CN202586343U

CN202586343U - Parallel power-source power unit

Info

Publication number: CN202586343U
Application number: CN 201220229898
Authority: CN
Inventors: 郭锐; 李虹; 牛睿
Original assignee: Taiyuan University of Science and Technology
Current assignee: Taiyuan University of Science and Technology
Priority date: 2012-05-22
Filing date: 2012-05-22
Publication date: 2012-12-05
Anticipated expiration: 2022-05-22

Abstract

The utility model is a parallel power supply device, which belongs to the technical field of parallel power supply devices; the technical problem to be solved is to provide a power supply device that can flexibly control the output current of each parallel branch of the power supply; the adopted technical scheme is: the first straight The output terminal of the DC power supply is connected to the input terminal of the first DC/DC conversion module, and the output terminal of the second DC power supply is connected to the input terminal of the second DC/DC conversion module; the positive output of the first DC/DC conversion module The terminal is connected to the emitter of the PNP transistor Q1, the collector of the PNP transistor Q1 is connected to one end of the sampling resistor R1, the positive output terminal of the second DC/DC conversion module is connected to one end of the sampling resistor R2, and the first DC The negative output terminal of the /DC conversion module is connected in parallel with the negative output terminal of the second DC/DC conversion module and then grounded; the utility model is applied to electronic devices powered by parallel power supplies.

Description

A kind of parallel connection power supply electric supply installation

Technical field

A kind of parallel connection power supply electric supply installation of the utility model belongs to parallel connection power supply electric supply installation technical field.

Background technology

Along with the development of power electronic technology, power technology is widely used in fields such as computer, industrial instrumentation instrument, military affairs, space flight, relates to the national economy all trades and professions; Various electronic installations require increasingly highly to power, and also more and more harsher to the requirement of electric current, developing various high-power, high performance Switching Power Supplies becomes trend; In development process; Semiconductor constitutes limitations affect such as power device, magnetic material in the power module owing to receive, and the peak power output of single switch power module is limited, therefore; The large power, electrically origin system need be used some Switching Power Supply parallel runnings, to satisfy the requirement of bearing power; Existing parallel connection power supply electric supply installation, two-way source current size is uncontrollable, and parallel connection power supply can not required rated current and the rated voltage of output loading, causes loaded work piece unstable easily, and possibly damage load and parallel connection power supply.

The utility model content

The utility model overcomes the deficiency that prior art exists, and technical problem to be solved is: a kind of electric supply installation that can control each parallel branch output current of power supply flexibly is provided.

For addressing the above problem; The technical scheme that the utility model adopted is: a kind of parallel connection power supply electric supply installation comprises: first DC power supply, second DC power supply, a DC/DC modular converter, the 2nd DC/DC modular converter, single-chip microcomputer, A/D modular converter, D/A modular converter, load, PNP triode Q1 and sampling resistor R1, R2, R3; The output of said first DC power supply links to each other with the input of a DC/DC modular converter, and the output of second DC power supply links to each other with the input of the 2nd DC/DC modular converter;

The cathode output end of a said DC/DC modular converter links to each other with the emitter of PNP triode Q1; The collector electrode of said PNP triode Q1 links to each other with the end of sampling resistor R1; The cathode output end of said the 2nd DC/DC modular converter links to each other with the end of sampling resistor R2, the cathode output end of a DC/DC modular converter and connect the cathode output end of the 2nd DC/DC modular converter after ground connection; The other end of said sampling resistor R1 and connect the other end of sampling resistor R2 after link to each other ground connection after the other end serial connection load of said sampling resistor R3 with the end of sampling resistor R3;

Said A/D modular converter links to each other with the input of single-chip microcomputer, and the A/D modular converter is gathered the last current/voltage value of sampling resistor R1, R2, R3 and is sent to single-chip microcomputer, links to each other with the base stage of PNP triode Q1 behind the output serial connection D/A modular converter of said single-chip microcomputer.

Also be serially connected with diode D1 between the collector electrode of said PNP triode Q1 and the sampling resistor R1, also be serially connected with diode D2 between the cathode output end of the 2nd DC/DC modular converter and the sampling resistor R2.

Also be serially connected with transistor base current-limiting resistance R4 between the base stage of said PNP triode Q1 and the signal output part of D/A modular converter.

Also be serially connected with voltage follower between the signal output part of said transistor base current-limiting resistance R4 and D/A modular converter.

Said single-chip microcomputer also is connected with keyboard and display.

Also be serially connected with over-voltage and over-current and short-circuit protection module between said sampling resistor R3 and the load.

