Detection circuit, detection device and charging equipment

Abstract

The utility model relates to the technical field of electronic circuits, in particular to a detection circuit, a detection device and charging equipment. The detection circuit comprises a high-voltage circuit, a low-voltage circuit, a transformer, a sampling isolation module and a display module. The high-voltage circuit, the transformer and the low-voltage circuit are electrically connected in sequence, the low-voltage circuit is electrically connected with the display module, and the high-voltage circuit is electrically connected with the display module through the sampling isolation module. According to the detection circuit provided by the utility model, by introducing the sampling isolation module, electrical isolation and signal transmission of the high-voltage circuit and the low-voltage circuit are realized, and meanwhile, all detected electrical parameters can be visually displayed through a single display module; the problem that in the prior art, two different screens are needed to display the parameters of the high-voltage circuit and the low-voltage circuit is solved, the manufacturing cost is reduced, the space is saved, and the user experience is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic circuit technical field, especially a kind of detection circuit, detection device and charging equipment. BACKGROUND

[0002] In prior art for detecting voltage, current, often use the detection circuit containing primary circuit and secondary circuit, this kind of detection circuit will use two different screens in primary circuit side and secondary circuit side respectively, so that the screen of primary circuit side is set to display the electrical parameter of primary circuit side detected, the screen of secondary circuit side is set to display the electrical parameter of secondary circuit side.

[0003] But, in actual application, because high voltage or high current generally exists in primary circuit, the screen set in primary circuit side can be at the risk of electric shock, although modern electronic equipment usually has insulation and isolation and other safety measures, but there is still the risk of accidental electric shock, and voltage peak in primary circuit, electromagnetic interference or other abnormal conditions can cause damage to the screen set in primary circuit side, lead to equipment failure or damage and cause leakage problem, especially when handling high voltage or high power circuit, risk will also rise accordingly;

[0004] In addition, because two different screens need to be used, in addition to the need for additional display screen, additional display control circuit and connector are also needed, lead to increase the manufacturing cost of detection circuit whole, more space also needs to be used simultaneously, and the information may be dispersed by being displayed on two screens respectively, user needs to switch screen back and forth to obtain complete circuit parameter information. UTILITY MODEL CONTENT

[0005] To solve the technical problem that the detection result of the existing detection circuit for high-voltage circuit and low-voltage circuit needs to use two display modules, the utility model provides a detection circuit, a detection device and a charging equipment.

[0006] The utility model discloses a technical problem's scheme is provided with a detection circuit, including high voltage circuit, low voltage circuit, transformer, sampling isolation module and display module, high voltage circuit low voltage circuit and transformer are electric connection in proper order, low voltage circuit with display module electric connection, high voltage circuit passes through sampling isolation module with display module electric connection, sampling isolation module includes voltage signal sampling isolation circuit, voltage signal sampling isolation circuit's input with high voltage circuit electric connection, voltage signal sampling isolation circuit's output with display module electric connection, voltage signal sampling isolation circuit includes signal conversion module and first isolation circuit, signal conversion module's input with high voltage circuit electric connection, signal conversion module's output with the input of isolation circuit links to each other, isolation circuit's output with display module electric connection.

[0007] Preferably, the high voltage circuit is an alternating current circuit, the high voltage circuit includes a live wire and a neutral wire, the neutral wire is connected in series with a resistor, and the input and output ends of the resistor are connected to the input end of the signal conversion module.

[0008] Preferably, the sampling isolation module further includes a current signal sampling isolation circuit, the input end of the current signal sampling isolation circuit is electrically connected to the high voltage circuit, and the output end of the current signal sampling isolation circuit is electrically connected to the display module.

[0009] Preferably, the current signal sampling isolation circuit includes an integrated acquisition isolation module.

[0010] Preferably, the current signal sampling isolation circuit includes a signal acquisition module and a second isolation circuit, the input end of the signal acquisition module is electrically connected to the high voltage circuit, the output end of the signal acquisition module is electrically connected to the input end of the second isolation circuit, and the output end of the second isolation circuit is electrically connected to the display module.

[0011] Preferably, the first isolation circuit is one of a mutual inductor, an optical coupler, or an optical isolation module; and the second isolation circuit is one of a mutual inductor, an optical coupler, or an optical isolation module.

[0012] Another scheme for solving the technical problem of the utility model is to provide a detection device including the detection circuit as described above.

