Short circuit protection circuit, power supply controller and satellite

Abstract

The embodiment of the utility model discloses a short-circuit protection circuit, a power supply controller and a satellite, a power supply branch comprises a current detection module and an overcurrent protection module, and a control module determines the power supply current of the power supply branch according to a current detection signal detected by the current detection module. And when the power supply current exceeds the preset current threshold value of the electronic fuse, the electronic fuse is controlled to be disconnected, the connection between the power supply connected with the power supply branch and the cable is cut off in time, and the influence of short circuit and overcurrent of the power distribution cable on the power supply is avoided. Moreover, the overcurrent protection module further comprises a first fuse connected in series with the electronic fuse, and the overcurrent protection module and the first fuse are backups for each other, so that when one of the two is in fault, the other one can still carry out overcurrent protection, and the disconnection between the power supply and the power distribution cable is further ensured when the power distribution cable is in overcurrent. The influence of short circuit of the distribution cable on the power supply is further avoided, and the power supply reliability is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to power protection technical field especially relates to a short circuit protection circuit, power controller and satellite. BACKGROUND

[0002] Load distribution plays a vital role in the whole satellite power system, and is an important guarantee for the normal operation of the satellite.

[0003] The load and the power supply are connected through the distribution cable, and the short circuit of the distribution cable will affect the power supply, causing the power supply to fail and affecting the power supply reliability.

[0004] Therefore, how to protect the power supply when the distribution cable is short-circuited becomes a problem to be solved. UTILITY MODEL CONTENTS

[0005] The utility model provides a kind of short circuit protection circuit, power controller and satellite, to disconnect the connection of power supply and distribution cable under the condition of distribution cable short circuit, and then protect power supply, improve power supply reliability.

[0006] According to an aspect of the utility model, a kind of short circuit protection circuit is provided, including at least one power supply branch, power supply branch includes power input terminal, power output terminal, and distribution switch and overcurrent protection module connected in series at power input terminal and power output terminal;Power input terminal is connected with power supply, and power output terminal is connected with distribution cable;Overcurrent protection module includes the first fuse and electronic fuse arranged in series;Power supply branch further includes current detection module, and current detection module is used to output current detection signal according to the current of power supply branch;

[0007] Short circuit protection circuit further includes control module, control module is connected with distribution switch, current detection module and electronic fuse respectively, for controlling the on state of distribution switch, and according to current detection signal determines the power supply current of power supply branch, and when power supply current exceeds the preset current threshold of electronic fuse, control electronic fuse disconnects.

[0008] Optionally, overcurrent protection module includes at least two first fuses, and at least two first fuses are connected in parallel.

[0009] Optionally, power output terminal is connected with one end of distribution cable, and the other end of distribution cable is connected with load;

[0010] Control module is further connected with load, for configuring the preset current threshold of electronic fuse in the power supply branch connected with load according to the power parameter of load.

[0011] Optionally, the short-circuit protection circuit comprises a first power supply branch and a second power supply branch, the first power supply branch comprises a first power input end and a first power output end, the second power supply branch comprises a second power input end and a second power output end, the first power input end is connected with a first power supply, the second power input end is connected with a second power supply, the first power supply and the second power supply have different output voltages; the first power output end is connected with a first load, and the second power output end is connected with a second load.

[0012] Optionally, the power input end comprises a positive input end and a negative input end, the power output end comprises a positive output end and a negative output end, the power distribution switch and the overcurrent protection module are connected in series between the positive input end and the positive output end, and the current detection module is connected with the negative input end and the negative output end respectively.

[0013] Optionally, the current detection module comprises an operational amplifier, a resistor, a capacitor and a stabilizing tube, the non-inverting input end of the operational amplifier is connected with the negative input end, the inverting input end of the operational amplifier is connected with the negative output end, the output end of the operational amplifier is connected with the first end of the resistor, the second end of the resistor is connected with the control module, and the second end of the resistor is also connected with the control module through the parallelly connected stabilizing tube and capacitor.

