Fuse on-off detection circuit and fuse on-off detection device

Abstract

The utility model provides a fuse on-off detection circuit and a fuse on-off detection device.The fuse on-off detection circuit comprises a common mode inductor, a fuse, a first detection circuit and a second detection circuit, and the first detection circuit comprises a first optocoupler, a second resistor, a third resistor, a fourth resistor and a ninth resistor; the first detection circuit comprises a first optocoupler, a first resistor, a second detection circuit comprises a second optocoupler, a sixth resistor, a seventh resistor, an eighth resistor and a tenth resistor, and the fuse on-off detection circuit can isolate alternating current through the first optocoupler and the second optocoupler and output corresponding signals according to the state of the alternating current, so that the reliability of isolating the alternating current is better, and the safety is high; besides, the fuse on-off detection circuit can detect whether the alternating current base is powered on or not and whether the fuse is abnormal or not through signal states output by the third end of the first optocoupler and the third end of the second optocoupler, and therefore the detection reliability of the fuse on-off detection circuit is good.

Description

Technical Field

[0001] The present disclosure relates to the field of portable energy storage / lithium battery technology, and in particular to a fuse on-off detection circuit and a fuse on-off detection device. Background Art

[0002] In the field of new energy, with the development of energy storage power supply technology, portable energy storage power supplies require higher and higher charging power. When designing AC on-off detection, there are safety issues due to the high AC voltage.

[0003] At present, there is a solution for AC insertion: use resistors to divide the voltage of the AC input L / N line (neutral / live line) and directly send it to the MCU for detection. This method does not isolate the low-voltage DC. Generally, the AC voltage is relatively large, and the high voltage needs to be converted to low voltage. The high voltage makes this solution have great safety risks.

[0004] Therefore, it is necessary to isolate high-voltage AC power to reduce the potential safety hazards caused by high voltage. At the same time, the status of the fuse can be detected to determine whether the voltage is abnormal. Utility Model Content

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a fuse on-off detection circuit and a fuse on-off detection device which can effectively isolate alternating current and detect the state of a fuse.

[0006] The purpose of this disclosure is achieved through the following technical solutions:

[0007] A fuse on-off detection circuit, comprising:

[0008] A common mode inductor, wherein the first end and the second end of the common mode inductor are used to be electrically connected to the AC socket;

[0009] A fuse, wherein the fourth end of the common mode inductor is electrically connected to the first end of the fuse, and the second end of the fuse is used for voltage output;

[0010] A first detection circuit includes a first optical coupler, a second resistor, a third resistor, a fourth resistor and a ninth resistor, wherein a first end of the second resistor is connected to a first end of the common-mode inductor, a second end of the second resistor is connected to a first end of the fourth resistor, a first end of the fourth resistor is also connected to a first end of the first optical coupler, a second end of the first optical coupler is respectively connected to a second end of the fourth resistor and a second end of the common-mode inductor, a third end of the first optical coupler is connected to a first end of the ninth resistor, a second end of the ninth resistor is grounded, and a fourth end of the first optical coupler is connected to a standard power supply through the third resistor;

[0011] The second detection circuit includes a second optocoupler, a sixth resistor, a seventh resistor, an eighth resistor and a tenth resistor, wherein the first end of the sixth resistor is connected to the first end of the fuse, the second end of the sixth resistor is connected to the first end of the eighth resistor, the first end of the eighth resistor is also connected to the first end of the second optocoupler, the second end of the second optocoupler is respectively connected to the second end of the eighth resistor and the second end of the common-mode inductor, the third end of the second optocoupler is connected to the first end of the tenth resistor, the second end of the tenth resistor is grounded, and the fourth end of the second optocoupler is connected to a standard power supply through the seventh resistor.

[0012] In one embodiment, the first detection circuit further includes a first resistor, a first end of the first resistor is connected to a first end of the common mode inductor, and a second end of the first resistor is connected to a first end of the second resistor.

[0013] In one embodiment, at least one of the first resistor and the second resistor is a variable resistor.

[0014] In one embodiment, the first detection circuit further includes a first universal diode, wherein an anode of the first universal diode is connected to a first end of the common-mode inductor, and a cathode of the first universal diode is connected to a first end of the first resistor.

