CN103532090A

CN103532090A - Multilevel, online and adjustable overcurrent protection module

Info

Publication number: CN103532090A
Application number: CN201310529388.XA
Authority: CN
Inventors: 曾雪刚; 王林波; 董丹; 马鹏飞; 太超
Original assignee: Shenyang Jun Weixinneng Science And Technology Ltd
Current assignee: Shenyang Jun Weixinneng Science And Technology Ltd
Priority date: 2013-10-30
Filing date: 2013-10-30
Publication date: 2014-01-22
Anticipated expiration: 2033-10-30
Also published as: CN103532090B

Abstract

The invention discloses a multilevel, online and adjustable overcurrent protection module, and belongs to the technical field of power supply applications. The module comprises an amplification and zero-cross detection module, a protection locking and unlocking module, a counter module, a time control module, a state indication module and an output module, wherein the amplification and zero-cross detection module comprises a PGA (programmable gain amplifier), at least two groups of digital analog converters VDAC and a comparator COMP; the protection locking and unlocking module adopts an overcurrent state control register Control_Reg_EN; the counter module adopts an Ln_COUNER register; the time control module is composed of a plurality of time controllers Control_reg_LN; and the state indication module is a Statusl_Reg register. Compared with conventional threshold detection, time duration of each level of overcurrent protection can be adjusted by the PGA and the overcurrent state control register Control_Reg_EN, and the multilevel window concept of overcurrent protection is increased, so that multilevel current and time protection windows are provided for overcurrent protection, the current and time combination is configurable, and advantages of high adaptability and expansibility are realized.

Description

Overcurrent protection module that multistage in-line is adjustable

Technical field

The present invention relates to a kind of module that overcurrent protection is provided for power supply and load, belong to application of power technical field.

Background technology

Overcurrent protection main method is Threshold detection at present.When current value reaches threshold value, protective circuit action, cuts off current circuit.In order to prevent the interference of momentary pulse to circuit, Part Methods has added pulse absorb and delay circuit.But when above method cannot solve load acute variation, peak pulse much larger than protection thresholding situation, easily cause system misoperation or damage power supply and load.

Summary of the invention

The deficiency existing in order to solve transmission Threshold detection method, the object of this invention is to provide a kind of module of can be effectively power supply and load being carried out to overcurrent protection.

The object of the invention is to be achieved through the following technical solutions: overcurrent protection module that multistage in-line is adjustable, it is characterized in that: comprise and amplifying and zero passage detection module, protection locking and solution are protected module, counter module, time control module, state indicating module and output module, described amplification and zero passage detection module, the output of time control module is connected with the input of counter module respectively, the output of counter module and state indicating module, the input of output module connects, the two-way output that protection locking and solution are protected module is connected with counter module and output module respectively, described amplification and zero passage detection module, protection locking and solution are protected module, state indicating module is realized communication by api interface and outside.

Described amplification and zero passage detection module are by 1 programmable gain amplifier PGA; at least 2 group digital to analog converter VDAC and comparator C OMP form; described protection locking and solution are protected module and are adopted over-current state control register Conrtol_Reg_EN; described counter module adopts Ln_COUNER register; described time control module is that several time controllers Control_reg_LN forms, and described state indicating module is Statusl_Reg register.

Described programmable gain amplifier PGA output is connected with the positive pole of comparator C OMP, and the output of digital to analog converter VDAC is connected with the negative pole of comparator C OMP, and the TRIGGER pin of the output counter Ln_COUNER register of comparator C OMP connects.

When amplifying and more than 3 groups digital to analog converter VDAC and comparator C OMP are set zero passage detection module; wherein one group of digital to analog converter VDAC and comparator C OMP set for short-circuit protection thresholding; be that threshold is set; remaining digital to analog converter VDAC and comparator C OMP group; for multi-stage protection thresholding, set, comprise the setting of threshold and time threshold.

In amplification and zero passage detection module, PGA is responsible for electric current samples and discharges.VDAC is used for arranging overcurrent protection threshold values at different levels.COMP is responsible for the output of PGA and VDAC to compare, if the current value detecting is higher than the threshold value comparator output current signal that transfinites.

Time control module is comprised of several time controllers Control_reg_LN, can set guard time thresholdings at different levels.

