CN210985632U - Multi-output short-circuit protection circuit - Google Patents

Abstract

The utility model discloses a multiplexed output short-circuit protection circuit, multiplexed output short-circuit protection circuit includes power module, input winding and a plurality of output winding, and power module is used for supplying power to the input winding, and the output winding is used for coupling the power signal of input winding transmission and keeps apart power signal to corresponding load output; the short circuit detection circuits are used for adjusting the output short circuit control signals according to the isolated power supply signals output by the corresponding output windings; and the short-circuit protection circuit is used for adjusting the power supply control signal output to the power supply module according to the short-circuit control signals output by all the short-circuit detection circuits so as to control the power supply state of the power supply module to the input winding. Through the technical scheme of the utility model, when effectively having reduced the cost that realizes the output multichannel isolation power, realized keeping apart the short-circuit protection of power output branch road to each way, reduced the probability that the device was burnt out among the multichannel isolation power signal output line.

Description

Multi-output short-circuit protection circuit

Technical Field

The embodiment of the utility model provides a relate to integrated circuit technical field, especially relate to a multiplexed output short-circuit protection circuit.

Background

With the continuous development of electronic technology, the integration degree of equipment in each industry is higher and higher, and a single board or equipment sometimes needs different isolated power supplies to supply electric energy, so that the application of integrating a plurality of isolated power supplies in the single board or equipment is more and more common.

At present, a plurality of ready-made isolation power supply modules are adopted for outputting multipath isolation power supply signals, but the isolation power supply modules are expensive, so that the technical cost for outputting the multipath isolation power supply signals is increased undoubtedly, in addition, loads connected with different isolation power supply signal output branches are short-circuited difficultly, a large abrupt current is generated easily in the short-circuit process, and a large short-circuit power consumption can cause the burning of devices in a multipath isolation power supply signal output circuit to influence the normal operation of equipment.

SUMMERY OF THE UTILITY MODEL

In view of this, the embodiment of the utility model provides a multiplexed output short-circuit protection circuit has effectively reduced when realizing the cost that the power was kept apart to the output multichannel, has realized keeping apart the short-circuit protection of power output branch road to each way, has reduced the probability that the device was burnt out among the multichannel isolation power signal output circuit.

The embodiment of the utility model provides a multiplexed output short-circuit protection circuit, include:

the power supply module is used for supplying power to the input winding, and the output winding is used for coupling a power signal transmitted by the input winding and outputting an isolated power signal to a corresponding load;

the short-circuit detection circuits are used for adjusting the output short-circuit control signals according to the corresponding isolated power supply signals output by the output windings;

and the short-circuit protection circuit is used for adjusting a power supply control signal output to the power supply module according to the short-circuit control signals output by all the short-circuit detection circuits so as to control the power supply state of the power supply module to the input winding.

Further, the short detection circuit includes:

the first switch circuit is used for adjusting the output first switch control signal according to the received isolation power supply signal output by the corresponding output winding;

and the second switch circuit is used for adjusting the output short-circuit control signal according to the received first switch control signal.

Further, the first switching circuit includes:

the first end of the first voltage division device is connected to the isolation power supply signal, the second end of the first voltage division device is electrically connected with the first end of the second voltage division device, and the second end of the second voltage division device is connected to a first setting power supply signal;

a control end of the first switching device is electrically connected with a second end of the first voltage divider device, a first end of the first switching device is connected to the first set power signal, and a second end of the first switching device is used for outputting the first switching control signal;

the second switching circuit includes:

a first end of the light emitting device is connected to a second set power supply signal, and a second end of the light emitting device is connected to the first switch control signal;

and a first end of the photosensitive device is connected to the first set power supply signal, and a second end of the photosensitive device is used for outputting the short circuit control signal.

Further, the short-circuit protection circuit includes:

and the third switch circuit is used for adjusting the first power supply control signal output to the power supply module according to the received short circuit control signal.

Further, the third switching circuit includes:

and the control end of the third switching device is connected with the short-circuit control signal, the first end of the third switching device is connected with a first set power supply signal, and the second end of the third switching device is electrically connected with the first power supply control end of the power supply module and outputs the first power supply control signal.