[0015] In one embodiment, the first detection circuit further includes a first capacitor, an upper half of the first capacitor is connected to the first end of the ninth resistor, and a lower half of the first capacitor is connected to the second end of the ninth resistor.

[0016] In one embodiment, the second detection circuit further includes a fifth resistor, a first end of the fifth resistor is connected to the first end of the fuse, and a second end of the fifth resistor is connected to the first end of the sixth resistor.

[0017] In one embodiment, at least one of the fifth resistor and the sixth resistor is a variable resistor.

[0018] In one embodiment, the second detection circuit further includes a second general diode, an anode of the second general diode is connected to the first end of the fuse, and a cathode of the second general diode is connected to the first end of the fifth resistor.

[0019] In one embodiment, the second detection circuit further includes a second capacitor, an upper half of the second capacitor is connected to the first end of the tenth resistor, and a lower half of the second capacitor is connected to the second end of the tenth resistor.

[0020] A fuse on-off detection device comprises the fuse on-off detection circuit described in any one of the above embodiments.

[0021] Compared with the prior art, the present invention has at least the following advantages:

[0022] 1. The fuse on-off detection circuit can isolate the alternating current through the first optocoupler and the second optocoupler, and output a corresponding signal according to the state of the alternating current, thereby isolating the alternating current with good reliability and high safety.

[0023] 2. The fuse on-off detection circuit can also detect whether the AC socket is powered and whether the fuse is abnormal through the signal status output by the third end of the first optocoupler and the third end of the second optocoupler, so that the reliability of the fuse on-off detection circuit is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A circuit diagram of a fuse on / off detection circuit in an embodiment;

[0026] Figure 2 for Figure 1 A circuit diagram of a first detection circuit in a fuse on / off detection circuit shown;

[0027] Figure 3 for Figure 1 The circuit diagram of the second detection circuit in the fuse on-off detection circuit is shown.

[0028] Figure numerals: 10, fuse on-off detection circuit; 100, first detection circuit; 200, second detection circuit; L101, common mode inductor; B1, fuse; AC-Input, AC socket; U1, first optocoupler; U2, second optocoupler; R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; R5, fifth resistor; R6, sixth resistor; R7, seventh resistor; R8, eighth resistor; R9, ninth resistor; R10, tenth resistor; D1, first general diode; D2, second general diode; C1, first capacitor; C2, second capacitor. DETAILED DESCRIPTION

[0029] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present disclosure are given in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thoroughly and comprehensively understood.

[0030] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present disclosure. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0032] In order to better understand the technical solutions and beneficial effects of the present invention, the present invention is further described in detail below in conjunction with specific embodiments:

[0033] See also Figures 1 to 3 , which is a fuse on / off detection circuit 10 according to an embodiment of the present invention, including a common mode inductor L101 , a fuse B1 , a first detection circuit 100 and a second detection circuit 200 .

[0034] like Figure 1 As shown, the common-mode inductor L101 is used to be electrically connected to the AC socket AC-Input, wherein the first end of the common-mode inductor L101 is used to connect the phase line terminal (AC-L) of the AC socket AC-Input, the second end of the common-mode inductor L101 is used to connect the neutral line terminal (AC-N) of the AC socket AC-Input, the third end of the common-mode inductor L101 is used to connect the neutral line, the fourth end of the common-mode inductor L101 is electrically connected to the first end of the fuse B1, and the second end of the fuse B1 is used for voltage output.

[0035] The first detection circuit 100 includes a first optocoupler U1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a ninth resistor R9. The first end of the second resistor R2 is connected to the first end of the common-mode inductor L101, the second end of the second resistor R2 is connected to the first end of the fourth resistor R4, the first end of the fourth resistor R4 is also connected to the first end of the first optocoupler U1, the second end of the first optocoupler U1 is respectively connected to the second end of the fourth resistor R4 and the second end of the common-mode inductor L101, the third end of the first optocoupler U1 is connected to the first end of the ninth resistor R9, the second end of the ninth resistor R9 is grounded, and the fourth end of the first optocoupler U1 is connected to the standard power supply through the third resistor R3.

