CN211577382U - Short circuit detection device and charging equipment - Google Patents
Short circuit detection device and charging equipment Download PDFInfo
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- CN211577382U CN211577382U CN201922095984.7U CN201922095984U CN211577382U CN 211577382 U CN211577382 U CN 211577382U CN 201922095984 U CN201922095984 U CN 201922095984U CN 211577382 U CN211577382 U CN 211577382U
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Abstract
The utility model provides a short circuit detection device for whether first sense terminal and the second sense terminal of detecting electronic equipment short circuit, short circuit detection device includes: the Pulse Width Modulation (PWM) signal generating circuit is used for receiving an operation signal of the electronic equipment, generating a PWM detection signal according to the condition that the operation signal is not received, and sending the PWM detection signal to the first detection end; and the detection circuit is used for receiving the signal of the second detection end and detecting the signal, and has simple structure and convenient detection. The utility model discloses still provide the battery charging outfit who has this short circuit detection device.
Description
Technical Field
The utility model relates to an electron detection area particularly, mainly relates to a short circuit detection device to and battery charging outfit who has this short circuit detection device.
Background
With the improvement of the technological level and the development of new energy electric vehicles, correspondingly, charging equipment is more and more available for people to live, the charging equipment usually uses a standard 220V power supply or 380V voltage, and in use, the short circuit phenomenon between power lines is an important factor causing the problem of power utilization safety, so that the short circuit detection of the power lines of the charging equipment becomes an important subject. Conventional short circuit detection schemes are complicated, and none of them is a short circuit detection scheme for a charging device, which is to be improved.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's defect, provide a simple structure and to the safe short circuit detection device of battery charging outfit. The utility model also provides a battery charging outfit that has this short circuit detection device.
In order to achieve the above object, the utility model adopts the following technical scheme:
a short circuit detection device for detecting whether a first detection terminal and a second detection terminal of an electronic device are short-circuited, the short circuit detection device comprising:
the Pulse Width Modulation (PWM) signal generating circuit is used for receiving an operation signal of the electronic equipment, generating a PWM detection signal according to the condition that the operation signal is not received, and sending the PWM detection signal to the first detection end; and the number of the first and second groups,
and the detection circuit is used for receiving and detecting the signal of the second detection end.
A charging device comprises the short circuit detection device and an auxiliary isolation power source, wherein the isolation power source comprises a power conversion chip U4, a first voltage terminal Vin1, a second voltage terminal Vin2, a first ground terminal PE, a second ground terminal GND, at least one sixth capacitor C6 and at least one seventh capacitor C7, the first voltage terminal Vin1 is connected to the voltage input pin Vin of the power conversion chip U4, the first ground terminal PE is connected to the ground input pin Gin of the power conversion chip U4, the first voltage terminal Vin1 is connected to the first ground terminal PE through each of the sixth capacitors C6, the second voltage terminal Vin2 is connected to the voltage output pin Vout of the power conversion chip U4, the second ground terminal GND is connected to the ground output pin Gout of the power conversion chip U4, the second voltage terminal Vin2 is connected to the second ground GND through each of the seventh capacitors C7.
A charging device comprises the short circuit detection device, a device starting device and a power supply, wherein the device starting device is used for conducting the power supply according to an operation signal.
The utility model has the advantages that:
the utility model provides a short circuit detection device and battery charging outfit utilizes battery charging outfit's PWM signal as the detected signal, generates specific PWM signal after, makes PWM through the sense terminal, detects the signal behind the sense terminal again, if detect specific detected signal, then show the actual short circuit of battery charging outfit, simple structure, it is convenient to detect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, and it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope of the present invention.
Fig. 1 is a schematic structural frame diagram of a short circuit detection device according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of the short circuit detection device in FIG. 1;
fig. 3 is a schematic diagram of a circuit structure of an isolated power supply in a charging device according to another embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a starting device in a charging apparatus according to another embodiment of the present invention.