The beneficial effect that the utility model compared with prior art has is: the utility model has been realized the parallel connection use of Switching Power Supply; Solved the not enough problem of single switch output power of power supply; Adopt single-chip microcomputer can control the output current of parallel connection power supply flexibly to the adjusting of the adjusting of transistor base voltage and load resistance; Make two-way power supply output rated current, guarantee that the total current of supply load is stable; Adopt triode control load regulation good, power supply stability is strong, efficient is high, and current ratio control is flexible, and whole apparatus structure is simple, stable, cost is low; This device adopts adjustable ratio joint mode, as long as the multiple power supplies output voltage is identical, but the equal normal power supply of current-sharing or non-current-sharing makes range of application more extensive.

Description of drawings

Below in conjunction with accompanying drawing the embodiment of the utility model is done further detailed explanation:

Fig. 1 is the electrical block diagram of the utility model;

Among the figure: 1 is that first DC power supply, 2 is that second DC power supply, 3 is that a DC/DC modular converter, 4 is that the 2nd DC/DC modular converter, 5 is that single-chip microcomputer, 6 is that A/D modular converter, 7 is that D/A modular converter, 8 is that keyboard, 9 is that display, 10 is that over-voltage and over-current and short-circuit protection module, 11 are that load, 12 is a voltage follower.

Embodiment

A kind of parallel connection power supply electric supply installation of the utility model comprises: first DC power supply 1, second DC power supply 2, a DC/DC modular converter 3, the 2nd DC/DC modular converter 4, single-chip microcomputer 5, A/D modular converter 6, D/A modular converter 7, load 11, PNP triode Q1 and sampling resistor R1, R2, R3;

The output of said first DC power supply 1 links to each other with the input of a DC/DC modular converter 3, and the output of second DC power supply 2 links to each other with the input of the 2nd DC/DC modular converter 4;

The cathode output end of a said DC/DC modular converter 3 links to each other with the emitter of PNP triode Q1; The collector electrode of said PNP triode Q1 links to each other with the end of sampling resistor R1; The cathode output end of said the 2nd DC/DC modular converter 4 links to each other with the end of sampling resistor R2, the cathode output end of a DC/DC modular converter 3 and connect the cathode output end of the 2nd DC/DC modular converter 4 after ground connection; The other end of said sampling resistor R1 and connect the other end of sampling resistor R2 after link to each other the other end serial connection load 11 back ground connection of said sampling resistor R3 with the end of sampling resistor R3;

Said A/D modular converter 6 links to each other with the input of single-chip microcomputer 5; A/D modular converter 6 is gathered the last current/voltage value of sampling resistor R1, R2, R3 and is sent to single-chip microcomputer 5, and output serial connection D/A modular converter 7 backs of said single-chip microcomputer 5 link to each other with the base stage of PNP triode Q1.

Above-mentioned sampling resistor R1, R2 are responsible for gathering two electric currents on the power branch, and sampling resistor R3 is responsible for gathering total output current and the total output voltage after two power branch parallel connections.

TPS 5430 chips that adopt in an above-mentioned DC/DC modular converter 3 and the 2nd DC/DC modular converter 4 are the DC/DC conversion chip of non-isolation type, its input voltage range be 5.5V to 36V, can boost or the step-down conversion to two dc power supplies; Minimum output voltage is 1.2V, normally exports the 3A electric current, and current peak is 4A; Modular converter is under normal circumstances imported the direct current of 24V; The direct current of output 8V, 16W, this chip changing voltage efficient is high, can supply the input supply voltage wide ranges; Output current is big, can satisfy the demand of load 11.

Above-mentioned sampling resistor R1, R2, R3 need through an AD629 amplifier before signal is transferred to A/D modular converter 6, and the voltage of acquired signal is carried out 20 times of decay, prevent to damage single-chip microcomputer; The utility model converts the current/voltage analog quantity that collects into digital quantity through A/D modular converter 6 through sampling resistor R1, R2, R3 and sends into single-chip microcomputer 5; Single-chip microcomputer 5 carries out analytical calculation according to the rated current magnitude of voltage of connecing load 11; And the electric current that calculates exported to the base stage of PNP triode Q1; Collector electrode through PNP triode Q1 controls wherein the current value on the power branch; And then control the current value on another power branch, make total current output value stable, required rated current magnitude of voltage when satisfying load 11 work.

Also be serially connected with diode D1 between the collector electrode of said PNP triode Q1 and the sampling resistor R1, also be serially connected with diode D2 between the cathode output end of the 2nd DC/DC modular converter 4 and the sampling resistor R2; Add diode D1, D2 purpose and be and damage circuit when preventing that two electric currents on the power branch from occurring pouring in down a chimney phenomenon.

Also be serially connected with transistor base current-limiting resistance R4 between the base stage of said PNP triode Q1 and the signal output part of D/A modular converter 7; Add transistor base current-limiting resistance R4 and can reduce the load end electric current, prevent to damage PNP triode Q1.