[0036] The second detection circuit 200 includes a second optocoupler U2, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8 and a tenth resistor R10. The first end of the sixth resistor R6 is connected to the first end of the fuse B1, the second end of the sixth resistor R6 is connected to the first end of the eighth resistor R8, the first end of the eighth resistor R8 is also connected to the first end of the second optocoupler U2, the second end of the second optocoupler U2 is respectively connected to the second end of the eighth resistor R8 and the second end of the common-mode inductor L101, the third end of the second optocoupler U2 is connected to the first end of the tenth resistor R10, the second end of the tenth resistor R10 is grounded, and the fourth end of the second optocoupler U2 is connected to the standard power supply through the seventh resistor R7.

[0037] In this embodiment, the fuse on-off detection circuit 10 can isolate the alternating current through the first optocoupler U1 and the second optocoupler U2, and output a corresponding signal according to the state of the alternating current, thereby isolating the alternating current with good reliability and high safety; in addition, the fuse on-off detection circuit 10 can also detect whether the AC socket AC-Input is connected to power and whether the fuse B1 is abnormal through the signal states output by the third end of the first optocoupler U1 and the third end of the second optocoupler U2, thereby achieving good reliability in detection.

[0038] It can be understood that when there is no voltage in the AC input, the first optocoupler U1 is not turned on, the signal Fuse-Front at the third end of the first optocoupler U1 is at a low level, the second optocoupler U2 is not turned on, and the value of the signal Fuse-Back at the third end of the second optocoupler U2 is 0 (i.e., a low level). The control unit (MCU) detects that Fuse-Front and Fuse-Back are at a low level, and determines that the AC power is not inserted based on the level status of the two. When AC power is inserted into the AC socket AC-Input and powered on, current flows through the phase and neutral terminals of the AC socket AC-Input, and the current limiting function of the second resistor R2 turns on the first optical coupler U1. At this time, the third terminal of the first optical coupler U1 outputs a high-level Fuse-Front signal. The control unit detects that the signal value of Fuse-Front is 1 (i.e., a high level). If current flows through the fourth terminal of the common-mode inductor L101, i.e., the fuse B1, current also flows through the second detection circuit 200, and the current limiting function of the sixth resistor R6 turns on the second optical coupler U2. At this time, the third terminal of the second optical coupler U2 The control unit detects that the signal value of Fuse-Back is 1, and it can be determined that AC power has been inserted and fuse B1 is in normal use. If there is no current at the fourth end of the common-mode inductor L101, that is, fuse B1, there is no current in the second detection circuit 200, and the second optical coupler U2 is not conducting. At this time, the Fuse-Back signal at the third end of the second optical coupler U2 is low level, and the control unit detects that the signal value of Fuse-Back is 0 and does not change. At this time, it can be determined that AC power has been inserted, but fuse B1 is abnormal. In this way, the fuse on-off detection circuit 10 only needs the control unit to determine the status of the Fuse-Front signal and the Fuse-Back signal to determine whether the AC socket AC-Input is powered on and whether fuse B1 is normal.

[0039] Further, the first end of the first optocoupler U1 and the second end of the first optocoupler U1 constitute an input diode, wherein the first end of the first optocoupler U1 is the input positive electrode, the second end of the first optocoupler U1 is the input negative electrode, the third end of the first optocoupler U1 and the fourth end of the first optocoupler U1 constitute a light-receiving triode, wherein the third end of the first optocoupler U1 is an emitter for outputting a Fuse-Front signal, and the fourth end of the first optocoupler U1 is a collector; the first end of the second optocoupler U2 and the second end of the second optocoupler U2 constitute an input diode, wherein the first end of the second optocoupler U2 is the input positive electrode, the second end of the second optocoupler U2 is the input negative electrode, the third end of the second optocoupler U2 and the fourth end of the second optocoupler U2 constitute a light-receiving triode, wherein the third end of the second optocoupler U2 is an emitter for outputting a Fuse-Back signal, and the fourth end of the second optocoupler U2 is a collector.

[0040] like Figure 2As shown, in one embodiment, the first detection circuit 100 further includes a first resistor R1, a first end of the first resistor R1 is connected to a first end of the common mode inductor L101, and a second end of the first resistor R1 is connected to a first end of a second resistor R2. It can be understood that the first resistor R1 and the second resistor R2 are connected in series to jointly limit the current of the alternating current, protecting the first optical coupler U1 from excessive current breaking through the first end and the second end of the first optical coupler U1.