Detailed Description
Hereinafter, various embodiments of the present invention will be described more fully. The present invention is capable of various embodiments and of being modified and varied therein. However, it should be understood that: there is no intention to limit the various embodiments of the invention to the specific embodiments disclosed herein, but on the contrary, the intention is to cover all modifications, equivalents, and/or alternatives falling within the spirit and scope of the various embodiments of the invention.
Hereinafter, the terms "includes" or "may include" used in various embodiments of the present invention indicate the presence of the disclosed functions, operations, or elements, and do not limit the addition of one or more functions, operations, or elements. Furthermore, as used in various embodiments of the present invention, the terms "comprises," "comprising," "includes," "including," "has," "having" and their derivatives are intended to refer only to the particular feature, number, step, operation, element, component, or combination of the foregoing, and should not be construed as first excluding the existence of, or adding to, one or more other features, numbers, steps, operations, elements, components, or combination of the foregoing.
In various embodiments of the present invention, the expression "a or/and B" includes any or all combinations of the words listed simultaneously, e.g. may include a, may include B or may include both a and B.
Expressions (such as "first", "second", and the like) used in various embodiments of the present invention may modify various constituent elements in various embodiments, but may not limit the respective constituent elements. For example, the above description does not limit the order and/or importance of the elements described. The foregoing description is for the purpose of distinguishing one element from another. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of various embodiments of the present invention.
It should be noted that: in the present invention, unless otherwise explicitly specified or defined, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; there may be communication between the interiors of the two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present invention, it should be understood by those skilled in the art that the terms indicating orientation or positional relationship herein are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
The terminology used in the various embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the various embodiments of the invention. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of the present invention pertain. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments of the present invention.
Referring to fig. 1, an embodiment of the present invention provides a short circuit detection device 100, applied to a charging device 200, specifically for detecting whether a first detection end 201 and a second detection end 202 of an electronic device 200 are short-circuited, the short circuit detection device includes:
a Pulse Width Modulation (PWM) signal generating circuit 10, configured to receive an operation signal of an electronic device, generate a PWM detection signal according to that the operation signal is not received, and send the PWM detection signal to the first detection terminal 201; and the number of the first and second groups,
the detection circuit 20 is configured to receive the signal from the second detection terminal 202 and perform detection.
In this embodiment, the PWM signal generation circuit 10 is actually a PWM generator in the charging device 200, and can specifically generate a PWM signal with a constant voltage and frequency. The detection circuit 20 detects the received signal, and it can be understood that if the first detection terminal 201 and the second detection terminal 202 are short-circuited, after the connection is controlled according to the above, the PWM signal generation circuit 10 is actually connected to the detection circuit 20, at this time, the PWM signal can be transmitted to the detection circuit 20, if the PWM signal is detected, it indicates that the detected first detection terminal 201 and the second detection terminal 202 are actually short-circuited, otherwise, there is no short-circuit.
Referring to fig. 2, the PWM signal generating circuit 10 further includes a pulse input terminal PWMin, a first switch Q1, a first optocoupler U1, a first resistor R1, a second resistor R2, and a first operation signal input unit Rinx, the pulse input terminal PWMin is connected to the control terminal of the first switch Q1, the second terminal of the first switch Q1 is grounded through the first resistor R1, the first operation signal input unit Rinx is used for receiving an operation signal, the first operation signal input unit Rinx is grounded through the first resistor R1, the second end of the first switch Q1 is connected with the second end of the first optical coupler U1, the first end of the first optical coupler U1 is connected with a first voltage end Vin1, the third end of the first optocoupler U1 is connected with the first detection end, the third end of the first optocoupler U1 is grounded through the second resistor R2, and the fourth end of the first optocoupler U1 is connected with a second voltage end Vin 2.