[0013] Another scheme for solving the technical problem of the utility model is to provide a charging device including a charging circuit and the detection circuit as described above, and the charging circuit and the detection circuit are electrically connected.

[0014] Compared with the prior art, the detection circuit, the detection device, and the charging device have the following advantages:

[0015] 1. The utility model discloses an embodiment of a detection circuit includes high voltage circuit, low voltage circuit, transformer, sampling isolation module and display module, and the technical scheme is through electric connection these components, realizes the electrical isolation and signal transmission of high voltage circuit and low voltage circuit, guarantees all the electrical parameters of detection can be directly displayed through single display module, solves the problem of two different screens of traditional technology and displays high voltage circuit and low voltage circuit parameter respectively, reduces manufacturing cost, saves the space, improves user experience, specifically, introduce sampling isolation module in this scheme, let high voltage circuit pass through sampling isolation module and display module electric connection, this makes display module no longer directly expose in high voltage environment, also improves the security of equipment.

[0016] 2. The utility model discloses an embodiment of sampling isolation module includes voltage signal sampling isolation circuit, so that the voltage signal of high voltage circuit is directly, safely converted and is passed to the display module after isolation, avoids the risk of high voltage direct access low voltage area, improves the stability and security of circuit.

[0017] 3. The utility model discloses an embodiment of voltage signal sampling isolation circuit includes signal conversion module and first isolation circuit. Signal conversion module is responsible for converting the voltage signal of high voltage circuit into the form suitable for processing, and the first isolation circuit ensures the isolated transmission of the converted signal. This design effectively suppresses the direct impact of high voltage on low voltage part, while ensuring the integrity of the signal, improving the stability and safety of detection.

[0018] 4. The utility model discloses an embodiment of detection circuit through the series resistance on the zero line of high voltage circuit, so that the voltage signal sampling isolation circuit in this embodiment not only provides an effective way for current signal collection, but also indirectly realizes the measurement of current signal by cooperating with the series resistance on the zero line, so that the current and voltage can share a set of sampling isolation circuit, realizing the simplified and efficient circuit design. At the same time, the resistance introduced in the high voltage circuit also plays a certain current limiting and protection role, which can limit the impact of excessive current on other parts of the circuit, enhancing the safety and stability of the whole detection system. At the same time, collecting current information in this way can avoid the safety hazards that may be caused by directly detecting current on the high voltage loop.

[0019] 5. The utility model discloses an embodiment of sampling isolation module also includes current signal sampling isolation circuit, introduces current signal sampling isolation circuit, so that the current signal can also be safely and accurately detected and transmitted to the display module, which adds current detection function to the detection circuit, so that the equipment can provide more comprehensive electrical parameter information, improving the comprehensiveness of detection.

[0020] 6. The current signal sampling isolation circuit of the embodiment of the utility model can adopt integrated collection isolation module, which simplifies the circuit structure, improves the integration level, reduces the manufacturing cost, and maintains the detection accuracy.

[0021] 7. The signal collection module and the second isolation circuit are adopted in the current signal sampling isolation circuit of the embodiment of the utility model, which enhances the processing capacity and isolation effect of the current signal, and ensures the stability and safety of the current measurement.

[0022] 8. The first isolation circuit and the second isolation circuit of the embodiment of the utility model have various setting modes, and the most suitable isolation mode can be selected according to the actual application scene, so as to achieve the best performance and cost benefit.

[0023] 9. The embodiment of the utility model further provides a detection device, which has the beneficial effects consistent with the above-mentioned detection circuit, and details are not repeated here.

[0024] 10. The embodiment of the utility model further provides a charging device, which has the beneficial effects consistent with the above-mentioned detection circuit, and details are not repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a circuit framework diagram of the prior art.

[0026] Figure 2 is a circuit framework diagram of a detection circuit provided by the embodiment of the utility model.

[0027] Figure 3 is a circuit principle of a detection circuit provided by the embodiment of the utility model Figure 1 .

[0028] Figure 4 is a circuit principle of a detection circuit provided by the embodiment of the utility model Figure 2 .

[0029] Figure 5 is a circuit principle of a detection circuit provided by the embodiment of the utility model Figure 3 .

[0030] Figure 6 is a circuit principle of a detection circuit provided by the embodiment of the utility model Figure 4 .

[0031] Figure 7 is a circuit principle of a detection circuit provided by the embodiment of the utility model Figure 5 .