Further, the third switching circuit further includes:

and a first end of the first capacitive reactance device is connected to the first set power supply signal, and a second end of the first capacitive reactance device is electrically connected with a control end of the third switching device.

Further, the short-circuit protection circuit further includes:

and the fourth switching circuit is used for adjusting a second power supply control signal output to the power supply module according to the received first power supply control signal.

Further, the fourth switching circuit includes:

a control end of the fourth switching device is connected to the first power supply control signal, and a first end of the fourth switching device is connected to a first set power supply signal;

and the control end of the fifth switching device is electrically connected with the second end of the fourth switching device, the first end of the fifth switching device is electrically connected with the power supply end of the power supply module, and the second end of the fifth switching device is electrically connected with the second power supply control end of the power supply module and outputs the second power supply control signal.

Further, the power supply module is configured to output a power-on signal through the power-on terminal when detecting that a voltage of a second power supply control signal received by the second power supply control terminal changes to a set voltage;

the short-circuit protection circuit further includes:

and the power-on circuit is used for powering on the second power supply control end of the power supply module according to the received power-on signal.

Further, the power-up circuit includes:

a first end of the third voltage divider is connected to the power-on signal, and a second end of the third voltage divider is electrically connected with a control end of the fourth switching device;

and a first end of the second capacitive reactance device is electrically connected with a control end of the fourth switching device, and a second end of the second capacitive reactance device is connected to the first setting power supply signal.

The embodiment of the utility model provides a multiplexed output short-circuit protection circuit, set up multiplexed output short-circuit protection circuit including power module, input winding and a plurality of output winding, power module is used for supplying power to input winding, output winding is used for coupling the power signal of input winding transmission and exports the isolation power signal to corresponding load, utilize input winding and output winding to form transformer structure promptly, the cost of realizing output multichannel isolation power is effectively reduced to adopting a plurality of isolation power module drive different loads directly, and set up multiplexed output short-circuit protection circuit and include a plurality of short-circuit detection circuit and a short-circuit protection circuit, and a plurality of short-circuit detection circuit are used for adjusting the short-circuit control signal of output according to the isolation power signal of corresponding output winding output, short-circuit protection circuit is used for adjusting the power supply control signal of output to power module according to the short-circuit control signal of all short-circuit detection circuit output, the power supply state of the power supply module to the input winding is controlled, the short-circuit detection circuit can accurately detect whether the load electrically connected with each output winding is short-circuited or not when the load electrically connected with the output windings is short-circuited, and then the power supply module is controlled to stop supplying power to the input winding when the load electrically connected with any output winding is short-circuited through the short-circuit protection circuit, namely a power supply circuit of the power supply module is cut off, so that the short-circuit protection of each isolated power supply output branch is realized, and the probability that devices in a multi-path isolated power supply signal output circuit are burnt is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments or the background art of the present invention, the drawings required to be used in the description of the embodiments or the background art will be briefly introduced below, and it is obvious that the drawings in the following description are schematic diagrams of some embodiments of the present invention, and for those skilled in the art, other solutions can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a multiple output short-circuit protection circuit according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a specific circuit structure of a short-circuit detection circuit according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a specific circuit structure of a short-circuit protection circuit according to an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures. Throughout this specification, the same or similar reference numbers refer to the same or similar structures, elements, or processes. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

Fig. 1 is a schematic structural diagram of a multiple output short-circuit protection circuit provided in an embodiment of the present invention. As shown in fig. 1, the multi-output short-circuit protection circuit includes a power supply module 1, an input winding 2, and a plurality of output windings 3, where the power supply module 1 is configured to supply power to the input winding 2, and the output windings 3 are configured to couple a power signal transmitted by the input winding 2 and output an isolated power signal to a corresponding load (not shown in fig. 1). The multiple-output short-circuit protection circuit further includes a plurality of short-circuit detection circuits 4 and a short-circuit protection circuit 5, fig. 1 exemplarily shows that the multiple-output short-circuit protection circuit includes three output windings 3, a corresponding multiple-output short-circuit protection circuit includes three short-circuit detection circuits 4, the short-circuit detection circuit 4 is configured to adjust an output short-circuit control signal according to an isolated power signal output by the corresponding output winding 3, and the short-circuit protection circuit 5 is configured to adjust a power supply control signal output to the power supply module 1 according to short-circuit control signals output by all the short-circuit detection circuits 4, so as to control a power supply state of the power supply module 1 to the input winding 2.

