CN216748474U

CN216748474U - Power supply sequential control circuit

Info

Publication number: CN216748474U
Application number: CN202122913104.XU
Authority: CN
Inventors: 不公告发明人
Original assignee: Mornsun Guangzhou Science and Technology Ltd
Current assignee: Mornsun Guangzhou Science and Technology Ltd
Priority date: 2021-11-25
Filing date: 2021-11-25
Publication date: 2022-06-14
Anticipated expiration: 2031-11-25

Abstract

The utility model relates to an electronic circuit technical field discloses a power supply sequential control circuit, including first sampling control circuit, second sampling control circuit and third sampling control circuit: the first sampling control circuit converts the power supply voltage signal output from the auxiliary source into a first voltage control signal; the second sampling control circuit receives a first voltage control signal and a first input signal input from the outside, and outputs a second voltage control signal according to the first voltage control signal and the first input signal; the third sampling control circuit receives a second voltage control signal and a second input signal input from the outside, and outputs a third voltage control signal according to the second voltage control signal and the second input signal so as to control the main control IC to be turned on and turned off. The power supply time sequence control circuit achieves the purpose of controlling the power-on starting time sequence of the power supply.

Description

Power supply sequential control circuit

Technical Field

The utility model relates to an electronic circuit technical field, in particular to power supply sequential control circuit when control IC and the auxiliary power supply, PS _ ON (switch control signal) function simultaneous use from taking high pressure to start.

Background

In a common power management IC in the market at present, power supply modes of the IC are divided into 2 types of self-contained high-voltage start power supply and external auxiliary power supply, and power supplies are different in application scenes and function requirements and are generally realized by multiple topologies. A certain timing relationship is required between each topology.

The following 2 types of common power control circuits are generally available:

first, as shown in fig. 1, the power supply is controlled by the commercial power to turn ON and off, and the power supply does not have a PS _ ON (power switch control signal) function and is not powered by an auxiliary power source. At the moment, the master control IC is required to have a high-voltage starting function or a high-voltage starting charging circuit is added outside, the starting sequence is that the AC is electrified, and the master control IC supplies power to the IC through the internal or external high-voltage starting circuit, so that the master control IC is started.

Secondly, as shown in fig. 2, the power supply has a PS _ ON function and is powered by an auxiliary source, and the power supply is controlled to be turned ON and off by the PS _ ON function. The general boot sequence is: when the AC is electrified, the voltage of the auxiliary source is normally output, PS _ ON is effective, the auxiliary source provides VCC (power supply voltage) to supply power to the main control IC, and then a power supply main power circuit connected with the main control IC is started. At the moment, the main control IC does not have a high-voltage starting function generally, the main control IC is powered by an auxiliary power source VCC, and PS _ ON provided by the outside controls the conduction and the closing of the auxiliary power source VCC to achieve the effect of controlling the output of the main power circuit of the power supply to be switched ON and switched off.

The main advantages of the second power control circuit over the first power control circuit are:

(1) instead of using the mains supply to control the power supply ON and off, the auxiliary power supply function and an externally controllable switching signal PS _ ON may be added to control the power supply ON and off. Through the function, a user can directly realize the management of power on and power off through a software operating system, and further realize the networked power management.

(2) Different from the traditional mains supply, the power supply is controlled to be switched ON and off, after the PS _ ON control power supply is switched off, the auxiliary power supply still has output voltage, and the power supply is in a standby state at the moment.

In recent years, with the increasingly powerful and high integration of power management ICs, many ICs have integrated a high-voltage start-up function, which can save peripheral devices and facilitate use.

The following 2 requirements are simultaneously satisfied for the master IC to be started: (1) VCC normal power supply; (2) the input voltage detection reaches a threshold value.

When the main control IC with the high-voltage starting function is applied to the second power control circuit, a third power control circuit as shown in fig. 3 is formed.