[0014] Optionally, the short-circuit protection circuit further comprises a power supply and a selection switch, the power supply comprises a main power supply and a backup power supply, the main power supply and the backup power supply are connected with the power input end respectively, the selection switch is connected with the main power supply, the backup power supply and the control module respectively, the control module is used for selecting the main power supply or the backup power supply to supply power to the power input end through the selection switch, and / or the load connected with the power supply branch comprises a second fuse inside, and the second fuse is connected with the power distribution cable.

[0015] Optionally, the control module comprises a satellite lower computer, and the load connected with the power distribution cable comprises a single-machine device in the satellite.

[0016] According to another aspect of the present application, a power supply controller is provided, which comprises the short-circuit protection circuit of any embodiment of the present application.

[0017] According to still another aspect of the present application, a satellite is provided, which comprises the power supply controller of any embodiment of the present application.

[0018] The short-circuit protection circuit, the power supply controller and the satellite provided by the embodiment of the utility model, through setting up the power supply branch including current detection module, overcurrent protection module, control module determines the power supply current of the power supply branch according to the current detection signal detected by the current detection module, and when the power supply current exceeds the preset current threshold of the electronic fuse, controls the electronic fuse to disconnect, timely cuts off the connection between the power supply and the cable connected by the power supply branch, avoids the influence caused by the short-circuit overcurrent of the power distribution cable to the power supply.

[0019] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the utility model, nor is it used to limit the scope of the utility model. Other features of the utility model will become easily understood through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed to be used in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0021] Figure 1 It is a structure schematic view of a short-circuit protection circuit provided by the embodiment of the utility model;

[0022] Figure 2 It is a structure schematic view of another short-circuit protection circuit provided by the embodiment of the utility model;

[0023] Figure 3 It is a structure schematic view of another short-circuit protection circuit provided by the embodiment of the utility model;

[0024] Figure 4 It is a structure schematic view of another short-circuit protection circuit provided by the embodiment of the utility model;

[0025] Figure 5 It is a structure schematic view of TPS1HA08-Q1 chip. DETAILED DESCRIPTION

[0026] In order to make the person skilled in the art better understand the technical scheme of the present application, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the present application.

[0027] It should be noted that the terms "first", "second" and the like in the description and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0028] Figure 1 is a structural schematic diagram of a short-circuit protection circuit provided by the embodiments of the present application, referring to Figure 1 The short-circuit protection circuit can be used for the protection of power supply in a satellite. The short-circuit protection circuit comprises at least one power supply branch 100, the power supply branch 100 comprising a power supply input end IN, a power supply output end OUT, and a power distribution switch 10 and an overcurrent protection module 20 connected in series between the power supply input end IN and the power supply output end OUT; the power supply input end IN is connected to a power supply 200, and the power supply output end OUT is connected to a power distribution cable 30; the overcurrent protection module 20 comprises a first fuse 21 and an electronic fuse 22 arranged in series; the power supply branch 100 further comprises a current detection module 40, the current detection module 40 being configured to output a current detection signal according to the current of the power supply branch 100; the short-circuit protection circuit further comprises a control module 50, the control module 50 being connected to the power distribution switch 10, the current detection module 40 and the electronic fuse 22 respectively, and being configured to control the conduction state of the power distribution switch 10, determine the power supply current of the power supply branch 100 according to the current detection signal, and control the electronic fuse 22 to be disconnected when the power supply current exceeds a preset current threshold of the electronic fuse 22.

[0029] Specifically, the power input end IN of the power supply branch 100 is connected with the power supply 200, and the power output end OUT is connected with the power distribution cable 30. Optionally, the power output end OUT is connected with the power distribution cable 30 in a plug-in manner. The power supply can be a DC-DC power supply. The power output end OUT can be connected with the load 300 through the power distribution cable 30, and the load 300 includes single-machine equipment in the satellite, such as an integrated electronic system, a flywheel, a transponder, etc.