Specifically, power module 1 is used for supplying power to input winding 2, power module 1 can be for the power supply chip, power module 1 lets in the power supply signal to input winding 2, the power signal of 3 coupling input winding 2 transmissions of output winding and to the load output isolation power signal that corresponds, can set up input winding 2 and output winding 3 and form the transformer structure, like this, for directly adopting a plurality of loads that keep apart power module drive difference, need not additionally to adopt and keep apart power module, the cost of realizing output multichannel isolation power has effectively been reduced.

In addition, each output winding 3 is provided with a corresponding short-circuit detection circuit 4, if a short-circuit problem occurs to a load electrically connected with any one output winding 3, the voltage of an isolated power supply signal output by the corresponding output winding 3 changes, a port B of the short-circuit detection circuit 4 is connected to the isolated power supply signal output by the corresponding output winding 3, the short-circuit detection circuit 4 detects the change of the voltage of the corresponding isolated power supply signal and adjusts the voltage of the output short-circuit control signal, all ports A of the short-circuit detection circuit 4 for outputting the short-circuit control signal are connected to the short-circuit protection circuit 5 after being short-circuited, so that the change of the voltage of any one short-circuit control signal can be detected by the short-circuit protection circuit 5, and then the output power supply control signal is adjusted when the short-circuit condition is confirmed by the short-circuit protection circuit 5 to control the power supply module 1 not, the short-circuit protection of each isolated power supply output branch is realized, and the probability that devices in a multi-path isolated power supply signal output circuit are burnt is further reduced.

Fig. 2 is a specific circuit structure diagram of a short-circuit detection circuit that embodiment of the present invention provides, combine fig. 1 and fig. 2, short-circuit detection circuit 4 includes first switch circuit 41 and second switch circuit 42, first switch circuit 41 is used for adjusting the first switch control signal of output according to the received isolation power signal that corresponds output winding 3 output, and second switch circuit 42 is used for adjusting the short-circuit control signal of output according to the received first switch control signal.

Specifically, for example, the first short-circuit detection circuit 4 is taken as an example, the first switch circuit 41 in the short-circuit detection circuit 4 receives the isolated power signal output by the first output winding 3, when a load electrically connected to the first output winding 3 is short-circuited, the voltage of the isolated power signal received by the port B of the first switch circuit 41 changes, which causes the switching state of the first switch circuit 41 to change, the level of the first switch control signal output by the first switch circuit 41 changes, which further causes the switching state of the second switch circuit 42 to change, the level of the short-circuit control signal output by the second switch circuit 42 changes, and the short-circuit protection circuit 5 detects the change in the level of the short-circuit control signal, which can control the power supply module 1 to no longer supply power to the input winding 2, so as to implement short-circuit protection.

Optionally, with reference to fig. 1 and fig. 2, the first switch circuit 41 includes a first voltage divider R1, a second voltage divider R2, and a first switch device K1, a first end of the first voltage divider R1 is connected to an isolated power signal, a second end of the first voltage divider R1 is electrically connected to a first end of the second voltage divider R2, a second end of the second voltage divider R2 is connected to a first set power signal, the first set power signal may be a ground signal, for example, the first voltage divider R1 and the second voltage divider R2 may be resistive elements, for example, to divide the connected isolated power signal, and when a voltage of the isolated power signal changes, a voltage of a divided voltage signal output by a voltage dividing node also changes.