However, the third power control circuit has the following disadvantages: when the input voltage is high enough, the input voltage detection threshold of the main control IC is reached, meanwhile, a high-voltage starting circuit in the main control IC can provide VCC power supply, 2 conditions for starting the main control IC are met, AC is powered ON, the main control IC can be started, output is immediately established, at the moment, the main control IC does not rely ON VCC power supply of an auxiliary source any more, the PS _ ON control function provided by the outside is invalid, namely, the purpose of controlling the power supply to be turned ON and turned off through PS _ ON cannot be achieved, and the problem that the standby power consumption of the power supply is large is caused.

In view of the fact that the third power control circuit in the prior art cannot achieve the purpose of controlling the power ON and off through PS _ ON, it is necessary to design a power timing control circuit to control the timing of the power under the high-voltage input state, so that the power can achieve the purpose of controlling the power ON and off through PS _ ON.

SUMMERY OF THE UTILITY MODEL

It so to have an inspection, the to-be-solved technical problem of the utility model is to provide a power supply sequential control circuit to solve and to have from taking PS _ ON and auxiliary source function now, main control IC is unable opening and closing and leading to the great problem of power stand-by power consumption through PS _ ON control power supply from taking high pressure start function's power control circuit again simultaneously.

In order to solve the technical problem, the utility model provides a power supply time sequence control circuit, power supply time sequence control circuit is used for connecting between the main control IC and the auxiliary source of power, wherein, the auxiliary source is used for receiving the switch control signal of follow external input, and according to a switch control signal output supply voltage signal, power supply time sequence control circuit includes: the sampling control circuit comprises a first sampling control circuit, a second sampling control circuit and a third sampling control circuit;

the first sampling control circuit is provided with a resistor R1 and a filter capacitor C1; one end of the resistor R1 is connected to the supply voltage signal output by the auxiliary source, the other end of the resistor R1 is connected to one end of the filter capacitor C1, and the other end of the filter capacitor C1 is grounded;

the second sampling control circuit is provided with a resistor R3, a resistor R6, a filter capacitor C2 and a switching tube Q1; one end of the resistor R3 is used for receiving a first input signal input from the outside, the other end of the resistor R3 is connected with one end of the resistor R6, the other end of the resistor R6 is connected with the ground, and the filter capacitor C2 is connected with the resistor R6 in parallel; a first end of the switching tube Q1 is connected with one end of the filter capacitor C1, a second end of the switching tube Q1 is connected with a connection point of the resistor R3 and the resistor R6, and a third end of the switching tube Q1 is connected to ground;

the third sampling control circuit is provided with a resistor R7, a resistor R10, a filter capacitor C3 and a switching tube Q2; one end of the resistor R7 is used for receiving a second input signal input from the outside, the other end of the resistor R7 is connected with one end of the resistor R10, the other end of the resistor R10 is grounded, the filter capacitor C3 is connected with the resistor R10 in parallel, and the connection point of the resistor R7 and the resistor R10 is used for being connected with the main control IC; the first end of the switching tube Q2 is connected to the connection point of the resistor R3 and the resistor R6, the second end of the switching tube Q2 is connected to the connection point of the resistor R7 and the resistor R10, and the third end of the switching tube Q2 is grounded.

Preferably, the first input signal and the second input signal are high level signals.

Preferably, the resistor R1, the resistor R3 and the resistor R7 are each composed of a single resistor or a plurality of resistors connected in series.

Preferably, the switching tube Q1 and the switching tube Q2 are transistors or MOS tubes, respectively; when the switching tube Q1 and the switching tube Q2 are MOS tubes, respectively, the first end of the switching tube Q1 is a gate, the second end is a drain, and the third end is a source; the first end of the switching tube Q2 is a gate, the second end is a drain, and the third end is a source.

Preferably, the first sampling control circuit is further provided with a resistor R2; the other end of the resistor R1 is connected with one end of the resistor R2, the other end of the resistor R2 is grounded, and the resistor R2 is connected with the filter capacitor C1 in parallel.

