CN208000514U - A kind of more power sequencing systems based on low pressure turn-off function - Google Patents

Abstract

A kind of more power sequencing systems based on low pressure turn-off function of the utility model belong to the technical field of power module control;The technical issues of solution is:There is provided that a kind of hardware mode is realized, response speed is faster, the higher more power sequencing systems based on low pressure turn-off function of reliability;The technical solution used for:Including the first power module, second power supply module, third power module, logic IC modules, load blocks and Power Entry Module;The output end of the Power Entry Module is connected with the UVLO low pressure shutdown end of the Enable Enable Pins of the first power module, the UVLO low pressure of second power supply module shutdown end, third power module respectively, and the start and stop voltage value that the start and stop voltage value of the first power module Enable Enable Pins, the start and stop voltage value at second power supply module UVLO low pressure shutdown end, third power module UVLO low pressure turn off end is all different.

Description

A kind of more power sequencing systems based on low pressure turn-off function

Technical field

A kind of more power sequencing systems based on low pressure turn-off function of the utility model belong to power module control Technical field.

Background technology

In complicated power-supply system, it usually needs realize different functions, such as LDO low pressure with multiple power modules Poor constant pressure module, DC/DC switched mode boosts module, DC/DC switch-type voltage-dropping modules etc.;In order to reduce for power input It powers on and is impacted with power down, need to set each power module and opens according to the sequence of setting and close successively successively, it is whole to increase The stability and reliability of a power-supply system.

At present in power module IC chip, it generally all can carry enabled Enable functions and low pressure turns off UVLO functions, The relationship of the two is logical "and", i.e., when enabled and low pressure turn-off function meets condition simultaneously, power module IC chip ability Normal work generally uses software-controlled manner, low-response and reliability is relatively low.

Utility model content

The utility model overcomes the shortcomings of the prior art, technical problem to be solved to be:A kind of hardware side is provided More power sequencing systems based on low pressure turn-off function that formula is realized.

In order to solve the above-mentioned technical problem, the technical solution adopted in the utility model is:

A kind of more power sequencing systems based on low pressure turn-off function, including the first power module, second source mould Block, third power module, logic IC modules, load blocks and Power Entry Module;The output end of the Power Entry Module point With the Enable Enable Pins of the first power module, the UVLO low pressure of second power supply module shutdown end, third power module UVLO low pressure turns off end and is connected, and the output end of first power module is connected with the input terminal of logic IC modules, the logic The output end of IC modules is connected with described with the control terminal of load blocks, output end and the third power supply of the second power supply module The input terminal of module is connected, and the output end of the third power module is connected with the power end of load blocks;First power supply The start and stop voltage value of module Enable Enable Pins, start and stop voltage value, the third power supply at second power supply module UVLO low pressure shutdown end The start and stop voltage value at module UVLO low pressure shutdown end is all different.

Preferably, the startup voltage of the first power module Enable Enable Pins is >=5.5V, the second source mould The startup voltage that block UVLO low pressure turns off end is >=7.3V, and the startup voltage at third power module UVLO low pressure shutdown end is ≥8.15V。

Preferably, the stopping voltage of the first power module Enable Enable Pins is≤5V, the second power supply module The stopping voltage that UVLO low pressure turns off end is≤5.8V, the stopping voltage at third power module UVLO low pressure shutdown end is≤ 7.05V。

Preferably, the output end constant output 5V voltages of first power module are logic IC module for power supply;Described The output end constant output 5V voltages of two power modules are powered for third power module;The output end of the third power module is permanent Surely output 1A voltages are power load modules.

Preferably, first power module is the LDO low voltage difference constant pressure modules of model TPS7B6750;Second electricity Source module is the DC/DC switched mode boost modules of model LM5022;The third power module is that the DC/DC of model LM3409 is opened Pass formula is depressured constant current source module.

The utility model has the advantages that compared with prior art.