[0032] Figure 8 is a circuit principle of a detection circuit provided by the embodiment of the utility model Figure 6 .

[0033] Figure 9 The circuit principle of the detection circuit is provided in the embodiment of the utility model Figure 7 .

[0034] Figure 10 The frame schematic diagram of the charging equipment is provided in the embodiment of the utility model.

[0035] The figure mark explanation is as follows:

[0036] 100, charging equipment; 10, charging circuit; 20, detection circuit;

[0037] 1, high voltage circuit; 2, low voltage circuit; 3, transformer; 4, sampling isolation module; 41, voltage signal sampling isolation circuit; 411, signal conversion module; 412, first isolation circuit; 42, current signal sampling isolation circuit; 421, signal acquisition module; 422, second isolation circuit; 5, display module; 51, signal sampling module; 52, driving module; 53, display screen. Specific implementation

[0038] In order to make the purpose of the utility model, technical scheme and advantage more clear and obvious, the utility model is further described in detail in the following with the help of the drawings and the implementation examples. It should be understood that the specific examples described herein are only used to explain the utility model, and are not used to limit the utility model.

[0039] It should be noted that the terms "first" and "second" in the specification and claims of the utility model are used to distinguish different objects, not to describe a specific order.

[0040] It should be noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there can be a middle element. When an element is considered "connected" to another element, it can be directly connected to the other element or there can be a middle element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0041] In the utility model, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "transverse", "longitudinal" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the utility model and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0042] And, in addition to the above-mentioned part of the term can be used to indicate the orientation or position relationship, but also can be used to represent other meanings, for example, the term "upper" in some cases can also be used to represent a certain dependent relationship or connection relationship. For those skilled in the art, the specific meaning of these terms in the utility model can be understood according to the specific circumstances.

[0043] In addition, the terms "mounting", "setting", "provided with", "connection", "connected" should be broadly understood. For example, it can be fixedly connected, detachably connected, or integrally configured; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0044] Please refer to Figure 1 For the convenience of understanding the scheme, a brief introduction to the prior art is given:

[0045] Figure 1 The circuit framework of the prior art is, Figure 1 The high-voltage circuit in the circuit is used to receive the power signal of the device to be tested as the input end and convert it into a voltage signal for transmission; the low-voltage circuit is used to receive the voltage signal sent by the high-voltage circuit and convert it into a digital signal for transmission; the transformer is arranged between the high-voltage circuit and the low-voltage circuit, and is used to transmit the voltage signal of the high-voltage circuit to the low-voltage circuit according to a preset ratio; at the same time, the high-voltage circuit and the low-voltage circuit respectively adopt different display modules to collect and display signals. It should be noted that the high-voltage circuit is the high-voltage end in the detection circuit, the low-voltage circuit is the secondary low-voltage end in the detection circuit, and the secondary low-voltage end is the secondary side low-voltage end in the power system, which is generally used to access devices or systems with lower voltage.

[0046] Please refer to Figure 2 The utility model discloses a detection circuit, comprising a high-voltage circuit 1, a low-voltage circuit 2, a transformer 3, a sampling isolation module 4 and a display module 5; the high-voltage circuit 1, the transformer 3 and the low-voltage circuit 2 are electrically connected in turn, the low-voltage circuit 2 is electrically connected with the display module 5, and the high-voltage circuit 1 is electrically connected with the display module 5 through the sampling isolation module 4.

[0047] Understandably, the utility model discloses a kind of detection circuit comprising high voltage circuit 1, low voltage circuit 2, transformer 3, sampling isolation module 4 and display module 5, the technical solution is electrically connected these components, realize the electrical isolation and signal transmission of high voltage circuit 1 and low voltage circuit 2, while ensuring that all detected electrical parameters can be directly displayed by single display module 5, solve the problem that two different screens are needed to display high voltage circuit 1 and low voltage circuit 2 parameters in traditional technology, reduce manufacturing cost, save space, improve user experience;Specifically, in the present scheme, sampling isolation module 4 is introduced, so that high voltage circuit 1 is electrically connected with display module 5 by sampling isolation module 4, which makes display module 5 no longer directly exposed to high-voltage environment, and also improves the safety of equipment.

[0048] As an optional implementation, the electrical parameters of the device to be measured displayed by the display module 5 include the voltage, current and / or power of the device to be measured.