In this embodiment, the pulse input terminal PWMin is configured to input a pulse signal with a specific frequency, specifically, the pulse signal is a pulse signal with a high level and a low level alternating with each other, and the first switch Q1 is actually a transistor, specifically, an NPN transistor. When the pulse input terminal PWMin inputs a high level, the control terminal of the first switch Q1 receives the high level, so that the first terminal of the first switch Q1 is connected with the second terminal, at this time, the second terminal of the first optocoupler U1 is grounded, the first terminal of the first optocoupler U1 is connected with the high level, the first terminal and the second terminal of the first optocoupler U1 meet the trigger condition, so that the third terminal and the fourth terminal of the first optocoupler U1 are connected, so that the first detection terminal 201 is connected with the second voltage input terminal Vin2, and the first detection terminal is actually at the high level; on the contrary, when the pulse input terminal PWMin inputs a low level, the control terminal of the first switch Q1 receives a low level, so that the first terminal and the second terminal of the first switch Q1 are not connected, at this time, the second terminal of the first optocoupler U1 is not grounded, the first terminal and the second terminal of the first optocoupler U1 do not satisfy the trigger condition, so that the third terminal and the fourth terminal of the first optocoupler U1 are not connected, so that the first detection terminal 201 is grounded through the second resistor R2, and is actually a low level. Through the above circuit, a PWM signal of a specific frequency is formed at the first detection terminal 201. When the first operation signal input unit Rinx inputs a high level signal, no matter whether the first switch Q1 is turned on, the first end and the second end of the first optocoupler U1 do not satisfy the conduction condition, so that the PWM signal generating circuit 10 cannot generate a PWM signal, and at this time, no matter the pulse input terminal PWMin inputs a high level or a low level, the short circuit detection device 100 cannot actually detect, and thus, the operation of the charging device 200 is prevented from being collided.
Preferably, the PWM signal generating circuit further includes a third resistor R3, a fourth resistor R4, and a first capacitor C1, the pulse input terminal PWMin is connected to the control terminal of the first switch Q1 through the third resistor R3, the pulse input terminal PWMin is grounded through the third resistor R3 and the fourth resistor R4, and the pulse input terminal PWMin is grounded through the first capacitor C1. In this embodiment, the third resistor R3, the fourth resistor R4 and the first capacitor C1 are used for limiting the current of a line from the pulse input terminal PWMin to the control terminal of the first switch Q1 and stabilizing the frequency of the pulse signal, so that the generated PWM signal is stabilized.
Preferably, the PWM signal generating circuit further includes a second capacitor C2 and a first diode D1, a third terminal of the first optocoupler U1 is connected to a fourth terminal of the first optocoupler U1 through the second capacitor C2, a third terminal of the first optocoupler U1 is connected to a first terminal of the first diode D1, and a fourth terminal of the first optocoupler U1 is connected to a second terminal of the first diode D1. The first diode D1 and the second capacitor C2 are used to prevent the reverse flow of the energized level signal of the first detection terminal 201 from damaging the first optocoupler U1.
Preferably, the first operation signal input unit Rinx includes a first input terminal Rin1, a second input terminal Rin2, and at least two second diodes D2, and the first input terminal Rin1 and the second input terminal Rin2 are respectively connected to the first terminal of the first switch Q1 through one second diode D2. In this embodiment, the first input terminal Rin1 and the second input terminal Rin2 actually correspond to the zero line signal and the live line signal of the charging apparatus 200. It will be appreciated that in other embodiments the number of inputs may be set to other numbers, for example 3, 4.
Preferably, the PWM signal generating circuit further includes a fifth resistor R5 and a third capacitor C3, and the third terminal of the first optocoupler U1 is connected to the first detecting terminal through the fifth resistor R5 and the third capacitor C3. In this embodiment, the fifth resistor R5 and the third capacitor C3 are used to block the dc signal on the path and divide the voltage.