[0041] like Figure 2 As shown, in one embodiment, at least one of the first resistor R1 and the second resistor R2 is a variable resistor. It can be understood that when at least one of the first resistor R1 and the second resistor R2 is a variable resistor, the resistance ratio of the first resistor R1 and the second resistor R2 can be adjusted by adjusting one or both of the first resistor R1 and the second resistor R2 to ensure the normal current limiting condition of the current.

[0042] like Figure 2 As shown, in one embodiment, the first detection circuit 100 also includes a first universal diode D1, the anode of the first universal diode D1 is connected to the first end of the common-mode inductor L101, and the cathode of the first universal diode D1 is connected to the first end of the first resistor R1, that is, the first universal diode D1 is connected in series to the first resistor R1, so that the current at the live wire end of the AC socket AC-Input flows unidirectionally to the neutral wire end of the AC socket AC-Input, and the first universal diode D1 rectifies the AC power to avoid current backflow.

[0043] like Figure 2 As shown, in one embodiment, the first detection circuit 100 further includes a first capacitor C1, the upper half of the first capacitor C1 is connected to the first end of the ninth resistor R9, and the lower half of the first capacitor C1 is connected to the second end of the ninth resistor R9. It can be understood that the first capacitor C1 and the ninth resistor R9 are connected in parallel to form a capacitor-resistance loop, wherein the first capacitor C1 is used to stabilize the voltage at the third end of the first optical coupler U1 to avoid large voltage fluctuations, and the combination of the first capacitor C1 and the ninth resistor R9 can filter the Fuse-Front signal to reduce interference from redundant signals.

[0044] like Figure 3 As shown, in one embodiment, the second detection circuit 200 further includes a fifth resistor R5, a first end of the fifth resistor R5 is connected to the first end of the fuse B1, and a second end of the fifth resistor R5 is connected to the first end of the sixth resistor R6. It can be understood that the fifth resistor R5 and the sixth resistor R6 are connected in series, and together limit the current of the alternating current, protecting the second optical coupler U2 from excessive current breaking through the first end and the second end of the second optical coupler U2.

[0045] like Figure 3As shown, in one embodiment, at least one of the fifth resistor R5 and the sixth resistor R6 is a variable resistor. It can be understood that when at least one of the fifth resistor R5 and the sixth resistor R6 is a variable resistor, the resistance ratio of the fifth resistor R5 and the sixth resistor R6 can be adjusted by adjusting one or both of the fifth resistor R5 and the sixth resistor R6 to ensure the normal current limiting condition of the current.

[0046] like Figure 3 As shown, in one embodiment, the second detection circuit 200 also includes a second universal diode D2, the anode of the second universal diode D2 is connected to the first end of the fuse B1, and the cathode of the second universal diode D2 is connected to the first end of the fifth resistor R5, that is, the second universal diode D2 is connected in series with the fifth resistor R5, so that the current of the fourth end of the common-mode inductor L101, that is, the fuse B1, flows unidirectionally to the neutral line end of the AC socket AC-Input, and the second universal diode D2 rectifies the AC alternating current to avoid current backflow.

[0047] like Figure 3 As shown, in one embodiment, the second detection circuit 200 further includes a second capacitor C2, the upper half of the second capacitor C2 is connected to the first end of the tenth resistor R10, and the lower half of the second capacitor C2 is connected to the second end of the tenth resistor R10. It can be understood that the second capacitor C2 and the tenth resistor R10 are connected in parallel to form a capacitor-resistance loop, wherein the second capacitor C2 is used to stabilize the voltage at the third end of the second optical coupler U2 to avoid large voltage fluctuations, and the combination of the second capacitor C2 and the tenth resistor R10 can filter the Fuse-Back signal to reduce interference from redundant signals.

[0048] The present disclosure also provides a fuse on-off detection device, including the fuse on-off detection circuit 10 of any one of the above embodiments. When the fuse on-off detection device adopts the fuse on-off detection circuit 10, it can be determined whether the AC socket AC-Input is connected to power and whether the common-mode inductor L101 is normal through the status of the Fuse-Front signal and the Fuse-Back signal. Specifically, when the Fuse-Front signal value and the Fuse-Back signal value are both 0, the AC socket AC-Input is not connected to power; when the Fuse-Front signal value and the Fuse-Back signal value are both 1, the AC socket AC-Input is connected to power and the common-mode inductor L101 works normally; when the Fuse-Front signal value is 1 and the Fuse-Back signal value is 0, the AC socket AC-Input is connected to power but the common-mode inductor L101 is abnormal.