A control terminal of the first switching device K1, i.e., a right port of K1 in fig. 2, is electrically connected to a second terminal of the first voltage divider R1, a first terminal of the first switching device K1 is connected to a first set power signal, e.g., a ground signal, a second terminal of the first switching device K1 is configured to output a first switching control signal, the first switching device K1 may be, for example, an insulated gate field effect transistor, i.e., an MOS transistor, or a triode, i.e., a BJT, or the first switching device K1 may be, as shown in fig. 2, a diode with a control function, and the diode is turned on or off according to a voltage division signal input from the right control terminal, so as to adjust the level of the first switching control signal output by the first switching circuit 41.

The second switch circuit 42 includes a light emitting device D1 and a photo sensor T1, a first terminal of the light emitting device D1 is connected to a second set power signal, such as a VDD signal, a second terminal of the light emitting device D1 is connected to a first switch control signal, i.e., is electrically connected to a second terminal of the first switch device K1, a first terminal of the photo sensor T1 is connected to a first set power signal, such as a ground signal, and a second terminal of the photo sensor T1 is configured to output a short circuit control signal. The light emitting device D1 may be, for example, a light emitting diode, the photosensor T1 may be, for example, a phototransistor, the light emitting device D1 controls itself to turn on or off according to a first switch control signal output by the first switch circuit 41, the light emitting device D1 emits light when turned on, the photosensor T1 conducts light when turned on, a first setting power signal connected to a first end of the photosensor T1 may be set to be a ground signal, a short circuit control signal output by a second end of the photosensor T1 is a low level signal, conversely, if the light emitting device D1 is turned off and does not emit light, a short circuit control signal output by a second end of the photosensor T1 is a high level signal, and the short circuit protection circuit 5 detects a change in level of the short circuit control signal, and may control the power supply module 1 to no longer supply power to the input winding 2, thereby implementing short circuit protection.

Fig. 3 is a schematic diagram of a specific circuit structure of a short-circuit protection circuit according to an embodiment of the present invention. With reference to fig. 1 to fig. 3, the short-circuit protection circuit 5 includes a third switch circuit 51, where the third switch circuit 51 is configured to adjust a first power supply control signal output to the power supply module 1, that is, a first power supply control signal output through a first power supply control terminal COM, according to a received short-circuit control signal, that is, a short-circuit control signal input through a port a, the port a of the third switch circuit 51 is electrically connected to the short-circuited ports a of all the short-circuit detection circuits 4, the third switch circuit 51 may adjust the level of the first power supply control signal output to the power supply module 1 according to the level of the short-circuit control signal received through the port a, and the power supply module 1 controls whether to supply power to the input winding 2 when the level of the received first power supply control signal is different.

Optionally, with reference to fig. 1 to fig. 3, the third switching circuit 51 includes a third switching device K3, a control terminal of the third switching device K3 receives the short-circuit control signal, a first terminal of the third switching device K3 receives a first set power signal, for example, a ground signal, and a second terminal of the third switching device K3 is electrically connected to the first power supply control terminal COM of the power supply module 1 and outputs the first power supply control signal.

Specifically, the third switching device K3 may be an insulated gate field effect transistor, that is, a MOS transistor, or a triode, that is, a BJT transistor, a control terminal of the third switching device K3 controls whether a first terminal and a second terminal of the third switching device K3 are connected according to a received short circuit control signal, a first setting power signal connected to the first terminal of the third switching device K3 may be, for example, a ground signal, and if the third switching device K3 is connected, the first power supply control signal output from the second terminal of the third switching device K3 to the first power supply control terminal COM of the power supply module 1 is a low level signal. If the third switching device K3 is turned off, the first power supply control signal output from the second terminal of the third switching device K3 to the first power supply control terminal COM of the power supply module 1 is a high level signal. Whether the load has different levels of the short-circuit control signal output by the short-circuit detection circuit 4 corresponding to the short-circuit condition or not can be set, and then the switching state of the third switching device K3 is controlled to be different, and when the first power supply control end COM of the power supply module 1 receives a short-circuit effective signal (a high level signal or a low level signal), power is no longer supplied to the input line group, so that short-circuit protection is realized.