Further, the detection circuit 20 includes an amplifier U2, a second optical coupler U3, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a fourth capacitor C4 and a detection output terminal Tout, a non-inverting input pin INP of the amplifier U1 is connected to the second detection terminal, the non-inverting input pin INP is grounded through the sixth resistor R6, an inverting input pin INN of the amplifier U1 is connected to an output pin OUT of the amplifier U1, the output pin OUT is connected to the first terminal of the second optical coupler U3 through the seventh resistor R7, a positive voltage pin V + of the amplifier U1 is connected to a positive voltage of the second voltage terminal Vin2, a positive voltage pin V + of the amplifier U1 is also grounded through the fourth capacitor C4, a negative voltage pin V-of the amplifier U1 is grounded, the second terminal of the second optical coupler U3 is grounded, the third terminal of the second optical coupler U3 is grounded, the fourth end of the second optical coupler U3 is connected to the detection output terminal Tout, and the fourth end of the second optical coupler U3 is further connected to a first voltage terminal Vin1 through the eighth resistor R8.
In this embodiment, if the first detection terminal 201 is connected to the second detection terminal 202 in a short circuit, the PWM signal generated by the PWM generation circuit 10 is transmitted to the second detection terminal 202 through the first detection terminal 201, and then transmitted to the amplifier U2 for signal amplification, and then further processed by isolation and conversion through the second optical coupler U3, and thereafter, the signal output by the second optical coupler U3 is stable, and it can be determined whether the first detection terminal 201 is short-circuited with the second detection terminal 202 by detecting whether the output signal matches with the generated PWM signal.
Preferably, the detection circuit further includes a ninth resistor R9 and a fifth capacitor C5, and the non-inverting input pin INN of the amplifier U2 is connected to the second detection terminal through the ninth resistor R9 and the fifth capacitor C5. The ninth resistor R9 and the fifth capacitor C5 are used to prevent the dc signal of the second detection terminal 202 from being transmitted to the amplifier U2 and divided.
Referring to fig. 3, the embodiment of the present invention further provides a charging apparatus 200, which includes the short circuit detection device 100 and the auxiliary isolation power source 203, the isolation power 203 comprises a power conversion chip U4, a first voltage terminal Vin1, a second voltage terminal Vin2, a first ground PE, a second ground GND, at least one sixth capacitor C6 and at least one seventh capacitor C7, the first voltage terminal Vin1 is connected to the voltage input pin Vin of the power conversion chip U4, the first ground terminal PE is connected to the ground input pin Gin of the power conversion chip U4, the first voltage terminal Vin1 is connected to the first ground terminal PE through each of the sixth capacitors C6, the second voltage terminal Vin2 is connected to the voltage output pin Vout of the power conversion chip U4, the second ground terminal GND is connected to the ground output pin Gout of the power conversion chip U4, the second voltage terminal Vin2 is connected to the second ground terminal GND through each of the seventh capacitors C7;
a second end of the first switch Q1 is connected to a first ground terminal PE through the first resistor R1, the first running signal input unit Rinx is connected to the first ground terminal PE through the first resistor R1, and a third end of the first optocoupler U1 is connected to a second ground terminal GND through the second resistor R2; alternatively, the first and second electrodes may be,
the pulse input terminal PWMin is connected to a first ground terminal PE through the third resistor R3 and the fourth resistor R4, and the pulse input terminal PWMin is connected to the first ground terminal PE through the first capacitor C1.
Further, another embodiment provides a charging apparatus 200, comprising the short circuit detection device 100 and the auxiliary isolation power source 203, the isolation power 203 comprises a power conversion chip U4, a first voltage terminal Vin1, a second voltage terminal Vin2, a first ground PE, a second ground GND, at least one sixth capacitor C6 and at least one seventh capacitor C7, the first voltage terminal Vin1 is connected to the voltage input pin Vin of the power conversion chip U4, the first ground terminal PE is connected to the ground input pin Gin of the power conversion chip U4, the first voltage terminal Vin1 is connected to the first ground terminal PE through each of the sixth capacitors C6, the second voltage terminal Vin2 is connected to the voltage output pin Vout of the power conversion chip U4, the second ground terminal GND is connected to the ground output pin Gout of the power conversion chip U4, the second voltage terminal Vin2 is connected to the second ground terminal GND through each of the seventh capacitors C7;
the positive phase input pin INP is connected to a second ground terminal GND through the sixth resistor R6, the positive voltage pin V + of the amplifier U1 is further connected to the second ground terminal GND through the fourth capacitor C4, the negative voltage pin V-of the amplifier U1 is connected to the second ground terminal GND, the second end of the second optocoupler U3 is connected to the second ground terminal GND, and the third end of the second optocoupler U3 is connected to the first ground terminal PE.