[0030] The power supply branch 100 includes the power distribution switch 10, the current detection module 40, and the overcurrent protection module 20. The current detection module 40 includes but is not limited to a current sensor or a telemetry circuit for current detection. The overcurrent protection module 20 includes the first fuse 21 and the electronic fuse 22 in series, wherein the first fuse 21 can be a conventional fuse (non-electronic fuse). The first fuse 21 and the electronic fuse 22 constitute a redundant short-circuit protection structure. In the case that one of them fails, the other can still cut off the connection between the power supply and the power distribution cable 30 when the power supply branch 100 overflows, thereby more effectively protecting the power supply. The power supply branch 100 further includes the control module 50, which can include a single-chip microcomputer or other chip with a control function. For example, the control module 50 can be a satellite's whole-star lower computer. The control module 50 can control the conduction state of the power distribution switch 10 and the conduction state of the electronic fuse 22. When the power distribution switch 10 is turned on, the power supply connected to the power input end IN of the power supply branch 100 outputs power to the power distribution cable 30 through the power distribution switch 10 and the overcurrent protection module 20 through the power output end OUT, thereby supplying power to the load.

[0031] The working process of the short-circuit protection circuit includes: after the control module 50 controls the power distribution switch 10 to close, in the case that the power distribution cable 30 connected to the power supply branch 100 does not appear short-circuit, the current detection module 40 detects that the current in the power supply branch 100 is a normal current, and outputs a first current detection signal to the control module 50. The control module 50 determines that the power distribution cable 30 is working normally according to the first current detection signal, and the first fuse 21 and the electronic fuse 22 are both in the conduction state. In the case that the power distribution cable 30 connected to the power supply branch 100 appears short-circuit, the current detection module 40 detects that the current in the power supply branch 100 is an abnormal short-circuit current, and outputs a second current detection signal to the control module 50. The control module 50 determines that the current in the power supply branch 100 exceeds the preset current threshold of the electronic fuse 22 according to the second current detection signal, thereby controlling the electronic fuse 22 to be disconnected. At the same time, the first fuse 21 will also be blown due to overcurrent, thereby cutting off the connection between the power supply 200 and the power distribution cable 30, preventing the influence of the short-circuit of the power distribution cable 30 on the power supply 200, and improving the power supply reliability.

[0032] The preset current threshold of the electronic fuse 22 can be configured by the control module 50. In this way, the preset current threshold of the electronic fuse 22 can be configured according to the allowed current value of the power distribution cable 30. Optionally, the preset current threshold of the electronic fuse 22 is equal to the maximum current value allowed to pass through the power distribution cable 30.

[0033] The short-circuit protection circuit of the embodiment sets the power supply branch to include the current detection module and the overcurrent protection module. The control module determines the power supply current of the power supply branch according to the current detection signal detected by the current detection module, and controls the electronic fuse to be disconnected when the power supply current exceeds the preset current threshold of the electronic fuse, so as to timely cut off the connection between the power supply and the cable connected by the power supply branch, and avoid the influence of the short-circuit overcurrent of the power distribution cable on the power supply. In addition, the overcurrent protection module further includes the first fuse connected in series with the electronic fuse, and the two are backup for each other. In the case that one of them fails, the other can still perform overcurrent protection, further ensuring that the connection between the power supply and the power distribution cable is disconnected when the power distribution cable overflows, further avoiding the influence of the short-circuit of the power distribution cable on the power supply, and improving the power supply reliability.

[0034] Figure 2 is a structural schematic view of another short-circuit protection circuit provided by the embodiment of the utility model, referring to Figure 2 Optionally, the overcurrent protection module 20 includes at least two first fuses 21, and the at least two first fuses 21 are connected in parallel. In this way, the at least two first fuses 21 are redundantly arranged, so that when one of the first fuses 21 is damaged, the other first fuses 21 can still perform overcurrent protection, further avoiding the influence of the short-circuit of the power distribution cable 30 on the power supply, and improving the power supply reliability.

[0035] Continuing to refer to Figure 1 and Figure 2 Optionally, the power supply output end OUT is connected to one end of the power distribution cable 30, and the other end of the power distribution cable 30 is connected to the load 300; the control module 50 is further connected to the load 300, and is used for configuring the preset current threshold of the electronic fuse 22 in the power supply branch 100 connected to the load 300 according to the power parameter of the load 300.