The utility model also provides a power supply sequential control circuit, power supply sequential control circuit is used for connecting between the master control IC and the auxiliary source of power, wherein, the auxiliary source is used for receiving the switch control signal of receiving from external input, and according to a switch control signal output supply voltage signal, power supply sequential control circuit receives supply voltage signal, and according to supply voltage signal control master control IC opens and closes.

Preferably, the power supply timing control circuit includes: the sampling control circuit comprises a first sampling control circuit, a second sampling control circuit and a third sampling control circuit;

the first sampling control circuit converts the supply voltage signal output from the auxiliary source into a first voltage control signal;

the second sampling control circuit is connected with the first sampling control circuit, receives the first voltage control signal and a first input signal input from the outside, and outputs a second voltage control signal according to the first voltage control signal and the first input signal;

the third sampling control circuit is connected with the second sampling control circuit, receives a second voltage control signal and a second input signal input from the outside, outputs a third voltage control signal according to the second voltage control signal and the second input signal, and transmits the third voltage control signal to the main control IC so as to control the main control IC to be opened and closed.

Preferably, the first sampling control circuit has a resistor R1, a resistor R2, and a filter capacitor C1; one end of the resistor R1 is connected with a power supply voltage signal output by the auxiliary source, the other end of the resistor R1 is connected with one end of the resistor R2, the other end of the resistor R2 is grounded, the filter capacitor C1 is connected with the resistor R2 in parallel, and the connection point of the resistor R1 and the resistor R2 is used for outputting the first voltage control signal;

the second sampling control circuit is provided with a resistor R3, a resistor R6, a filter capacitor C2 and a switching tube Q1; one end of the resistor R3 is used for receiving a first input signal input from the outside, the other end of the resistor R3 is connected with one end of the resistor R6, the other end of the resistor R6 is connected with the ground, and the filter capacitor C2 is connected with the resistor R6 in parallel; a first end of the switching tube Q1 is connected with a connection point of the resistor R1 and the resistor R2, a second end of the switching tube Q1 is connected with a connection point of the resistor R3 and the resistor R6, and a third end of the switching tube Q1 is connected with ground; the connection point of the resistor R3 and the resistor R6 is used for outputting the second voltage control signal;

the third sampling control circuit is provided with a resistor R7, a resistor R10, a filter capacitor C3 and a switching tube Q2; one end of the resistor R7 is used for receiving a second input signal input from the outside, the other end of the resistor R7 is connected with one end of the resistor R10, the other end of the resistor R10 is grounded, the filter capacitor C3 is connected with the resistor R10 in parallel, and the connection point of the resistor R7 and the resistor R10 is used for being connected with the main control IC; a first end of the switching tube Q2 is connected to a connection point of the resistor R3 and the resistor R6, a second end of the switching tube Q2 is connected to a connection point of the resistor R7 and the resistor R10, and a third end of the switching tube Q2 is grounded; the junction of the resistor R7 and the resistor R10 is used for outputting the third voltage control signal.

Compared with the prior art, the utility model discloses following beneficial effect has:

the power supply time sequence control circuit controls the high-low level state of an input voltage detection signal of the main control IC by detecting a power supply voltage signal provided by the auxiliary source so as to achieve the purpose of controlling the opening and closing of the main control IC, and meanwhile, the VCC signal is controlled to be opened and closed by a PS _ ON (power supply switch control signal). Therefore, the purpose that the PS _ ON controls the power supply main control IC to be turned ON and off is achieved, the user can directly realize the management of power supply startup and shutdown through a software operating system, and meanwhile, the low standby power consumption can be realized, and the energy conservation and the environmental protection are realized.