Optionally, with reference to fig. 1 to fig. 3, the third switching circuit 51 further includes a first capacitive reactance device C1, a first terminal of the first capacitive reactance device C1 is connected to a first set power signal, such as a ground signal, and a second terminal of the first capacitive reactance device C1 is electrically connected to the control terminal of the third switching device K3.

Specifically, the first capacitive reactance device C1 may be a capacitive element, the first capacitive reactance device C1 is connected to the ground signal GND to the control terminal of the third switching device K3, and the second terminal of the photosensor T1 in the short-circuit detection circuit 4 for outputting the short-circuit control signal may also be connected to the second power supply control terminal POW1 of the power supply module 1, i.e., the power supply terminal of the power supply module, through a resistive element. When there is a short circuit in the load connected to the output winding 3, the corresponding voltage division signal output to the first switching device K1 is a low level signal, the first switching device K1 is turned off, the light emitting device D1 in the optical coupler does not emit light, and the first end and the second end of the photosensitive device T1 are disconnected. When power is turned on, that is, the power supply module 1 starts to supply power to the input winding 2, since the voltage of the isolated power signal output by the output winding 3 is close to 0V, as described above in relation to the short-circuit situation, the short-circuit situation does not occur during power-on, but the short-circuit protection is also triggered by mistake.

The embodiment of the utility model provides a still include first capacitive reactance device C1 through setting up third switch circuit 51, the first end of first capacitive reactance device C1 inserts first settlement power signal, the second end of first capacitive reactance device C1 is connected with third switch device K3's control end electricity, make the electric potential of third switch device K3's control end slowly rise, can not directly trigger short-circuit protection when last electricity is built, and then avoided going up the problem that the short-circuit protection that leads to was established to the electricity triggers by mistake.

Optionally, with reference to fig. 1 to 3, the short-circuit protection circuit 5 further includes a fourth switch circuit 52, where the fourth switch circuit 52 is configured to adjust the second power supply control signal output to the power supply module 1 according to the received first power supply control signal, that is, the signal output to the first power supply control terminal COM, when there is a short circuit condition in a load electrically connected to the output winding 3, the power supply module 1 is controlled to stop supplying power by the first power supply control signal, that is, the enable signal of the power supply module, and at the same time, the second power supply control signal output by the fourth switch device K4, that is, the signal output to the second power supply control terminal POW1 of the power supply module 1 can also control the power supply module 1 to stop supplying power, and the accuracy of the short-circuit protection function is improved by using a dual short-circuit protection mechanism.

Optionally, with reference to fig. 1 to fig. 3, the fourth switching circuit 52 includes a fourth switching device K4 and a fifth switching device K5, a control terminal of the fourth switching device K4 is connected to the first power supply control signal, a first terminal of the fourth switching device K4 is connected to the first setting power signal, a control terminal of the fifth switching device K5 is electrically connected to a second terminal of the fourth switching device K4, a first terminal of the fifth switching device K5 is electrically connected to the upper power terminal POW of the power supply module 1, and a second terminal of the fifth switching device K5 is electrically connected to the second power supply control terminal POW1 of the power supply module 1 and outputs the second power supply control signal.

Specifically, the fourth switching device K4 and the fifth switching device K5 may be insulated gate field effect transistors, that is, MOS transistors, or triodes, that is, BJT transistors, and when the first power supply control signal accessed by the fourth switching device K4 corresponds to whether the load has a short circuit, the levels are different, so that the switching state of the fourth switching device K4 is different, the levels of the switch control signals accessed by the control end of the fifth switching device K5 are also different, the switching state of the fifth switching device K5 is different, the fifth switching device K5 may be controlled to turn off when the short circuit exists, the upper power supply end POW of the power supply module 1 is disconnected from the second power supply control end POW1, the second power supply control signal at the second power supply control end POW1 is a low level signal, and the power supply of the power supply module 1 stops supplying power.