It is one group of over-current state control register Conrtol_Reg_EN that protection locking and solution are protected module, and itself is controlled by API, can control counter module and output control module again simultaneously.After overcurrent protective current and time threshold all transfinite, this module is responsible for locking guard mode, disconnects output, and the corresponding indicating bit of SM set mode indicating module, closes counter; After the unlock command that receives user, open output, by the corresponding indicating bit zero clearing of state indicating module, enable counter.

Api interface, by C language compilation, calls for user, and user can pass through the state of this interface fetch protection module, can also control the lock out action of this module of protection.

State indicating module can indicate overcurrent protection to occur in which rank.

Output control module can cut off output after protection occurs, and recovers output after receiving the unlock command of API.

Beneficial effect of the present invention: the present invention adopts such scheme; compare with existing Threshold detection; can adjust by programmable gain amplifier PGA and over-current state control register Conrtol_Reg_EN the timing duration of overcurrent protections at different levels; this scheme has increased the multistage window concept of overcurrent protection; make overcurrent protection there is multistage electric current and guardtime window; and electric current and ageing are configurable, have advantages of that strong adaptability, autgmentability are strong: protective condition can be adjustable flexibly according to load state.The in the situation that of Digital and analog resource abundance, can expand to the protecting window of at least 2 grades, more accurate overcurrent Waveform Control is provided.

Accompanying drawing explanation

Fig. 1 is structured flowchart of the present invention.

Fig. 2 is equal adjustable overcurrent protection module of embodiment 1(2 level electric current and time) schematic diagram.

Fig. 3 is embodiment 2(3 level overcurrent protection module, wherein 2 grades of electric currents and time all adjustable, 1 grade of short-circuit protection) schematic diagram.

Fig. 4 is embodiment 3(5 level overcurrent protection module, wherein 4 grades of electric currents and time all adjustable, 1 grade of short-circuit protection) schematic diagram.

Embodiment

Embodiment 1: overcurrent protection module that multistage in-line is adjustable, and as shown in Figure 1, comprise and amplifying and zero passage detection module 1, protection locking and solution guarantor module 2, counter module 3, time control module 4, state indicating module 5 and output module 6,

Wherein amplify and zero passage detection module 1 consists of a programmable gain amplifier PGA, 2 groups of digital to analog converter VDAC and comparator C OMP;

Protection locking and solution are protected module 2 and are adopted over-current state control register Conrtol_Reg_EN;

Counter module 3 adopts Ln_COUNER register;

Time control module 4 is by 2 time controller Conrtol_reg_L1(L) (H), Conrtol_reg_L2(L) (H) forms;

State indicating module 5 is Statusl_Reg register.

Programmable gain amplifier PGA output is connected with the positive pole of comparator C OMP respectively, the output of digital to analog converter VDAC is connected with the negative pole of comparator C OMP, the output of comparator C OMP is connected with the TRIGGER pin of counter Ln_COUNER, time controller Conrtol_reg_L1(L) (H), Conrtol_reg_L2(L) output of (H) is connected with L1, the L2 pin of counter Ln_COUNER.

The OC-TYPE pin of counter Ln_COUNER is connected with two status pin status-0, status-1 of state indication Statusl_Reg register.The INTERPUPT pin of counter Ln_COUNER is connected with output module DSG CTRL.

The control-0 end that protection locking and solution are protected the over-current state control register Conrtol_Reg_EN of module is connected with the EN pin of counter Ln_COUNER, and the control-1 end of over-current state control register Conrtol_Reg_EN is connected with output module DSG CTRL.

Embodiment 2: be with the difference of embodiment 1: adopt 3 groups of digital to analog converter VDAC and comparator C OMP; wherein one group of digital to analog converter VDAC and comparator C OMP set for short-circuit protection thresholding; another group digital to analog converter VDAC and comparator C OMP group; threshold for multi-stage protection is set, and can adjust the protection action delay time by 1 time controller Conrtol_reg_L1 simultaneously.Each module annexation is with embodiment 1.

Wherein the threshold of short-circuit protection is set and is completed by VDAC8_L2, and the output of VDAC8_L2 is the input reference of device COMP_L2 as a comparison, and when input current value is greater than after the value of VDAC8_L2, comparator C OMP_L2 output switching activity, triggers L ₃_ COUNER, controls output module and the action of state indicating module, completes short-circuit protection function.