The isolation power supply 203 is actually used to isolate different areas of the short circuit detection apparatus 100 from each other, thereby avoiding interference between them.
Referring to fig. 4, an embodiment of the present invention further provides a charging device 200, including the short circuit detection device 100, the device starting device 204, and the power source 205, where the device starting device 204 is configured to turn on the power source 205 according to an operation signal.
In this embodiment, the device activation apparatus 204 turns on the power supply 205 according to the operation signal, and accordingly, the circuit detection apparatus 100 turns off the short circuit detection according to the operation signal.
Further, the device start-up apparatus 204 includes a second operation signal input unit Riny and a switch circuit 206, the second operation signal input unit Riny is used for inputting an operation signal, the switch circuit 206 is respectively connected to the input terminal and the output terminal of the power source 205 and the second device operation input unit Riny, and the switch circuit 206 is used for turning on the input terminal and the output terminal of the power source according to the operation signal.
Further, the second running signal input unit Riny includes a third input terminal Rin3 and a fourth input terminal Rin4, the number of the switch circuits 206 is two, the power source 205 includes two sets of corresponding input terminals and output terminals, wherein one switch circuit 206 is correspondingly connected to the third input terminal Rin3 and one of the set of input terminals and output terminals of the power source; the other switch circuit 206 is correspondingly connected to the fourth input terminal Rin4 and another set of input terminals and output terminals of the power supply. In this embodiment, the number of the switch circuits 206, the number of the output ends and the input ends of the power source 205, and the number of the power lines of the charging device 200 are matched, for example, specifically, the charging device 200 is an ac charging pile, and the power lines include a zero line and a live line, so correspondingly, the number of the switch circuits 206 and the number of the output ends and the input ends of the power source 205 are also two respectively.
Further, the switch circuit 206 includes a second switch Q2, a third switch Q3, a relay 207 and a third voltage input terminal Vin3, the second running signal input unit Riny is connected to the control terminal of the second switch Q2, the first terminal of the second switch Q2 is grounded, the second terminal of the second switch Q2 is connected to the control terminal of the third switch Q3, the first terminal of the third switch Q3 is connected to the third voltage input terminal Vin3, two terminals of the coil resistor of the second relay 207 are respectively connected to the second terminal of the third switch Q3 and the ground, and the input terminal and the output terminal of the power supply are correspondingly connected to two pins of the relay 207.
Preferably, the switch circuit 206 further includes a tenth resistor R10, and the second operation signal input unit Riny is connected to the control terminal of the second switch Q2 through the tenth resistor R10. In this embodiment, the ninth resistor R10 is used for limiting the current of the line between the second running signal input unit Riny and the control terminal of the second switch Q2.
Preferably, the switch circuit 206 further includes an eleventh resistor R11 and a twelfth resistor R12, the first terminal of the second switch Q2 is grounded through the eleventh resistor R11, and the control terminal of the third switch Q3 is connected to the first terminal of the third switch Q3 through the eleventh resistor R11.
In this embodiment, the eleventh resistor R11 and the twelfth resistor R12 are used for voltage division, so that a voltage difference between the control end and the first end of the third switch Q3 is not too large to cause a breakdown of the switch.