[0049] As a feasible implementation, the transformer 3 includes a high-voltage side coil arranged in the high-voltage circuit 1, a low-voltage side coil arranged in the low-voltage circuit 2, and a core magnetic circuit for connecting the high-voltage side coil and the low-voltage side coil, the number of turns of the high-voltage side coil is less than the number of turns of the low-voltage side coil;In one specific embodiment, the ratio of the number of turns of the low-voltage side coil to the number of turns of the high-voltage side coil is the preset ratio.

[0050] Specifically, the high-voltage side coil is responsible for receiving and transmitting the voltage signal output by the high-voltage circuit 1, the core magnetic circuit connects the high-voltage side coil and the low-voltage side coil, and the low-voltage side coil is responsible for receiving and transmitting the processed voltage signal;The core magnetic circuit can be made of ferromagnetic material, and the core magnetic circuit can guide the magnetic field and transmit the signal, which can effectively concentrate and transmit the magnetic field, improve the transformer 3 coefficient and transmission efficiency.

[0051] Also need to be explained is that when the high-voltage circuit 1 outputs the voltage signal through the high-voltage side coil, the current in the high-voltage side coil will generate a magnetic field, and the change of the magnetic field will in turn generate an induced electromotive force in the core magnetic circuit, which will excite the current in the low-voltage side coil, so that the voltage signal corresponding to the high-voltage circuit 1 is generated in the low-voltage circuit 2, the scheme proposed in the present embodiment realizes the transmission of the voltage signal of the high-voltage circuit 1 to the low-voltage circuit 2 by reasonably designing the parameters of the high-voltage side coil, the low-voltage side coil and the core magnetic circuit;Specifically, the preset ratio is not less than 10, in one specific embodiment, the preset ratio is 100:1, and in other embodiments, other preset ratios can be set, such as 50:1, 200:1, etc.

[0052] Further, the transformer 3 in the detection circuit proposed in the embodiment realizes the function of AC isolation by hindering the flow of AC signals, AC isolation refers to taking measures in the circuit so that the AC signals between the input and output of the circuit are not directly connected, AC isolation is usually used to protect personnel safety and circuit stability to protect the circuit and user safety, the main use of the detection circuit proposed in the embodiment is to isolate the AC signals between the input and output;

[0053] Since there may be a high voltage difference between the high-voltage circuit 1 as the input end of the detection circuit and the low-voltage circuit 2 as the output end of the detection circuit, by using the transformer 3, the high-voltage circuit 1 and the low-voltage circuit 2 can be coupled through the transformer 3, so as to realize signal transmission, while blocking the high voltage and noise signal in the high-voltage circuit 11, protecting the low-voltage circuit 2 from the high-voltage circuit 1, to ensure the stable work of the low-voltage circuit 2.

[0054] As a feasible implementation manner, the display module 5 includes a signal sampling module 51, a driving module 52 and a display screen 53 which are electrically connected in sequence. It can be understood that the signal sampling module 51 is located at the front end of the display link, which is directly connected with the signal source in the detection circuit or system, and is responsible for accurately collecting and preliminarily processing the original electrical signal. This step ensures the purity and integrity of the signal, reduces the burden of the subsequent processing link, and improves the efficiency and accuracy of signal processing. The driving module 52 follows the signal sampling module 51, and its role is to convert the signal output by the sampling module into a format or level suitable for the display module 5 to receive. The existence of the driving module 52 can enhance the driving force of the signal, ensure the intensity and stability of the signal in the transmission process, especially in long-distance transmission or in an environment with interference, which is crucial for display clarity and stability. Through the isolation design of the signal sampling module 51 and the driving module 52, the high-voltage or high-current signal can be effectively prevented from directly connecting the sensitive display module 5, reducing the electrical risk and enhancing the overall safety and stability of the system.

[0055] Further, please refer to Figure 3 , the sampling isolation module 4 includes a voltage signal sampling isolation circuit 41, the input end of the voltage signal sampling isolation circuit 41 is electrically connected with the high-voltage circuit 1, and the output end of the voltage signal sampling isolation circuit 41 is electrically connected with the display module 5.

[0056] It can be understood that the sampling isolation module 4 of the embodiment of the utility model includes the voltage signal sampling isolation circuit 41, so that the voltage signal of the high-voltage circuit 1 is directly and safely converted and transmitted to the display module 5 after isolation, avoiding the risk of high voltage directly entering the low-voltage area, and improving the stability and safety of the circuit.