[0036] Specifically, the power parameter of the load 300 includes a rated power of the load 300. The greater the rated power of the load 300 connected by the power supply branch 100 through the power distribution cable 30, the greater the cross-sectional area of the power distribution cable 30, the greater the current allowed to flow through the power distribution cable 30, and the greater the preset current threshold of the electronic fuse 22 in the power supply branch 100. In this way, the preset current threshold of the electronic fuse 22 can be made to correspond to the rated power of the load 300, that is, the preset current threshold of the electronic fuse 22 corresponds to the current allowed to flow through the power distribution cable 30, so as to ensure that the electronic fuse 22 will not be disconnected when the power distribution cable 30 does not appear a short circuit condition, and the electronic fuse 22 is timely disconnected when the power distribution cable 30 appears a short circuit condition, so as to ensure that the power supply branch 100 normally works when the power distribution cable 30 does not appear a short circuit condition, and the power supply branch 100 is disconnected to protect the power supply when the power distribution circuit appears a short circuit condition.

[0037] In some embodiments, the short circuit protection circuit includes a first power supply branch and a second power supply branch, the first power supply branch includes a first power input end and a first power output end, the second power supply branch includes a second power input end and a second power output end, the first power input end is connected to a first power supply, the second power input end is connected to a second power supply, the output voltages of the first power supply and the second power supply are different; the first power output end is connected to a first load, and the second power output end is connected to a second load. In this way, different power supplies can be set up to meet the voltage requirements of different loads. Moreover, the overcurrent protection module with the redundant structure of the first fuse and the electronic fuse is arranged in the power supply branch connected by the power distribution cable for each load, so as to ensure the reliability of power supply of each power supply branch.

[0038] Figure 3 is a structural schematic diagram of another short circuit protection circuit provided by the embodiment of the present application, referring to Figure 3 Optionally, the power input end includes a positive input end IN+ and a negative input end IN-, the power output end includes a positive output end OUT+ and a negative output end OUT-, the power distribution switch 10 and the overcurrent protection module 20 are connected in series between the positive input end IN+ and the positive output end OUT+, and the current detection module 40 is connected to the negative input end IN- and the negative output end OUT- respectively. In this way, it can be ensured that the current detected by the current detection module 40 is the current of the load 300, rather than the current of the power input end, so as to ensure the accuracy of the current detection signal output by the current detection module 40.

[0039] Continuing to refer to Figure 3Optionally, the current detection module 40 comprises an operational amplifier U1, a resistor R1, a capacitor C1 and a voltage stabilizing tube D1, the non-inverting input end of the operational amplifier U1 is connected with the negative input end IN-, the inverting input end is connected with the negative output end OUT-, the output end of the operational amplifier U1 is connected with the first end of the resistor R1, the second end of the resistor R1 is connected with the control module 50, and the second end of the resistor R1 is further connected with the control module 50 through the voltage stabilizing tube D1 and the capacitor C1 in parallel.

[0040] Specifically, the current detection module 40 can comprise a telemetry circuit, the second end of the second resistor R1 can be connected with a telemetry output end, and the telemetry output end is connected with the control module 50.

[0041] Figure 4 is a structural schematic view of another short-circuit protection circuit provided by the embodiment of the utility model, referring to Figure 4 Optionally, the short-circuit protection circuit further comprises a power supply and a selection switch 60, the power supply comprises a main power supply 310 and a backup power supply 320, and the main power supply 310 and the backup power supply 320 are connected with the power supply input end IN respectively; the selection switch 60 is connected with the main power supply 310, the backup power supply 320 and the control module 50 respectively, and the control module 50 is used for selecting the main power supply 310 or the backup power supply 320 to supply power to the power supply input end IN through the selection switch 60. In this way, the backup of the power supply is used to deal with the failure of the front-end power supply, and the power supply reliability is further ensured.

[0042] In some embodiments, the load 300 internally connected with the power supply branch 100 comprises a second fuse, and the second fuse is connected with the power distribution cable 30. In this way, when the power distribution cable 30 overflows or the current of the load 300 itself is too large, the second fuse will be fused, the influence of the short circuit of the power distribution cable 30 on the load 300 is avoided through the second fuse, and the influence of the short circuit of the load 300 on the front-end power supply is avoided, and the power supply reliability is further improved.