Preferably, the switch circuit 206 further includes a thirteenth resistor R13 and an eighth capacitor C8, the third voltage input terminal Vin3 is connected to the first end of the third switch Q3 through the thirteenth resistor R13, and the third voltage input terminal Vin3 is further connected to the ground through the thirteenth resistor R13 and the eighth capacitor C8. In this embodiment, the thirteenth resistor R13 and the eighth capacitor C8 are used for filtering the level signal of the third voltage input terminal Vin3 to filter unstable interference signals.
The switch circuit further includes at least one ninth capacitor C9, and the second terminal of the third switch Q3 is grounded through each of the ninth capacitors C9. In this embodiment, the ninth capacitor C9 is used for filtering the level signal passing through the third switch Q3.
The utility model provides a short circuit detection device and battery charging outfit utilizes battery charging outfit's PWM signal as the detected signal, generates specific PWM signal after, makes PWM through the sense terminal, detects the signal behind the sense terminal again, if detect specific detected signal, then show the actual short circuit of battery charging outfit, simple structure, it is convenient to detect.
The above-described embodiments are merely illustrative of several embodiments of the present invention, which are described in detail and specific, but not intended to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, other various changes and modifications can be made according to the above-described technical solutions and concepts, and all such changes and modifications should fall within the protection scope of the present invention.
Claims (15)
1. A short circuit detection device for detecting whether a first detection terminal and a second detection terminal of an electronic device are short-circuited, the short circuit detection device comprising:
the Pulse Width Modulation (PWM) signal generating circuit is used for receiving an operation signal of the electronic equipment, generating a PWM detection signal according to the condition that the operation signal is not received, and sending the PWM detection signal to the first detection end; and the number of the first and second groups,
and the detection circuit is used for receiving and detecting the signal of the second detection end.
2. The short circuit detection device according to claim 1, wherein the PWM signal generating circuit comprises a pulse input terminal PWMin, a first switch Q1, a first optical coupler U1, a first resistor R1, a second resistor R2 and a first operation signal input unit Rinx, the pulse input terminal PWMin is connected to a control terminal of the first switch Q1, a second terminal of the first switch Q1 is grounded via the first resistor R1, the first operation signal input unit Rinx is used for receiving an operation signal, the first operation signal input unit Rinx is grounded via the first resistor R1, a second terminal of the first switch Q1 is connected to a second terminal of the first optical coupler U1, a first terminal of the first optical coupler U1 is connected to a first voltage terminal Vin1, a third terminal of the first optical coupler U1 is connected to the first detection terminal, a third terminal of the first optical coupler U1 is grounded via the second resistor R2, the fourth end of the first optical coupler U1 is connected with a second voltage end Vin 2.
3. The short circuit detection device according to claim 2, wherein the PWM signal generation circuit further includes a third resistor R3, a fourth resistor R4, and a first capacitor C1, the pulse input terminal PWMin is connected to the control terminal of the first switch Q1 through the third resistor R3, the pulse input terminal PWMin is grounded through the third resistor R3 and the fourth resistor R4, and the pulse input terminal PWMin is grounded through the first capacitor C1.
4. The short circuit detection device as claimed in claim 2, wherein the PWM signal generation circuit further comprises a second capacitor C2 and a first diode D1, a third terminal of the first optocoupler U1 is connected to a fourth terminal of the first optocoupler U1 through the second capacitor C2, a third terminal of the first optocoupler U1 is connected to a first terminal of the first diode D1, and a fourth terminal of the first optocoupler U1 is connected to a second terminal of the first diode D1.
5. The short circuit detection device as claimed in claim 2, wherein the first operation signal input unit Rinx includes a first input terminal Rin1, a second input terminal Rin2, and at least two second diodes D2, and the first input terminal Rin1 and the second input terminal Rin2 are respectively connected to the first terminal of the first switch Q1 through one second diode D2.
6. The short circuit detection device of claim 2, wherein the PWM signal generation circuit further comprises a fifth resistor R5 and a third capacitor C3, and the third terminal of the first optocoupler U1 is connected to the first detection terminal through the fifth resistor R5 and the third capacitor C3.