Drawings

FIG. 1 is a schematic block diagram of a prior art power control circuit without PS _ ON and auxiliary source functions;

FIG. 2 is a schematic block diagram of a conventional power control circuit with PS _ ON and auxiliary power functions, without a high voltage start function for the main control IC;

FIG. 3 is a schematic block diagram of a conventional power control circuit with PS _ ON and auxiliary power functions, and a main control IC with a high voltage start function;

FIG. 4 is a schematic block diagram of the power timing control circuit of the present invention applied to a power control circuit;

FIG. 5 is a schematic diagram of a power timing control circuit according to a first embodiment of the present invention;

fig. 6 is a schematic diagram of a power timing control circuit according to a second embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Fig. 4 shows a schematic block diagram of the power timing control circuit of the present invention, the power timing control circuit is connected between the main control IC and the auxiliary source of the power supply, wherein the auxiliary source is used for receiving a power switch control signal (referred to as PS _ ON, hereinafter referred to as PS _ ON) inputted from the outside, and outputting a power supply voltage signal VCC to the power timing control circuit according to the PS _ ON; the power supply time sequence control circuit is used for outputting an input voltage detection signal to the main control IC according to the received power supply voltage signal VCC so as to control the high-low level state of an input voltage detection pin of the main control IC, thereby controlling the opening and closing of the main control IC and further realizing the purpose of controlling the opening and closing of the power supply main control IC through PS _ ON.

The power supply time sequence control circuit controls the power supply turn-on time sequence as follows: AC power-ON, auxiliary source starting, PS _ ON effective, auxiliary source providing a power supply voltage signal VCC to a power supply time sequence control circuit, power supply of a main control IC by the power supply time sequence control circuit, main power topology starting of a power supply and output establishment.

First embodiment

Referring to fig. 5, fig. 5 is a schematic diagram of a power timing control circuit according to a first embodiment of the present invention, the power timing control circuit includes 3 sampling control circuits, which are a first sampling control circuit 1, a second sampling control circuit 2 and a first sampling control circuit 3.

The first sampling control circuit converts the supply voltage signal VCC output from the auxiliary source into a first voltage control signal V4. In this embodiment, the first sampling control circuit 1 has a resistor R1, a resistor R2, and a filter capacitor C1, wherein the resistor R1 and the resistor R2 are voltage dividing resistors. One end of the resistor R1 is connected with a power supply voltage signal VCC output by the auxiliary source, the other end of the resistor R1 is connected with one end of the resistor R2, the other end of the resistor R2 is grounded, and the filter capacitor C1 is connected with the resistor R2 in parallel; the junction of the resistor R1 and the resistor R2 is used for outputting a first voltage control signal V4 to control the on/off of the switching tube Q1.

The second sampling control circuit receives the first voltage control signal V4 and a first input signal VBUS1 (high level signal) input from the outside, and outputs a second voltage control signal V5 according to the first voltage control signal V4 and the first input signal VBUS 1.

In this embodiment, the second sampling control circuit 2 has a resistor R3, a resistor R6, a filter capacitor C2, and a switching tube Q1, where the resistor R3 and the resistor R6 are voltage dividing resistors, and the switching tube Q1 is a MOS transistor. One end of the resistor R3 is used for receiving a first input signal VBUS1, the other end of the resistor R3 is connected with one end of the resistor R6, the other end of the resistor R6 is connected with the ground, and the filter capacitor C2 is connected with the resistor R6 in parallel; the gate (first end) of the switching tube Q1 is connected to the connection point of the resistor R1 and the resistor R2, the drain (second end) of the switching tube Q1 is connected to the connection point of the resistor R3 and the resistor R6, and the source (third end) of the switching tube Q1 is connected to ground. The junction point of the resistor R3 and the resistor R6 is used for outputting a second voltage control signal V5, and the second voltage control signal V5 is used as an output signal of the second sampling control circuit 2, and is used for controlling the on/off of the switching tube Q2.

The third sampling control circuit 3 is configured to receive the second voltage control signal V5 and the second input signal VBUS2 (input capacitor voltage), output a third voltage control signal VSubboost (i.e., the input voltage detection signal in fig. 4) according to the second voltage control signal V5 and the second input signal VBUS2, and transmit the third voltage control signal VSubboost to the main control IC to control the main control IC to turn on and off. In this embodiment, the first input signal VBUS1 and the second input signal VBUS2 are the same voltage signal, and both are high level signals.