Embodiment 3: the difference of the present embodiment and embodiment 1 is: adopt 5 groups of digital to analog converter VDAC and comparator C OMP; wherein one group of digital to analog converter VDAC and comparator C OMP set for short-circuit protection thresholding; remaining digital to analog converter VDAC and comparator C OMP group, set for 4 grades of protective current thresholdings.Time control module 4 is by 4 time controller Conrtol_reg_L1(L) (H), Conrtol_reg_L2(L) (H), Conrtol_reg_L3(L) (H), Conrtol_reg_L4(L) (H) forms.Time controller Conrtol_reg_L1(L) (H), Conrtol_reg_L2(L) (H) Conrtol_reg_L3(L) (H), Conrtol_reg_L4(L) output of (H) is connected with L1, L2, L3, the L4 pin of counter Ln_COUNER register.Other module annexations are with embodiment 1.

Wherein the threshold of short-circuit protection is set and is completed by VDAC8_L2, and the output of VDAC8_L2 is the input reference of device COMP_L2 as a comparison, and when input current value is greater than after the value of VDAC8_L2, comparator C OMP_L2 output switching activity, triggers L ₅_ COUNER, controls output module and the action of state indicating module, completes short-circuit protection function.

Operation principle of the present invention (while supposing total N level protection):

The present invention is mainly divided into two courses of work: overcurrent protection state enters process and guard mode is removed process.

System is set overcurrent protection threshold by VDAC, by timer design, determines overcurrent protection event thresholding.

Guard mode enters process: when amplifying and zero passage detection module overcurrent protection threshold detected; flip-flop number starts counting; when counter overflow; while reaching threshold value during description time width; protective circuit action, output protection signal and terminal request signal, the simultaneously set of over-current state register corresponding positions; cutting system output, guard mode locking.

But when electric current reach protection thresholding and before counter overflow comparator level again overturn; illustrate that electric current has dropped to below protection thresholding; the TRIGGER corresponding positions zero clearing of counter, LN_COUNTER corresponding counts module automatically resets, and overcurrent protection state starts reclocking.

Guard mode is removed process: system need to respond in this and have no progeny by the api interface de-preservation state of calling module.

Wherein counter module programming class selects VERILOG language to realize.Api interface module programming can be selected by C language and realize.

Claims

1. the adjustable overcurrent protection module of multistage in-line, it is characterized in that: comprise and amplifying and zero passage detection module (1), protection locking and solution are protected module (2), counter module (3), time control module (4), state indicating module (5) and output module (6), described amplification and zero passage detection module (1), the output of time control module (4) is connected with the input of counter module (3) respectively, the output of counter module (3) and state indicating module (5), the input of output module (6) connects, the two-way output that protection locking and solution are protected module (2) is connected with counter module (3) and output module (6) respectively, described amplification and zero passage detection module (1), protection locking and solution are protected module (2), state indicating module (5) is realized communication by api interface (7) and outside.

2. the adjustable and overcurrent protection module of multistage in-line according to claim 1, it is characterized in that: described amplification and zero passage detection module (1) are by 1 programmable gain amplifier PGA, at least 2 group digital to analog converter VDAC and comparator C OMP form, described protection locking and solution are protected module (2) and are adopted over-current state control register Conrtol_Reg_EN, described counter module (3) adopts Ln_COUNER register, described time control module (4) is that several time controllers Control_reg_LN forms, described state indicating module (5) is Statusl_Reg register.

3. the adjustable overcurrent protection module of multistage in-line according to claim 2; it is characterized in that: described programmable gain amplifier PGA output is connected with the positive pole of comparator C OMP; the output of digital to analog converter VDAC is connected with the negative pole of comparator C OMP, and the TRIGGER pin of the output counter Ln_COUNER register of comparator C OMP connects.

4. the adjustable and overcurrent protection module of multistage in-line according to claim 2; it is characterized in that: when amplifying and more than 3 groups digital to analog converter VDAC and comparator C OMP are set zero passage detection module (1); wherein one group of digital to analog converter VDAC and comparator C OMP set for short-circuit protection thresholding; be that threshold is set; remaining digital to analog converter VDAC and comparator C OMP group; for multi-stage protection thresholding, set, comprise the setting of threshold and time threshold.