7. The short circuit detection device as claimed in claim 1, wherein the detection circuit comprises an amplifier U2, a second optical coupler U3, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a fourth capacitor C4 and a detection output terminal Tout, a non-inverting input pin INP of the amplifier U1 is connected to the second detection terminal, the non-inverting input pin INP is grounded via the sixth resistor R6, an inverting input pin INN of the amplifier U1 is connected to an output pin OUT of the amplifier U1, the output pin OUT is connected to a first terminal of the second optical coupler U3 via the seventh resistor R7, a positive voltage pin V + of the amplifier U1 is connected to a second voltage terminal 2, a positive voltage pin V + of the amplifier U1 is further grounded via the fourth capacitor C4, a negative voltage pin V-of the amplifier U1 is grounded, a second terminal of the second optical coupler U3 is grounded, the third end of the second optical coupler U3 is grounded, the fourth end of the second optical coupler U3 is connected to the detection output terminal Tout, and the fourth end of the second optical coupler U3 is further connected to a first voltage terminal Vin1 through the eighth resistor R8.
8. The short circuit detection device as claimed in claim 7, wherein the detection circuit further comprises a ninth resistor R9 and a fifth capacitor C5, and the non-inverting input pin INN of the amplifier U2 is connected to the second detection terminal through the ninth resistor R9 and the fifth capacitor C5.
9. A charging apparatus comprising the short circuit detection device according to claim 3 and an auxiliary isolated power supply, the isolated power supply comprises a power conversion chip U4, a first voltage terminal Vin1, a second voltage terminal Vin2, a first ground PE, a second ground GND, at least one sixth capacitor C6 and at least one seventh capacitor C7, the first voltage terminal Vin1 is connected to the voltage input pin Vin of the power conversion chip U4, the first ground terminal PE is connected to the ground input pin Gin of the power conversion chip U4, the first voltage terminal Vin1 is connected to the first ground terminal PE through each of the sixth capacitors C6, the second voltage terminal Vin2 is connected to the voltage output pin Vout of the power conversion chip U4, the second ground terminal GND is connected to the ground output pin Gout of the power conversion chip U4, the second voltage terminal Vin2 is connected to the second ground terminal GND through each of the seventh capacitors C7;
a second end of the first switch Q1 is connected to a first ground terminal PE through the first resistor R1, the first running signal input unit Rinx is connected to the first ground terminal PE through the first resistor R1, and a third end of the first optocoupler U1 is connected to a second ground terminal GND through the second resistor R2; alternatively, the first and second electrodes may be,
the pulse input terminal PWMin is connected to a first ground terminal PE through the third resistor R3 and the fourth resistor R4, and the pulse input terminal PWMin is connected to the first ground terminal PE through the first capacitor C1.
10. A charging apparatus comprising the short-circuit detection device according to claim 7 and an auxiliary isolated power supply, the isolated power supply comprises a power conversion chip U4, a first voltage terminal Vin1, a second voltage terminal Vin2, a first ground PE, a second ground GND, at least one sixth capacitor C6 and at least one seventh capacitor C7, the first voltage terminal Vin1 is connected to the voltage input pin Vin of the power conversion chip U4, the first ground terminal PE is connected to the ground input pin Gin of the power conversion chip U4, the first voltage terminal Vin1 is connected to the first ground terminal PE through each of the sixth capacitors C6, the second voltage terminal Vin2 is connected to the voltage output pin Vout of the power conversion chip U4, the second ground terminal GND is connected to the ground output pin Gout of the power conversion chip U4, the second voltage terminal Vin2 is connected to the second ground terminal GND through each of the seventh capacitors C7;
the positive phase input pin INP is connected to a second ground terminal GND through the sixth resistor R6, the positive voltage pin V + of the amplifier U1 is further connected to the second ground terminal GND through the fourth capacitor C4, the negative voltage pin V-of the amplifier U1 is connected to the second ground terminal GND, the second end of the second optocoupler U3 is connected to the second ground terminal GND, and the third end of the second optocoupler U3 is connected to the first ground terminal PE.