In this embodiment, the third sampling control circuit 3 has a resistor R7, a resistor R10, a filter capacitor C3, and a switching tube Q2, wherein the resistor R7 and the resistor R10 are voltage dividing resistors, and the switching tube Q2 is a MOS transistor. One end of the resistor R7 is used for receiving a second input signal VBUS2, the other end of the resistor R7 is connected with one end of the resistor R10, the other end of the resistor R10 is grounded, the filter capacitor C3 is connected with the resistor R10 in parallel, and a connection point of the resistor R7 and the resistor R10 is used for being connected with the main control IC; the first end of the switching tube Q2 is connected with the connection point of the resistor R3 and the resistor R6, the second end of the switching tube Q2 is connected with the connection point of the resistor R7 and the resistor R10, and the third end of the switching tube Q2 is grounded; a connection point of the resistor R7 and the resistor R10 is used to output the third voltage control signal VSubboost. The third voltage control signal VSubboost is directly connected to the input voltage detection signal pin of the main control IC to control the main control IC to be turned on or turned off.

The utility model discloses power sequential control circuit's theory of operation as follows:

when high voltage conditions are input, the AC is powered up: in the state that PS _ ON is invalid, the supply voltage signal VCC (which is provided by the auxiliary source) input to the first sampling control circuit 1 is at a low level, and the first voltage control signal V4 output by the first sampling control circuit 1 is at a low level, at this time, the switching tube Q1 is turned off; the first input signal VBUS1 (input capacitor voltage) input to the second sampling control circuit 2 is at a high level, and the second voltage control signal V5 output from the second sampling control circuit 2 is at a high level, at which time the switching tube Q2 is turned on; the second input signal VBUS2 input to the third sampling control circuit 3 is at a high level, and the third voltage control signal VSusboost output from the third sampling control circuit is at a low level, thereby controlling the main control IC to be inactive. At this time, the auxiliary source has output, and the main power has no output.

When PS _ ON is active, the power supply voltage signal VCC input to the first sampling control circuit 1 is at a high level, and the first voltage control signal V4 is at a high level, at which time the switching tube Q1 is turned ON; the first input signal VBus1 is input to the second sampling control circuit 2 and is at a high level, and the second voltage control signal V5 output by the second sampling control circuit 2 is at a low level, at this time, the switching tube Q2 is turned off; the second input signal VBUS2 input to the third sampling control circuit 3 is at a high level, the third voltage control signal VSusboost output from the third sampling control circuit 3 is at a high level, the main control IC operates normally, and at this time, the auxiliary source and the main power are both output normally.

The utility model discloses power sequential control circuit makes when the IC who starts the function from taking the high pressure is used in during the second kind of power control circuit, accessible outside PS _ ON control power master control IC opens and closes to let the user can directly realize the management that the power was started and was shut down through software operating system, can realize lower stand-by power consumption, energy-concerving and environment-protective simultaneously again.

Second embodiment

Fig. 6 is a difference between the second embodiment and the first embodiment of the present invention, in that the resistor R2 is removed from the first sampling control circuit 1 of the power timing control circuit in the second embodiment, and the power supply voltage signal VCC passes through the resistor R1 and then is not divided by the resistor R2. The first voltage control signal V4 is directly outputted to control the on/off of the switch Q1, and the difference is that the threshold voltage controlled by the supply voltage signal VCC cannot be set, but the timing control of the whole power circuit is consistent, and will not be described in detail herein.

The above embodiments are only the preferred embodiments of the present invention, and it should be noted that the above preferred embodiments should not be considered as limitations of the present invention. The present invention can be further modified and modified as will be apparent from the prior art without departing from the spirit and scope of the present invention, and such modifications and modifications should be considered as the protection scope of the present invention, and will not be repeated herein.