[0057] Further, please refer toFigure 4 The voltage signal sampling isolation circuit 41 comprises a signal conversion module 411 and a first isolation circuit 412, an input end of the signal conversion module 411 is electrically connected with the high-voltage circuit 1, an output end of the signal conversion module 411 is connected with an input end of the isolation circuit, and an output end of the isolation circuit is electrically connected with the display module 5.

[0058] It can be understood that the voltage signal sampling isolation circuit 41 of the embodiment of the utility model comprises a signal conversion module 411 and a first isolation circuit 412. The signal conversion module 411 is responsible for converting the voltage signal of the high-voltage circuit 1 into a form suitable for processing, and the first isolation circuit 412 ensures the isolated transmission of the converted signal. This design effectively suppresses the direct impact of high voltage on the low-voltage part, while ensuring the integrity of the signal and improving the stability and safety of detection.

[0059] As a feasible implementation manner, referring to Figure 5 The high-voltage circuit 1 is an alternating current circuit, the high-voltage circuit 1 comprises a live wire L and a zero wire N, a resistor Rcs1 is connected in series on the zero wire N, and an input end and an output end of the resistor Rcs1 are connected with an input end of the signal conversion module 411 respectively.

[0060] It can be understood that the detection circuit of the embodiment of the utility model makes the voltage signal sampling isolation circuit 41 in the embodiment not only provide an effective way for the collection of current signal by connecting a resistor in series on the zero wire of the high-voltage circuit 1, but also indirectly realize the measurement of the current signal through the cooperation with the resistor connected in series on the zero wire, so that the current and the voltage can share a set of sampling isolation circuit, that is, only one set of first isolation circuit is needed, realizing the simplified and efficient circuit design. At the same time, the resistor introduced in the high-voltage circuit 1 also plays a certain current limiting and protection role, which can limit the impact on other parts of the circuit when the current is too large, thereby enhancing the safety and stability of the whole detection system. At the same time, the current information is collected in this way, which avoids the safety hidden danger that may be caused by directly detecting the current on the high-voltage loop.

[0061] As a feasible implementation manner, a bridge rectifier BD1 is further arranged in the detection circuit, the bridge rectifier BD1 is arranged in the high-voltage circuit 1 and connected with the high-voltage side coil, so as to receive the power supply signal of the device to be detected and convert the power supply signal into a voltage signal for transmission. In Figure 5 The bridge rectifier BD1 arranged in the high-voltage circuit 1 is used to convert the alternating current signal into a direct current signal.

[0062] As a feasible implementation manner, referring to Figure 3The sampling isolation module 4 further comprises a current signal sampling isolation circuit 42, an input end of the current signal sampling isolation circuit 42 is electrically connected with the high-voltage circuit 1, and an output end of the current signal sampling isolation circuit 42 is electrically connected with the display module 5.

[0063] Understandably, the sampling isolation module 4 of the embodiment of the utility model further comprises a current signal sampling isolation circuit 42, the current signal sampling isolation circuit 42 is introduced, so that the current signal can also be safely and accurately detected and transmitted to the display module 5, which adds the current detection function to the detection circuit, so that the device can provide more comprehensive electrical parameter information, and the comprehensiveness of detection is improved.

[0064] As a feasible implementation mode, refer to Figure 6 The current signal sampling isolation circuit 42 comprises an integrated acquisition isolation module.

[0065] Understandably, the current signal sampling isolation circuit 42 of the embodiment of the utility model can adopt an integrated acquisition isolation module, which simplifies the circuit structure, improves the integration, reduces the manufacturing cost, and at the same time maintains the accuracy of detection.

[0066] As a feasible implementation mode, refer to Figure 7 The current signal sampling isolation circuit 42 comprises a signal acquisition module 421 and a second isolation circuit 422, an input end of the signal acquisition module 421 is electrically connected with the high-voltage circuit 1, an output end of the signal acquisition module 421 is electrically connected with an input end of the second isolation circuit 422, and an output end of the second isolation circuit 422 is electrically connected with the display module.

[0067] Understandably, the signal acquisition module 421 and the second isolation circuit 422 are adopted in the current signal sampling isolation circuit 42 of the embodiment of the utility model, the processing capacity and the isolation effect of the current signal are enhanced, and the stability and the safety of current measurement are ensured.

[0068] As a feasible implementation mode, refer to Figure 8 And Figure 9 The first isolation circuit 412 is one of a mutual inductor, an optical coupler or an optical isolation module, and the second isolation circuit 422 is one of a mutual inductor, an optical coupler or an optical isolation module.