[0043] On the basis of the above-mentioned embodiments, the selection of the electronic fuse is TPS1HA08-Q1 chip, Figure 5 is a structural schematic view of the TPS1HA08-Q1 chip. The power supply pin VBB of the TPS1HA08-Q1 chip is connected with a battery, the output pin VOUT is connected with a power distribution output end, then connected with a load through a power distribution cable, and the grounding pin GND is grounded. When the control module determines that the current in the power supply branch is greater than a preset current threshold according to a current detection signal, a low-level signal is automatically given to the enable pin EN of the TPS1HA08-Q1 chip, the electronic fuse is disabled, and the front-end power supply is protected. In addition, this method can better avoid the influence of single event latch-up on the circuit.

[0044] The utility model embodiment further provides a kind of power controller, the power controller includes the short-circuit protection circuit of any embodiment of the above utility model, with the beneficial effect of the short-circuit protection circuit of any embodiment of the above utility model, not repeat here.

[0045] The utility model embodiment further provides a kind of satellite, and the satellite includes the power controller of the above embodiment of the utility model.

[0046] It should be understood that the steps can be reordered, added, or deleted using the various forms of the flow shown above. For example, the steps described in the utility model can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solutions of the utility model can be achieved, and this document does not limit it here.

[0047] The above specific embodiments do not constitute a limitation on the scope of protection of the utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model shall be included in the scope of protection of the utility model.

Claims

1. A short-circuit protection circuit, characterized by comprising: The power supply branch includes a power input end, a power output end, and a power distribution switch and an overcurrent protection module connected in series between the power input end and the power output end; the power input end is connected to a power supply, and the power output end is connected to a power distribution cable; The overcurrent protection module includes a first fuse and an electronic fuse connected in series; the power supply branch further includes a current detection module configured to output a current detection signal according to a current of the power supply branch; The short-circuit protection circuit further includes a control module connected to the power distribution switch, the current detection module, and the electronic fuse, respectively, configured to control a conduction state of the power distribution switch, determine a power supply current of the power supply branch according to the current detection signal, and control the electronic fuse to be disconnected when the power supply current exceeds a preset current threshold of the electronic fuse.

2. The short circuit protection circuit according to claim 1, characterized in that The overcurrent protection module includes at least two first fuses connected in parallel.

3. The short circuit protection circuit of claim 1, wherein The power output end is connected to one end of a power distribution cable, and the other end of the power distribution cable is connected to a load. The control module is further connected to the load and configured to configure the preset current threshold of the electronic fuse in the power supply branch to which the load is connected according to a power parameter of the load.

4. The short circuit protection circuit of claim 1, wherein The power supply branch includes a first power supply input end and a first power output end, and a second power supply input end and a second power output end, the first power supply input end is connected to a first power supply, and the second power supply input end is connected to a second power supply, the output voltages of the first power supply and the second power supply are different; the first power output end is connected to a first load, and the second power output end is connected to a second load.

5. The short circuit protection circuit of claim 1, wherein The power input end includes a positive input end and a negative input end, and the power output end includes a positive output end and a negative output end, the power distribution switch and the overcurrent protection module are connected in series between the positive input end and the positive output end, and the current detection module is connected to the negative input end and the negative output end, respectively.

6. The short circuit protection circuit of claim 5, wherein The current detection module includes an operational amplifier, a resistor, a capacitor, and a stabilizing tube, the non-inverting input end of the operational amplifier is connected to the negative input end, the inverting input end of the operational amplifier is connected to the negative output end, the output end of the operational amplifier is connected to a first end of the resistor, a second end of the resistor is connected to the control module, and the second end of the resistor is further connected to the control module through the parallel connection of the stabilizing tube and the capacitor.

7. The short circuit protection circuit of claim 1, wherein The power supply includes a main power supply and a backup power supply, the main power supply and the backup power supply are connected to the power input end, respectively; the selection switch is connected to the main power supply, the backup power supply, and the control module, respectively, and the control module is configured to select the main power supply or the backup power supply to supply power to the power input end through the selection switch; And / or, the load connected to the power supply branch includes a second fuse connected to the power distribution cable.

8. The short circuit protection circuit according to any one of claims 1 to 7, characterized in that The control module comprises a whole-satellite lower computer, and the load connected by the power distribution cable comprises single-machine equipment in the satellite.

9. A power supply controller, characterized by, The short-circuit protection circuit comprises the short-circuit protection circuit according to any one of claims 1-8.

10. A satellite, characterized by The power supply controller comprises the power supply controller according to claim 9.

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