Also be serially connected with voltage follower 12 between the signal output part of said transistor base current-limiting resistance R4 and D/A modular converter 7; Adding voltage follower 12 can improve the carrying load ability of D/A modular converter 7, and making D/A modular converter 7 send signal can driven PNP triode Q1.

Said single-chip microcomputer 5 also is connected with keyboard 8 and display 9; For guaranteeing that parallel connection power supply output suitable current voltage gives load 11, need that the current/voltage value of parallel connection power supply output is carried out ratio and amplify or reduce, this process can be through keyboard 8 controls; Keyboard 8 is provided with 4 buttons, is respectively to scale up, reduce in proportion, confirms and initialization; Keyboard 8 is to single-chip microcomputer 5 input regulation and control instruction, single-chip microcomputer 5 output control signal corresponding, and the current/voltage control through triode changes the current/voltage ratio ratio of two branch roads, reaches the required electric current and voltage value of load 11; Display 9 content displayed have: the ratio of each branch current, total branch road electric current, two branch currents and total output voltage.

Also be serially connected with over-voltage and over-current and short-circuit protection module 10 between said sampling resistor R3 and the load 11; Above-mentioned over-voltage and over-current and short-circuit protection module 10 can compare the total output current magnitude of voltage of device with single-chip microcomputer 5 predefined current/voltage threshold values; When short circuit or output current magnitude of voltage occurring above preset threshold; The inner metal-oxide-semiconductors of over-voltage and over-current and short-circuit protection module 10 can automatic disconnection, and circuit gets into guard mode, when output current voltage drops to threshold value when following; The automatic conducting of metal-oxide-semiconductor meeting of over-voltage and over-current and short-circuit protection module 10 inside, circuit returns to normal operating conditions; With the method protective circuit is convenient, reliable, cost is low, response is fast.

In the utility model: it is the DC/DC modular converter of TPS5430 that a DC/DC modular converter 3 and the 2nd DC/DC modular converter 4 adopt the chip model; It is the single-chip microcomputer of 80C51F320 that single-chip microcomputer 5 adopts the chip model; It is the A/D modular converter of AD7795 that A/D modular converter 6 adopts model; The model of D/A modular converter 7 is MAX512; It is the positive-negative-positive triode of TIP41C that PNP triode Q1 adopts model, and diode D1, D2 adopt Schottky diode, and it is the sampling resistor of 0.1 Ω 20W that sampling resistor R1, R2, R3 adopt specification.

Claims

1. A parallel power supply device, comprising: a first DC power supply (1), a second DC power supply (2), a first DC/DC conversion module (3), a second DC/DC conversion module (4), Single-chip microcomputer (5), A/D conversion module (6), D/A conversion module (7), load (11), PNP transistor Q1 and sampling resistors R1, R2, R3; characterized in that: the first DC The output terminal of the power supply (1) is connected to the input terminal of the first DC/DC conversion module (3), and the output terminal of the second DC power supply (2) is connected to the input terminal of the second DC/DC conversion module (4);

The positive output terminal of the first DC/DC conversion module (3) is connected to the emitter of the PNP transistor Q1, the collector of the PNP transistor Q1 is connected to one end of the sampling resistor R1, and the second DC/DC conversion module The positive output terminal of (4) is connected to one end of the sampling resistor R2, and the negative output terminal of the first DC/DC conversion module (3) is connected to the negative output terminal of the second DC/DC conversion module (4) in parallel and grounded; The other end of the sampling resistor R1 is connected in parallel with the other end of the sampling resistor R2 and then connected to one end of the sampling resistor R3, and the other end of the sampling resistor R3 is connected in series with the load (11) and grounded;

The A/D conversion module (6) is connected to the input terminal of the single-chip microcomputer (5), and the A/D conversion module (6) collects the current and voltage values on the sampling resistors R1, R2, R3 and sends them to the single-chip microcomputer (5), so The output end of the single chip microcomputer (5) is connected in series with the D/A conversion module (7) and then connected to the base of the PNP transistor Q1.

2. A parallel power supply device according to claim 1, characterized in that: a diode D1 is connected in series between the collector of the PNP transistor Q1 and the sampling resistor R1, and the second DC/DC conversion module (4 A diode D2 is also connected in series between the positive output terminal of ) and the sampling resistor R2.

3. A parallel power supply device according to claim 2, characterized in that: the base of the PNP transistor Q1 is connected in series with the signal output terminal of the D/A conversion module (7). Flow resistor R4.

4. A parallel power supply device according to claim 3, characterized in that: a voltage follower is connected in series between the triode base current limiting resistor R4 and the signal output terminal of the D/A conversion module (7) (12).

5. A parallel power supply device according to claim 4, characterized in that: the single-chip microcomputer (5) is also connected with a keyboard (8) and a display (9).

6. A parallel power supply device according to any one of claims 1 to 5, characterized in that an overvoltage, overcurrent and short circuit protection module (10 ).