[0069] Understandably, the setting mode of the first isolation circuit 412 and the second isolation circuit 422 of the embodiment of the utility model is various, and the most suitable isolation mode can be selected according to the actual application scene, so that the best performance and cost benefit are achieved.

[0070] Specifically, Figure 8The first isolation circuit 412 and the second isolation circuit 422 both adopt the implementation of the optical isolation module in the first embodiment shown in FIG. 1. Figure 9 The first isolation circuit 412 adopts the implementation of the mutual inductor, and the second isolation circuit 422 adopts the implementation of the optical isolation module in the second embodiment shown in FIG. 2.

[0071] The second embodiment of the utility model provides a detection device, including detection circuit 20 as described above.

[0072] It can be understood that the detection device has the beneficial effects consistent with the above-mentioned detection circuit 20, which will not be repeated here.

[0073] Please refer to Figure 10 The third embodiment of the utility model provides a charging device 100, including a charging circuit 10 and a detection circuit 20 as described above, and the charging circuit 10 and the detection circuit 20 are electrically connected.

[0074] It can be understood that the charging device 100 has the beneficial effects consistent with the above-mentioned detection circuit 20, which will not be repeated here.

[0075] As a feasible implementation, the charging device 100 can include but is not limited to a charging line, a charging head, a single-channel fast charger, a multi-channel fast charger, a wireless charger, a power strip or a mobile power supply. Through the detection circuit 20 provided by the charging device, users can conveniently check the real-time status of the charging device during use.

[0076] The detection circuit 20 in the first embodiment of the utility model can be conveniently connected with the output end or the input end of the charging device 100 to realize the detection of the electrical parameters of the specific point, and in the embodiment, the charging circuit 10 includes at least one input end interface and at least one output end interface, the input end interface is used for connecting with an external power supply, and the charging circuit 10 can be connected with the input end of the high-voltage circuit through the charging input end and / or the charging output end;

[0077] In a specific embodiment, the input end interface of the charging circuit 10 can be used as an output end interface at the same time, and the output end interface of the charging circuit 10 can also be used as an input end interface.

[0078] Preferably, the charging device provided in the embodiment further includes a on-off circuit arranged at the input end of the charging device, and the detection circuit 20 can also detect the power of the electronic device connected with the charging device, so that when the power of the electronic device is full, the input end of the charging device and the external power supply are automatically disconnected through the on-off circuit.

[0079] In summary, the utility model provides a kind of detection circuit 20 and the detection device and charging equipment comprising the detection circuit 20, the utility model proposes scheme to realize the effective transmission and conversion of voltage signal, the high-low voltage alternating current isolation in electrical system is realized by the transformer of being set, the accuracy and stability of detection are improved, the safety and stability of entire circuit are guaranteed, only one display module can directly, comprehensively show the electrical parameter of device to be measured.

[0080] Compared with the prior art, the utility model provides a kind of detection circuit, detection device and charging equipment, with the following advantages:

[0081] 1.The utility model embodiment provides a kind of detection circuit, including high voltage circuit, low voltage circuit, transformer, sampling isolation module and display module, and the technical scheme is connected by electrical property these components, realizes the electrical isolation and signal transmission of high voltage circuit and low voltage circuit, simultaneously ensures that all detected electrical parameters can be directly shown by single display module, solves the problem of needing two different screens to display high voltage circuit and low voltage circuit parameter in traditional technology, reduces manufacturing cost, saves space, improves user experience;Specifically, in the present scheme, sampling isolation module is introduced, so that high voltage circuit is electrically connected with display module by sampling isolation module, so that display module is no longer directly exposed to high voltage environment, and the safety of equipment is also improved.

[0082] 2.The sampling isolation module of the utility model embodiment includes voltage signal sampling isolation circuit, so that the voltage signal of high voltage circuit is directly and safely converted and transmitted to display module after isolation, avoiding the risk of high voltage directly entering low voltage area, and improving the stability and safety of circuit.

[0083] 3.The voltage signal sampling isolation circuit of the utility model embodiment includes signal conversion module and first isolation circuit.Signal conversion module is responsible for converting the voltage signal of high voltage circuit into a form suitable for processing, while the first isolation circuit ensures the isolated transmission of the converted signal.This design effectively suppresses the direct impact of high voltage on low voltage part, while ensuring the integrity of the signal, improving the stability and safety of detection.