[0049] Compared with the prior art, the present invention has at least the following advantages:

[0050] 1. The fuse on-off detection circuit 10 can isolate the alternating current through the first optocoupler U1 and the second optocoupler U2, and output a corresponding signal according to the state of the alternating current, thereby isolating the alternating current with good reliability and high safety.

[0051] 2. The fuse on-off detection circuit 10 can also detect whether the AC socket AC-Input is powered and whether the fuse B1 is abnormal through the signal status output by the third end of the first optocoupler U1 and the third end of the second optocoupler U2, so that the detection reliability of the fuse on-off detection circuit 10 is better.

[0052] The above-mentioned embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the disclosed patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the disclosed patent shall be subject to the attached claims.

Claims

1. A fuse on-off detection circuit, characterized in that: include: A common mode inductor, wherein the first end and the second end of the common mode inductor are used to be electrically connected to the AC socket; A fuse, wherein the fourth end of the common mode inductor is electrically connected to the first end of the fuse, and the second end of the fuse is used for voltage output; A first detection circuit includes a first optical coupler, a second resistor, a third resistor, a fourth resistor and a ninth resistor, wherein a first end of the second resistor is connected to a first end of the common-mode inductor, a second end of the second resistor is connected to a first end of the fourth resistor, a first end of the fourth resistor is also connected to a first end of the first optical coupler, a second end of the first optical coupler is respectively connected to a second end of the fourth resistor and a second end of the common-mode inductor, a third end of the first optical coupler is connected to a first end of the ninth resistor, a second end of the ninth resistor is grounded, and a fourth end of the first optical coupler is connected to a standard power supply through the third resistor; The second detection circuit includes a second optocoupler, a sixth resistor, a seventh resistor, an eighth resistor and a tenth resistor, wherein the first end of the sixth resistor is connected to the first end of the fuse, the second end of the sixth resistor is connected to the first end of the eighth resistor, the first end of the eighth resistor is also connected to the first end of the second optocoupler, the second end of the second optocoupler is respectively connected to the second end of the eighth resistor and the second end of the common-mode inductor, the third end of the second optocoupler is connected to the first end of the tenth resistor, the second end of the tenth resistor is grounded, and the fourth end of the second optocoupler is connected to a standard power supply through the seventh resistor.

2. The fuse on / off detection circuit according to claim 1, characterized in that: The first detection circuit further includes a first resistor, a first end of the first resistor is connected to the first end of the common mode inductor, and a second end of the first resistor is connected to the first end of the second resistor.

3. The fuse on / off detection circuit according to claim 2, characterized in that: At least one of the first resistor and the second resistor is a variable resistor.

4. The fuse on / off detection circuit according to claim 2, characterized in that: The first detection circuit further includes a first general diode, wherein an anode of the first general diode is connected to a first end of the common mode inductor, and a cathode of the first general diode is connected to a first end of the first resistor.

5. The fuse on / off detection circuit according to claim 1, characterized in that: The first detection circuit further includes a first capacitor, an upper half of the first capacitor is connected to the first end of the ninth resistor, and a lower half of the first capacitor is connected to the second end of the ninth resistor.

6. The fuse on / off detection circuit according to claim 1, characterized in that: The second detection circuit further includes a fifth resistor, a first end of the fifth resistor is connected to the first end of the fuse, and a second end of the fifth resistor is connected to the first end of the sixth resistor.

7. The fuse on / off detection circuit according to claim 6, characterized in that: At least one of the fifth resistor and the sixth resistor is a variable resistor.

8. The fuse on / off detection circuit according to claim 6, characterized in that: The second detection circuit further includes a second general-purpose diode, an anode of the second general-purpose diode is connected to the first end of the fuse, and a cathode of the second general-purpose diode is connected to the first end of the fifth resistor.

9. The fuse on / off detection circuit according to claim 1, characterized in that: The second detection circuit further includes a second capacitor, an upper half of the second capacitor is connected to the first end of the tenth resistor, and a lower half of the second capacitor is connected to the second end of the tenth resistor.

10. A fuse on / off detection device, characterized in that: The invention comprises a fuse on-off detection circuit as described in any one of claims 1 to 9.

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