Alternatively, referring to fig. 1 to 3, the power supply module 1 is configured to output a power-on signal through the power-on terminal POW when detecting that the voltage of the second power supply control signal received by the second power supply control terminal POW1 changes to a set voltage, the short-circuit protection circuit 5 further includes a power-on circuit 53 configured to power on the second power supply control terminal POW1 of the power supply module 1 according to the received power-on signal, and the power-on circuit 53 may include a third voltage divider R3 and a second capacitive reactance device C2, a first terminal of the third voltage divider R3 is connected to the power-on signal, a second terminal of the third voltage divider R3 is electrically connected to a control terminal of the fourth switch K4, a first terminal of the second capacitive reactance device C2 is electrically connected to a control terminal of the fourth switch K4, and a second terminal of the second capacitive reactance device C2 is connected to a first set power supply signal, such as a ground signal.

Specifically, since the pin corresponding to the second power supply control terminal POW1 of the power supply module 1 has a certain capacitance, when the voltage of the second power supply control signal received by the second power supply control terminal POW1 is reduced to 0V after a short circuit occurs, the short circuit protection process is ended, the power supply module 1 outputs the power-on signal through the power-on terminal POW when detecting that the voltage of the second power supply control signal received by the second power supply control terminal POW1 is changed to a set voltage, for example, 0V, that is, the power supply module 1 is powered on again, the power-on signal output by the power-on terminal POW is communicated with the second capacitive reactance device C2 through the third voltage divider device R3, so that the fourth switching device K4 turned off during short circuit protection is turned on again, and further the fifth switching device K5 is turned on, the power supply terminal POW of the power supply module 1 is communicated with the second power supply control terminal POW1 of the power supply module 1, and the second power supply control terminal POW1 receives the second power supply control signal with a high level, power module 1 can continue to supply power to input winding 2, and whole circuit can carry out short-circuit protection when the short circuit takes place so that the power supply line disconnection between power module 1 and the input winding 2 promptly, can utilize power module 1 inside feedback mechanism to go up power module 1 automatically after the outage again, realizes hiccup short-circuit protection.

The working principle of the multi-output short-circuit protection circuit is described in the following with reference to fig. 1 to 3 as a whole:

the relationship between all the short-circuit detection circuits 4 is "or" off, that is, when any one short-circuit detection branch detects that the corresponding load has a short-circuit condition, a short-circuit control signal for controlling the short-circuit protection circuit 5 to perform short-circuit protection is output.

The short-circuit detection circuit 4 firstly detects the voltage change of the accessed isolation power supply signal through the voltage divider, if the load is short-circuited, the voltage of the isolation power supply signal can be reduced, when the voltage of the isolation power supply signal is reduced to be less than or equal to a set detection voltage, the first switch device K1 can be controlled to be switched off, the light emitting device D1 is controlled not to emit light, the photosensitive device T1 outputs a high level, the third switch device is controlled to be switched on, and the first power supply control end COM of the power supply module receives a first power supply control signal of a low level. Meanwhile, the fourth switching device K4 is turned off under the action of the first power supply control signal with low level, the fifth switching device K5 is turned off, and the POW1 receives the second power supply control signal with low level, so that the short-circuit protection is realized by using a double short-circuit protection mechanism.

In addition, the multi-output short-circuit protection circuit can also realize overcurrent protection, for example, when the current value of the isolated power supply signal output by the output winding 3 is too large, the divided voltage of the first voltage divider device R1 and the second voltage divider device R2 can be reduced, and the overcurrent protection can be realized by utilizing the short-circuit protection principle.

It should be noted that the embodiment of the utility model provides a switch to among the multiplexed output short-circuit protection circuit is that high level control switches on or low level control switches on and not inject, can set up corresponding switch effective signal according to the function that realizes short-circuit protection and be high level signal or low level signal.

The embodiment of the utility model provides an utilize input winding and output winding to form the transformer structure, effectively reduced the cost of realizing output multichannel isolation power for the different load of direct adoption a plurality of isolation power module drives, when having realized that the load that output winding connects has the short circuit condition, whether the short circuit detection circuit can accurately detect the load that each output winding electricity is connected has the condition of short circuit, and then control power supply module no longer to the input winding power supply when the load that arbitrary one output winding electricity is connected has the short circuit condition through the short circuit protection circuit, cut off power module's power supply line promptly, the short circuit protection to each way isolation power output branch road has been realized, the probability that the device was burnt out in the multichannel isolation power signal output circuit has been reduced.