Claims

1. A power timing control circuit, wherein the power timing control circuit is configured to be connected between a main control IC and an auxiliary source of a power supply, wherein the auxiliary source is configured to receive a power switch control signal input from the outside and output a supply voltage signal according to the power switch control signal, and the power timing control circuit comprises: the sampling control circuit comprises a first sampling control circuit, a second sampling control circuit and a third sampling control circuit;

the third sampling control circuit is provided with a resistor R7, a resistor R10, a filter capacitor C3 and a switch tube Q2; one end of the resistor R7 is used for receiving a second input signal input from the outside, the other end of the resistor R7 is connected with one end of the resistor R10, the other end of the resistor R10 is grounded, the filter capacitor C3 is connected with the resistor R10 in parallel, and the connection point of the resistor R7 and the resistor R10 is used for being connected with the main control IC; the first end of the switching tube Q2 is connected with the connection point of the resistor R3 and the resistor R6, the second end of the switching tube Q2 is connected with the connection point of the resistor R7 and the resistor R10, and the third end of the switching tube Q2 is grounded.

2. The power timing control circuit of claim 1, wherein the first input signal and the second input signal are high level signals.

3. The power timing control circuit of claim 1, wherein the resistor R1, the resistor R3, and the resistor R7 are each comprised of a single resistor or a plurality of resistors connected in series.

4. The power timing control circuit of claim 1, wherein the switch Q1 and the switch Q2 are transistors or MOS transistors, respectively; when the switching tube Q1 and the switching tube Q2 are MOS tubes, respectively, a first end of the switching tube Q1 is a gate, a second end is a drain, and a third end is a source; the first end of the switching tube Q2 is a grid electrode, the second end is a drain electrode, and the third end is a source electrode.

5. The power timing control circuit of claim 1, wherein the first sampling control circuit is further provided with a resistor R2; the other end of the resistor R1 is connected with one end of the resistor R2, the other end of the resistor R2 is grounded, and the resistor R2 is connected with the filter capacitor C1 in parallel.

6. The power supply time sequence control circuit is characterized in that the power supply time sequence control circuit is used for being connected between a main control IC and an auxiliary source of a power supply, wherein the auxiliary source is used for receiving and receiving a power supply switch control signal input from the outside and outputting a power supply voltage signal according to the power supply switch control signal, and the power supply time sequence control circuit receives the power supply voltage signal and controls the main control IC to be turned on and turned off according to the power supply voltage signal.

7. The power timing control circuit of claim 6, wherein the power timing control circuit comprises: the sampling control circuit comprises a first sampling control circuit, a second sampling control circuit and a third sampling control circuit;

8. The power timing control circuit of claim 7, wherein the first sampling control circuit has a resistor R1, a resistor R2, and a filter capacitor C1; one end of the resistor R1 is connected with a power supply voltage signal output by the auxiliary source, the other end of the resistor R1 is connected with one end of the resistor R2, the other end of the resistor R2 is grounded, the filter capacitor C1 is connected with the resistor R2 in parallel, and the connection point of the resistor R1 and the resistor R2 is used for outputting the first voltage control signal;

the third sampling control circuit is provided with a resistor R7, a resistor R10, a filter capacitor C3 and a switching tube Q2; one end of the resistor R7 is used for receiving a second input signal input from the outside, the other end of the resistor R7 is connected with one end of the resistor R10, the other end of the resistor R10 is grounded, the filter capacitor C3 is connected with the resistor R10 in parallel, and the connection point of the resistor R7 and the resistor R10 is used for being connected with the main control IC; a first end of the switching tube Q2 is connected with a connection point of the resistor R3 and the resistor R6, a second end of the switching tube Q2 is connected with a connection point of the resistor R7 and the resistor R10, and a third end of the switching tube Q2 is grounded; the junction of the resistor R7 and the resistor R10 is used for outputting the third voltage control signal.