A kind of more power sequencing systems based on low pressure turn-off function of the utility model carry power module low Pressure shutdown UVLO functions are combined with the output voltage of Power Entry Module, and more power supply moulds are set gradually with a kind of hardware mode The sequence that block opens and closes.The stability and reliability of control response speed and entire power-supply system can be greatly improved, The work load of other control system is reduced simultaneously;Power supply is impacted and enhanced with power down for reducing powering on for power input The reliability of output end rear class operating circuit plays positive effect.

Description of the drawings

The utility model is described in more detail below in conjunction with the accompanying drawings.

Fig. 1 is the structural schematic diagram of the utility model;

Fig. 2 is the curve graph of Power Entry Module output voltage in the utility model powered on power down;

Fig. 3 is the control process powered in the utility model with multi-power module sequence opening and closing during power down Figure;

Fig. 4 is the hysteresis condition setting curve of second power supply module UVLO functions in the utility model;

In figure:1 is the first power module, and 2 be second power supply module, and 3 be third power module, and 4 be logic IC modules, 5 It is Power Entry Module for load blocks, 6.

Specific implementation mode

It is new below in conjunction with this practicality to keep the purpose, technical scheme and advantage of the utility model embodiment clearer Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched The embodiment stated is a part of the embodiment of the utility model, instead of all the embodiments;Based on the reality in the utility model Example is applied, the every other embodiment that those of ordinary skill in the art are obtained without creative efforts all belongs to In the range of the utility model protection.

As shown in Figure 1, a kind of more power sequencing systems based on low pressure turn-off function, including:First power module 1, second power supply module 2, third power module 3, logic IC modules 4, load blocks 5 and Power Entry Module 6;The power supply is defeated The output end for entering module 6 is turned off with the Enable Enable Pins of the first power module 1, the UVLO low pressure of second power supply module 2 respectively End, the UVLO low pressure shutdown end of third power module 3 are connected, output end and the logic IC modules 4 of first power module 1 Input terminal is connected, and the output end of the logic IC modules 4 is connected with the control terminal with load blocks 5, the second source The output end of module 2 is connected with the input terminal of third power module 3, output end and the load blocks 5 of the third power module 3 Power end be connected;The start and stop voltage value of the first power module 1Enable Enable Pins, second power supply module 2UVLO low pressure The start and stop voltage value of the start and stop voltage value, third power module 3UVLO low pressure shutdown end that turn off end is all different.

In the utility model, the first power module 1, second power supply module 2, third power module 3 startup voltage value it Between be provided with interval, ensure to power on the sequence and reliability with power down between multiple power modules.

Specifically, the startup voltage of the first power module 1Enable Enable Pins is >=5.5V, the second source mould The startup voltage that block 2UVLO low pressure turns off end is >=7.3V, the startup voltage at third power module 3UVLO low pressure shutdown end For >=8.15V.

Further, the stopping voltage of the first power module 1Enable Enable Pins is≤5V, the second source mould The stopping voltage that block 2UVLO low pressure turns off end is≤5.8V, the stopping voltage at third power module 3UVLO low pressure shutdown end For≤7.05V.

Fig. 2 is the curve graph of Power Entry Module output voltage in the utility model powered on power down, and Fig. 3 is this practicality It is powered in novel and the control procedure chart that multi-power module sequence opens and closes during power down, as shown in Figure 2 and Figure 3, this reality The process opened with more power supplys sequence in novel is:It is that all logic IC modules 4 of rear class are powered to open the first power module 1, It is then turned on second power supply module 2 to power for rear class third power module 3, it is negative to rear class finally to open third power module 3 Module 5 is carried to power;The process of more power supply orderly close-downs in the utility model is:Third power module 3 is closed, is then shut off the Two power modules 2 finally close the first power module 1;In the present embodiment, the output end of the Power Entry Module 6 is arranged There are multiple capacitances, for reaching the buffer time for powering on and being needed during power down;Wherein, in Fig. 2(1)Figure is power input mould Block output voltage powers on curve graph, in Fig. 2(2)Figure is the power down curve graph of Power Entry Module output voltage.