It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments illustrated herein, but is capable of various obvious modifications, rearrangements and substitutions without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims (10)

1. A multi-output short-circuit protection circuit, comprising:

the power supply module is used for supplying power to the input winding, and the output winding is used for coupling a power signal transmitted by the input winding and outputting an isolated power signal to a corresponding load;

the short-circuit detection circuits are used for adjusting the output short-circuit control signals according to the corresponding isolated power supply signals output by the output windings;

and the short-circuit protection circuit is used for adjusting a power supply control signal output to the power supply module according to the short-circuit control signals output by all the short-circuit detection circuits so as to control the power supply state of the power supply module to the input winding.

2. The multi-output short-circuit protection circuit of claim 1, wherein the short-circuit detection circuit comprises:

the first switch circuit is used for adjusting the output first switch control signal according to the received isolation power supply signal output by the corresponding output winding;

and the second switch circuit is used for adjusting the output short-circuit control signal according to the received first switch control signal.

3. The multi-output short-circuit protection circuit according to claim 2, wherein the first switching circuit comprises:

the first end of the first voltage division device is connected to the isolation power supply signal, the second end of the first voltage division device is electrically connected with the first end of the second voltage division device, and the second end of the second voltage division device is connected to a first setting power supply signal;

a control end of the first switching device is electrically connected with a second end of the first voltage divider device, a first end of the first switching device is connected to the first set power signal, and a second end of the first switching device is used for outputting the first switching control signal;

the second switching circuit includes:

a first end of the light emitting device is connected to a second set power supply signal, and a second end of the light emitting device is connected to the first switch control signal;

and a first end of the photosensitive device is connected to the first set power supply signal, and a second end of the photosensitive device is used for outputting the short circuit control signal.

4. The multi-output short-circuit protection circuit of claim 1, wherein the short-circuit protection circuit comprises:

and the third switch circuit is used for adjusting the first power supply control signal output to the power supply module according to the received short circuit control signal.

5. The multi-output short-circuit protection circuit according to claim 4, wherein the third switching circuit comprises:

and the control end of the third switching device is connected with the short-circuit control signal, the first end of the third switching device is connected with a first set power supply signal, and the second end of the third switching device is electrically connected with the first power supply control end of the power supply module and outputs the first power supply control signal.

6. The multi-output short-circuit protection circuit according to claim 5, wherein the third switching circuit further comprises:

and a first end of the first capacitive reactance device is connected to the first set power supply signal, and a second end of the first capacitive reactance device is electrically connected with a control end of the third switching device.

7. The multi-output short-circuit protection circuit according to any one of claims 4-6, further comprising:

and the fourth switching circuit is used for adjusting a second power supply control signal output to the power supply module according to the received first power supply control signal.

8. The multi-output short-circuit protection circuit according to claim 7, wherein the fourth switching circuit comprises:

a control end of the fourth switching device is connected to the first power supply control signal, and a first end of the fourth switching device is connected to a first set power supply signal;

and the control end of the fifth switching device is electrically connected with the second end of the fourth switching device, the first end of the fifth switching device is electrically connected with the power supply end of the power supply module, and the second end of the fifth switching device is electrically connected with the second power supply control end of the power supply module and outputs the second power supply control signal.

9. The multi-output short-circuit protection circuit of claim 8, wherein the power supply module is configured to output a power-up signal through the power-up terminal when detecting that a voltage of a second power-supply control signal received by the second power-supply control terminal changes to a set voltage;

the short-circuit protection circuit further includes:

and the power-on circuit is used for powering on the second power supply control end of the power supply module according to the received power-on signal.

10. The multi-output short-circuit protection circuit of claim 9, wherein the power-up circuit comprises:

a first end of the third voltage divider is connected to the power-on signal, and a second end of the third voltage divider is electrically connected with a control end of the fourth switching device;

and a first end of the second capacitive reactance device is electrically connected with a control end of the fourth switching device, and a second end of the second capacitive reactance device is connected to the first setting power supply signal.

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