[0084] 4. The detection circuit of the embodiment of the utility model, through the series resistance on the zero line of high voltage circuit, makes that the voltage signal sampling isolation circuit in this embodiment not only provides an effective way for the collection of current signal, through the cooperation of series resistance on the zero line, also indirectly realizes the measurement of current signal, so that the current and voltage can share a set of sampling isolation circuit, realizes the simplified and efficient circuit design; At the same time, the resistance introduced in the high voltage circuit also plays a certain current limiting and protection effect, can limit the impact on other parts of the circuit when the current is too large, enhances the safety and stability of the whole detection system. At the same time, through this way, the current information is collected, which avoids the security risks that may be caused by directly detecting the current on the high voltage loop.

[0085] 5. The sampling isolation module of the embodiment of the utility model still includes current signal sampling isolation circuit, introduces current signal sampling isolation circuit, so that the current signal can also be safely and accurately detected and transmitted to the display module, which adds current detection function to the detection circuit, so that the device can provide more comprehensive electrical parameter information, and the comprehensiveness of detection is improved.

[0086] 6. The current signal sampling isolation circuit of the embodiment of the utility model can adopt an integrated collection isolation module, which simplifies the circuit structure, improves the integration, reduces the manufacturing cost, and at the same time maintains the accuracy of detection.

[0087] 7. The signal collection module and the second isolation circuit are used in the current signal sampling isolation circuit of the embodiment of the utility model, which enhances the processing capacity and isolation effect of the current signal, and ensures the stability and safety of current measurement.

[0088] 8. The setting mode of the first isolation circuit and the second isolation circuit of the embodiment of the utility model is various, and the most suitable isolation mode can be selected according to the actual application scene, so as to achieve the best performance and cost benefit.

[0089] 9. The embodiment of the utility model further provides a detection device, which has the beneficial effects consistent with the above-mentioned detection circuit, and details are not repeated here.

[0090] 10. The embodiment of the utility model further provides a charging device, which has the beneficial effects consistent with the above-mentioned detection circuit, and details are not repeated here.

[0091] The above only describes the preferred embodiments of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement within the principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A detection circuit, characterized by: The detection circuit comprises a high-voltage circuit, a low-voltage circuit, a transformer, a sampling isolation module and a display module; the high-voltage circuit, the transformer and the low-voltage circuit are sequentially electrically connected, the low-voltage circuit is electrically connected with the display module, the high-voltage circuit is electrically connected with the display module through the sampling isolation module; the sampling isolation module comprises a voltage signal sampling isolation circuit, an input end of the voltage signal sampling isolation circuit is electrically connected with the high-voltage circuit, and an output end of the voltage signal sampling isolation circuit is electrically connected with the display module; the voltage signal sampling isolation circuit comprises a signal conversion module and a first isolation circuit, an input end of the signal conversion module is electrically connected with the high-voltage circuit, an output end of the signal conversion module is connected with an input end of the isolation circuit, and an output end of the isolation circuit is electrically connected with the display module.

2. The detection circuit of claim 1, wherein: The high-voltage circuit is an alternating current circuit, the high-voltage circuit comprises a live wire and a zero wire, a resistor is connected in series on the zero wire, and an input end and an output end of the resistor are connected with the input end of the signal conversion module respectively.

3. The detection circuit of claim 1, wherein: The sampling isolation module further comprises a current signal sampling isolation circuit, an input end of the current signal sampling isolation circuit is electrically connected with the high-voltage circuit, and an output end of the current signal sampling isolation circuit is electrically connected with the display module.

4. The detection circuit of claim 3, wherein: The current signal sampling isolation circuit comprises an integrated acquisition isolation module.

5. The detection circuit of claim 3, wherein: The current signal sampling isolation circuit comprises a signal acquisition module and a second isolation circuit, an input end of the signal acquisition module is electrically connected with the high-voltage circuit, an output end of the signal acquisition module is electrically connected with an input end of the second isolation circuit, and an output end of the second isolation circuit is electrically connected with the display module.

6. The detection circuit of claim 5, wherein: The first isolation circuit is one of a mutual inductor, an optical coupler or an optical isolation module; and the second isolation circuit is one of a mutual inductor, an optical coupler or an optical isolation module.

7. A detection device characterized by: The detection circuit comprises the detection circuit according to any one of claims 1-6.

8. A charging device, characterized by: The detection circuit comprises the detection circuit according to any one of claims 1-6.

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