11. A charging device comprising the short circuit detection device according to any one of claims 1 to 8, a device activation device and a power supply, wherein the device activation device is configured to turn on the power supply according to an operation signal.
12. The charging apparatus according to claim 11, wherein the apparatus starting device comprises a second operation signal input unit Riny for inputting an operation signal, and a switch circuit connected to the input terminal and the output terminal of the power supply and the second operation signal input unit Riny, respectively, for turning on the input terminal and the output terminal of the power supply according to the operation signal.
13. The charging apparatus as claimed in claim 12, wherein the second running signal input unit Riny includes a third input terminal Rin3 and a fourth input terminal Rin4, the number of the switching circuits is two, the power supply includes two sets of corresponding input terminals and output terminals, and one of the switching circuits is connected to the third input terminal Rin3 and one of the sets of input terminals and output terminals of the power supply; the other switch circuit is correspondingly connected with the fourth input end Rin4 and the other set of input end and output end of the power supply.
14. The charging apparatus of claim 12, wherein the switch circuit comprises a second switch Q2, a third switch Q3, a relay and a third voltage input terminal Vin3, the second running signal input unit Riny is connected to a control terminal of the second switch Q2, a first terminal of the second switch Q2 is grounded, a second terminal of the second switch Q2 is connected to a control terminal of the third switch Q3, a first terminal of the third switch Q3 is connected to the third voltage input terminal Vin3, two terminals of a coil resistor of the relay are respectively connected to a second terminal of the third switch Q3 and the ground, and an input terminal and an output terminal of the power supply are correspondingly connected to two pins of the relay.
15. The charging apparatus of claim 14, wherein the switching circuit further comprises a tenth resistor R10, and the second operation signal input unit Riny is connected to the control terminal of the second switch Q2 through the tenth resistor R10; and/or the presence of a gas in the gas,
the switch circuit further comprises an eleventh resistor R11 and a twelfth resistor R12, wherein the first end of the second switch Q2 is grounded through the eleventh resistor R11, and the control end of the third switch Q3 is connected with the first end of the third switch Q3 through the eleventh resistor R11; and/or the presence of a gas in the gas,
the switch circuit further comprises a thirteenth resistor R13 and an eighth capacitor C8, the third voltage input terminal Vin3 is connected to the first end of the third switch Q3 through the thirteenth resistor R13, the third voltage input terminal Vin3 is further connected to the ground through the thirteenth resistor R13 and the eighth capacitor C8; and/or the presence of a gas in the gas,
the switch circuit further includes at least one ninth capacitor C9, and the second terminal of the third switch Q3 is grounded through each of the ninth capacitors C9.
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| CN201922095984.7U CN211577382U (en) | 2019-11-29 | 2019-11-29 | Short circuit detection device and charging equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112946520A (en) * | 2021-02-04 | 2021-06-11 | 厦门天马微电子有限公司 | Capacitance short circuit detection circuit, display device and capacitance short circuit detection method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112946520A (en) * | 2021-02-04 | 2021-06-11 | 厦门天马微电子有限公司 | Capacitance short circuit detection circuit, display device and capacitance short circuit detection method |
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Effective date of registration: 20210525 Address after: 201613 301 Rong Le Dong Road, Songjiang District, Shanghai. Patentee after: Hengda hengchi New Energy Vehicle Research Institute (Shanghai) Co.,Ltd. Address before: 518000 Room 201, building A, No. 1, Qian Wan Road, Qianhai Shenzhen Hong Kong cooperation zone, Shenzhen, Guangdong (Shenzhen Qianhai business secretary Co., Ltd.) Patentee before: HENGDA SMART CHARGING TECHNOLOGY Co.,Ltd. |