CN211123819U - Alternating current-direct current switching control system - Google Patents

Abstract

The utility model discloses an alternating current-direct current switches control system, including power module (E) and detection control module, power module (E) are used for converting input current into the required direct current of load, and input current is exported by anodal output (N) and negative pole output (L) respectively behind power module (E), detection control module includes drive control chip (C), still including sampling resistor (R), first N channel MOS pipe (Q1) and second N channel MOS pipe (Q2) of establishing ties, sampling resistor (R) feedback signal gives drive control chip (C) and controls the end/switch-on of first N channel MOS pipe (Q1) or second N channel MOS pipe (Q2), when drive control chip (C) detected reverse current, control second N channel MOS pipe (Q2) and end, prevent that the circuit from pouring in reverse, when the output current that drive control chip C detected is greater than its internal current limit value, control first N channel MOS pipe (Q1) and prevent that the output short circuit protection from overflowing.

Description

Alternating current-direct current switching control system

Technical Field

The utility model relates to an exchange, DC supply technical field, in particular to alternating current-direct current switching control system.

Background

At present, in the field of power supplies, there are many input source switching schemes for ac and dc access, and most of the schemes adopt that a diode is connected in series at an output end to prevent backflow, or adopt switching devices such as a relay to control. The automatic switching process of the input source applied to the power supply still has the following problems:

1. although the output end is connected with the diode in series, seamless switching can be achieved, the power consumption of the device is high, and the efficiency of the whole machine is low;

2. when the switching devices such as relays and the like are adopted for control, the power consumption can be reduced, but certain switching time exists in the switching process, and the influence of instant power failure on secondary equipment can be caused.

Therefore, the conventional switching technology has certain limitations, and cannot solve the problem of switching time while reducing power consumption.

SUMMERY OF THE UTILITY MODEL

To the not enough that exists among the prior art, the utility model aims to provide an alternating current-direct current switching control system to solve and can't reduce the consumption and solve the problem of switching time simultaneously at the switching circuit.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

an alternating current and direct current switching control system comprises a power supply module E and a detection control module, wherein the power supply module E is used for converting input current into direct current required by a load, the input current is output by a positive electrode output end N and a negative electrode output end L after passing through the power supply module E, the detection control module comprises a driving control chip C, and further comprises a sampling resistor R, a first N-channel MOS tube Q1 and a second N-channel MOS tube Q2 which are connected in series, and the sampling resistor R feeds back a signal to the driving control chip C to control the cut-off/conduction of the first N-channel MOS tube Q1 or the second N-channel MOS tube Q2.

Further, the driving control chip C receives the output current fed back by the sampling resistor R and compares the output current with a current limit value inside the sampling resistor R, the output current is greater than or less than the current limit value, and the driving control chip C controls the first N-channel MOS transistor Q1 to be turned off/on; when the driving control chip C detects the reverse current of the sampling resistor R, the second N-channel MOS transistor Q2 is controlled to be turned off, and otherwise, the second N-channel MOS transistor Q2 is turned on.

Preferably, the driving control chip C adopts a chip L TC4364-2, a pin HGATE of the chip L TC4364-2 is connected with a first gate G1 of a first N-channel MOS transistor Q1, a pin DGATE is connected with a second gate G2 of a second N-channel MOS transistor Q2, a pin SENSE is connected with an input end of a sampling resistor R, a pin OUT is connected with an output end of the sampling resistor R, a pin SOURCE is connected with a first SOURCE S1 of the first N-channel MOS transistor Q1 and a second SOURCE S2 of the second N-channel MOS transistor Q2, a first SOURCE S1 of the first N-channel MOS transistor Q1 is connected with a second SOURCE S2 of the second N-channel MOS transistor Q2, a first drain D1 of the first N-channel MOS transistor Q1 is connected with an anode output end N, and a first drain D2 of the second N-channel MOS transistor Q2 is connected with the input end of the sampling resistor R.

Preferably, the power module E employs an AC-DC/DC-DC converter according to the input current being AC/DC.

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

the utility model discloses carry out the access design of handing over, direct current at the power module output, the internal resistance is very low when N channel MOS pipe switches on, can effectively reduce the consumption, can solve the problem of switching time when reducing the consumption through two N channel MOS pipes of series connection, two N channel MOS pipes control it through drive control chip C and cut off/switch on, when drive control chip C detected reverse current, control second N channel MOS pipe Q2 and cut off, its characteristic is equivalent to the diode, can realize that the multichannel is parallelly connected in the circuit and prevents flowing backwards and carry out the current access; when the output current fed back by the sampling resistor received by the driving control chip C is larger than the internal current limit value, the driving chip C controls the first N-channel MOS tube Q1 to be cut off, the circuit can effectively finish output overcurrent and short-circuit protection, and the power module E is prevented from being damaged due to overlarge output current.

Drawings

FIG. 1 is a schematic structural view of the present embodiment;

fig. 2 is a schematic diagram of a first N-channel MOS transistor and a second N-channel MOS transistor connected in series.

The power supply circuit comprises a power supply module, a driving control chip, a sampling resistor, a Q1, a first N-channel MOS (metal oxide semiconductor) transistor, a Q2, a second N-channel MOS transistor, an N, a positive electrode output end, a L, a negative electrode output end, a D1, a first drain electrode, an S1, a first source electrode, a G1, a first grid electrode, a D2, a second drain electrode, an S2, a second source electrode, a G2 and a second grid electrode.