Fig. 4 is the hysteresis condition setting curve of second power supply module UVLO functions in the utility model, as shown in figure 4, this In utility model, to prevent Power Entry Module 6 from generating oscillation in output supply voltage shakiness, powers on and fall in input voltage In the process of electricity, the first power module 1, second power supply module 2, the startup voltage set by third power module 3 and stop electricity There are hysteresis sections between pressure value, and start electricity Ya Zhi >Stop voltage value.

In the present embodiment, the output end constant output 5V voltages of first power module 1 are powered for logic IC modules 4; The output end constant output 5V voltages of the second power supply module 2 are powered for third power module 3;The third power module 3 Output end constant output 1A voltages be load blocks 5 power.

First power module 1 is the LDO low voltage difference constant pressure modules of model TPS7B6750, the second power supply module 2 For the DC/DC switched mode boost modules of model LM5022, the third power module 3 is the DC/DC switching regulators of model LM3409 It is depressured constant current source module.

Finally it should be noted that:The above various embodiments is only to illustrate the technical solution of the utility model, rather than limits it System;Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should Understand:It still can be with technical scheme described in the above embodiments is modified, either to which part or whole Technical characteristic carries out equivalent replacement;And these modifications or replacements, this practicality that it does not separate the essence of the corresponding technical solution are new The range of each embodiment technical solution of type.

Claims (4)

1. a kind of more power sequencing systems based on low pressure turn-off function, it is characterised in that:Including the first power module (1), second power supply module (2), third power module (3), logic IC modules (4), load blocks (5) and Power Entry Module (6);

The output end of the Power Entry Module (6) respectively with the Enable Enable Pins of the first power module (1), second source mould The UVLO low pressure shutdown end of block (2), the UVLO low pressure shutdown end of third power module (3) are connected, first power module (1) Output end be connected with the input terminal of logic IC modules (4), the output ends of the logic IC modules (4) and the load blocks (5) control terminal is connected, and the output end of the second power supply module (2) is connected with the input terminal of third power module (3), described The output end of third power module (3) is connected with the power end of load blocks (5);

The start and stop voltage value of first power module (1) the Enable Enable Pins, second power supply module (2)

UVLO low pressure turns off the start and stop voltage value at end, third power module (3) UVLO low pressure turns off the start and stop voltage value at end not It is identical;

First power module (1) is the LDO low voltage difference constant pressure modules of model TPS7B6750, the second power supply module (2) For the DC/DC switched mode boost modules of model LM5022, the DC/DC that the third power module (3) is model LM3409 is switched Formula is depressured constant current source module;

The startup voltage of first power module (1) the Enable Enable Pins is >=5.5V, second power supply module (2) UVLO The startup voltage that low pressure turns off end is >=7.3V, the startup voltage at third power module (3) UVLO low pressure shutdown end is >= 8.15V;

The stopping voltage of first power module (1) the Enable Enable Pins is≤5V, and second power supply module (2) UVLO is low The stopping voltage at pressure shutdown end is≤5.8V, the stopping voltage at third power module (3) UVLO low pressure shutdown end is≤ 7.05V。

2. a kind of more power sequencing systems based on low pressure turn-off function according to claim 1, it is characterised in that: The output end constant output 5V voltages of first power module (1) are powered for logic IC modules (4).

3. a kind of more power sequencing systems based on low pressure turn-off function according to claim 1, it is characterised in that: The output end constant output 5V voltages of the second power supply module (2) are powered for third power module (3).

4. a kind of more power sequencing systems based on low pressure turn-off function according to claim 1, it is characterised in that: The output end constant output 1A voltages of the third power module (3) are powered for load blocks (5).