch;

a second control switch driving unit: configured to control opening and closing of the second control switch;

a voltage comparison unit: configured to compare a voltage generated by the power supply unit with a load voltage to output a switch opening and closing control voltage to the first control switch driving unit, and drive the first control switch driving unit output signal to control the first control switch Closed state

The first sampling unit is configured to: when the power supply unit has a voltage output, output a sampling voltage from the output voltage of the power supply unit to the first control switch driving unit, and drive the first control switch driving unit to send a signal to lock the first control. The on state of the switch;

The second sampling unit is configured to output a sampling voltage from the output voltage of the power supply unit to the second control switch driving unit, and drive the second control switch driving unit to send a signal to control the conduction state of the second control switch.
The power supply system supporting redundant backup and hot swap according to claim 1, wherein the first control switch driving unit comprises: an OR circuit and a driving circuit, and the OR circuit is used for The opening and closing control voltage of the first control switch outputted by the voltage comparison unit and the sampling voltage output by the first sampling unit are ORed;

The driving circuit outputs a signal to the first control switch according to the OR operation result, and controls an opening and closing state of the first control switch.
The power supply system supporting redundancy backup and hot swap according to claim 1 or 2, wherein the voltage comparison unit comprises a comparator;

The non-inverting input terminal of the comparator is connected to the power supply unit through a resistor, and is connected to the ground potential through a resistor;

The inverting input of the comparator is connected to the load through a resistor and is connected to the ground potential through a resistor.
A power supply system supporting redundant backup and hot swap according to claim 1 or 2, wherein the first sampling unit is a sampling resistor.
A power supply system supporting redundant backup and hot swap according to claim 3, wherein:

The OR gate circuit of the first control switch driving unit includes a common cathode diode;

The driving circuit of the first control switch driving unit includes an NPN transistor;

The two bases of the common cathode diode are respectively connected to the voltage comparison unit and the first sampling unit;

The emitter of the dual diode is connected to the base of the NPN transistor;

The emitter of the NPN transistor is connected to a ground potential;

The collector of the NPN transistor is connected to the first control switch through a resistor.
The power supply system supporting redundant backup and hot swap according to claim 1 or 2, wherein the first control switch unit comprises: a PMOS switch tube;

The source and the drain of the PMOS switch are connected by a resistor;

a gate of the PMOS switch tube is connected to the first control switch driving unit;

The source of the PMOS switch is connected to the power supply unit, and the drain of the PMOS switch is connected to the load.
A power supply system supporting redundant backup and hot swap according to claim 1 or 2, wherein the second sampling unit is a sampling resistor.
The dual power supply system for implementing redundant backup according to claim 1 or 2, wherein the second control switch driving unit comprises an NPN transistor;

The base of the NPN transistor is connected to the second sampling unit;

The collector of the NPN transistor is connected to the second control switch unit through a resistor;

The base and the emitter of the NPN transistor are connected by a resistor;

The emitter of the NPN transistor is connected to a ground potential.
The power supply system supporting redundant backup and hot swap according to claim 1 or 2, wherein the second control switch unit comprises: a PMOS switch tube,

The source of the PMOS switch tube is connected to the load, and the drain of the PMOS switch tube is the first control switch unit;

a gate of the PMOS switch tube is connected to the second control switch drive unit;

The source and the gate of the PMOS switch tube are connected by a resistor;

a diode is connected in series between the drain and the gate of the PMOS switch;

The anode of the diode is connected to the drain of the PMOS switch tube, and the cathode of the diode is connected to the gate of the PMOS switch tube through a resistor.