Detailed Description

For making the utility model realize, the technical means, the creation characteristics, the achievement purpose and the effect are clearer and are easy to understand, it is right to combine the figure and the detailed implementation mode below the utility model discloses do further explanation:

the utility model discloses an alternating current-direct current switches control system, including power module E and detection control module, power module E is used for converting input current into the required direct current of load, and input current is exported by positive output N and negative output L respectively behind power module E, detection control module includes drive control chip C, still includes sampling resistor R, first N channel MOS pipe Q1 and second N channel MOS pipe Q2 of establishing ties, and sampling resistor R feedback signal gives drive control chip C control first N channel MOS pipe Q1 or second N channel MOS pipe Q2 cut-off/switch-on, drive control chip C receives the output current of sampling resistor R feedback and compares rather than inside current limit, and output current is greater than/is less than the current limit, and drive control chip C controls first N channel MOS pipe Q1 and cuts-off/switches on, when drive control chip C detects sampling resistor R's reverse current, control second N channel MOS pipe Q2 cuts off, otherwise switches on.

Referring to fig. 1, as a detail of further implementation of this embodiment, the driving control chip C employs a chip L TC4364-2, a chip L TC4364-2 is a surge suppressor having an ideal diode controller, and can accurately monitor an over-voltage state and an under-voltage state of an input power supply, specifically, a pin L TC4364-2 HGATE is connected to a first gate G1 of a first N-channel MOS transistor Q1, a pin DGATE is connected to a second gate G2 of a second N-channel MOS transistor Q2, a pin SENSE is connected to a sampling resistor R input, a pin OUT is connected to a sampling resistor R output, a pin SOURCE is connected to a first SOURCE S1 of the first N-channel MOS transistor Q1 and a second SOURCE S2 of the second N-channel MOS transistor Q2, a first SOURCE S1 of the first N-channel MOS transistor Q1 is connected to a second SOURCE S2 of the second N-channel MOS transistor Q2, a first SOURCE of the first N-channel MOS transistor Q1 is connected to a first SOURCE S638, a second drain of the second N-channel MOS transistor Q638 is connected to a second drain MOS transistor R638.

The chip L TC4364-2 is externally connected with a sampling resistor R, so that a current limit value can be adjusted, protection effect against short circuit and excessive load current can be provided, during overcurrent, the voltage of a pin HGATE is adjusted to limit the current detection voltage between a pin SENSE and a pin OUT to different values, when the voltage of the pin OUT is higher than 2.5V, the chip L TC4364-2 limits the voltage between the pin SENSE and the pin OUT to 50mV, the current limit value is the quotient of 50mV and the resistance value of the sampling resistor R, when the output current is higher than the current limit value, the pin HGATE controls a first N-channel MOS tube Q1 to be cut off, the circuit can prevent damage a power module E due to overcurrent, when the voltage of the pin OUT is lower than 1.5V, the chip L TC4364-2 limits the voltage between the pin SENSE and the pin OUT to 25mV, so as to provide additional protection when the output short circuit is short circuit, when reverse current is detected between the pin SENSE and the pin OUT, the chip L TC4364-2 transmits the voltage of the pin SENSE to the pin SENSE, and controls the second N-channel MOS tube to be cut off, and prevent the reverse current.

As a further implementation detail of this embodiment, the power module E employs an AC-DC/DC-DC converter according to the input AC/DC power.

Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.

Claims (4)

1. An alternating current-direct current switching control system is characterized in that: comprises a power supply module (E) and a detection control module,

the power supply module (E) is used for converting input current into direct current required by a load, and the input current passes through the power supply module (E) and is respectively output by the positive output end (N) and the negative output end (L);

the detection control module comprises a drive control chip (C), and further comprises a sampling resistor (R), a first N-channel MOS tube (Q1) and a second N-channel MOS tube (Q2) which are connected in series, wherein a feedback signal of the sampling resistor (R) is fed back to the drive control chip (C) to control the cut-off/conduction of the first N-channel MOS tube (Q1) or the second N-channel MOS tube (Q2).

2. The ac-dc switching control system according to claim 1, wherein: the driving control chip (C) receives the output current fed back by the sampling resistor (R) and compares the output current with the current limit value in the driving control chip (C), the output current is larger than or smaller than the current limit value, and the driving control chip (C) controls the first N-channel MOS tube (Q1) to be switched off/on;

when the drive control chip (C) detects the reverse current of the sampling resistor (R), the second N-channel MOS tube (Q2) is controlled to be cut off, and on the contrary, the second N-channel MOS tube is controlled to be switched on.

3. The AC/DC switching control system according to claim 2, wherein said driving control chip (C) is a chip L TC4364-2, a chip L TC4364-2 pin HGATE is connected to a first gate (G1) of a first N-channel MOS transistor (Q1), a pin DGATE is connected to a second gate (G2) of a second N-channel MOS transistor (Q2), a pin SENSE is connected to an input terminal of a sampling resistor (R), a pin OUT is connected to an output terminal of the sampling resistor (R), a pin SOURCE is connected to a first SOURCE (S1) of the first N-channel MOS transistor (Q1) and a second SOURCE (S2) of the second N-channel MOS transistor (Q2), a first SOURCE (S1) of the first N-channel MOS transistor (Q1) is connected to a second SOURCE (S2) of the second N-channel MOS transistor (Q2), a first drain (Q5848) of the first N-channel MOS transistor (Q1) is connected to an output terminal of a first N-channel MOS transistor (Q2 6), and a drain (D58R) is connected to an input terminal of the second N-channel MOS 2.

4. A.c/d.c switching control system according to any one of claims 1 to 3, characterized in that: the power supply module (E) is an AC-DC converter or a DC-DC converter.

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