CN215268262U - Isolation device and test system - Google Patents
Isolation device and test system Download PDFInfo
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- CN215268262U CN215268262U CN202120561049.XU CN202120561049U CN215268262U CN 215268262 U CN215268262 U CN 215268262U CN 202120561049 U CN202120561049 U CN 202120561049U CN 215268262 U CN215268262 U CN 215268262U
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Abstract
The utility model discloses an isolating device and test system, the device includes: the power supply isolation unit is electrically connected with the input interface at the power supply input side, is electrically connected with the input interface at the power supply output side, and is provided with grounding ends at the power supply input side and the power supply output side which are mutually independent; the input end of the input side voltage regulating unit is electrically connected with the power supply input side, and the output end of the input side voltage regulating unit is electrically connected with a first power supply pin of the communication isolating unit; the input end of the output side voltage regulating unit is electrically connected with the power supply output side, and the output end of the output side voltage regulating unit is electrically connected with a second power supply pin of the communication isolating unit; and the communication isolation unit is used for carrying out bidirectional transmission on communication signals of the first communication end and the second communication end. The utility model discloses keep apart the design simultaneously to chip power supply and communication, avoid the chip breakdown that hot plug caused in the testing process, it is convenient to use.
Description
Technical Field
The utility model relates to a power electronic technology field especially relates to an isolating device and test system.
Background
Along with the increase of the diversified and intelligent requirements of users on the functions of household appliances, the display screen is widely applied to the field of household appliances, and the display screen needs to be tested in the design and production stage in order to verify the performance parameters of the display screen.
At present, the performance test of the display screen is mainly completed by testing the main control circuit board of the display screen, in the test process of the main control circuit board, 13V voltage is needed to be adopted to supply power to the main control circuit board, meanwhile, communication signal transmission is carried out with the main control circuit board, and communication signals are isolated, however, the power supply voltage of the communication isolation chip on the market is usually 5V, the power supply to the main control circuit board cannot be directly supplied, an independent power supply module is needed to be arranged to supply power to the main control circuit board, the production cost is increased, the power supply circuit of the communication isolation chip is not provided with an isolation function, chip breakdown is easily caused by hot plugging in the test process, and the chip is easily damaged by the peak voltage at the moment of power-on, and potential safety hazards exist.
SUMMERY OF THE UTILITY MODEL
The utility model provides an isolating device keeps apart power supply and communication simultaneously, has solved test system and has kept apart the problem that the security that sets up and arouse totally is low, manufacturing cost is high, reduces the fault rate.
In a first aspect, an embodiment of the present invention provides an isolation device, including: the device comprises a power isolation unit, an input side voltage regulation unit, an output side voltage regulation unit, a communication isolation unit, an input interface and an output interface, wherein the input interface is used for connecting a test upper computer, and the output interface is used for connecting equipment to be tested; the power supply input side of the power supply isolation unit is electrically connected with the input interface, the power supply output side of the power supply isolation unit is electrically connected with the input interface, grounding ends of the power supply input side and the power supply output side are arranged independently, and the power supply isolation unit is used for converting input voltage into output voltage and transmitting the output voltage to the equipment to be tested; the input end of the input side voltage regulating unit is electrically connected with the power supply input side, the output end of the input side voltage regulating unit is electrically connected with a first power supply pin of the communication isolation unit, and the input side voltage regulating unit is used for converting the input voltage into a first stable preset voltage; the input end of the output side voltage regulating unit is electrically connected with the power supply output side, the output end of the output side voltage regulating unit is electrically connected with a second power supply pin of the communication isolation unit, and the output side voltage regulating unit is used for converting the input voltage into a stable second preset voltage; the first communication end of the communication isolation unit is electrically connected with the input interface, the second communication end of the communication isolation unit is electrically connected with the output interface, and the communication isolation unit is used for carrying out bidirectional transmission on communication signals of the first communication end and the second communication end, wherein the communication signals of the first communication end and the communication signals of the second communication end are isolated from each other.
Optionally, the input interface is provided with a first power terminal, a first communication receiving terminal, a first communication transmitting terminal and a first grounding terminal, and the output interface is provided with a second power terminal, a second communication receiving terminal, a second communication transmitting terminal and a second grounding terminal; the voltage input end of the power isolation unit is electrically connected with the first power terminal, the input grounding end of the power isolation unit is electrically connected with the first grounding terminal, the voltage output end of the power isolation unit is electrically connected with the second power terminal, and the output grounding end of the power isolation unit is electrically connected with the second grounding terminal; the first communication end of the communication isolation unit is electrically connected with the first communication receiving terminal and the first communication sending terminal, the second communication end of the communication isolation unit is electrically connected with the second communication receiving terminal and the second communication sending terminal, the input grounding pin of the communication isolation unit is electrically connected with the first grounding terminal, and the output grounding pin of the communication isolation unit is electrically connected with the second grounding terminal.
Optionally, the communication isolation unit includes: the first end of the first capacitor is electrically connected with a first power supply pin of the communication isolation unit, and the second end of the first capacitor is grounded; and the first end of the second capacitor is electrically connected with the second power supply pin of the communication isolation unit, and the second end of the second capacitor is grounded.
Optionally, the power isolation unit includes: the device comprises an isolated DCDC chip, a first diode, a first filtering unit, a second diode and a second filtering unit; the anode of the first diode is electrically connected with the input interface, and the cathode of the first diode is electrically connected with the anode input end of the isolated DCDC chip; the first end of the first filtering unit is electrically connected with the cathode of the first diode, and the second end of the first filtering unit is electrically connected with the cathode input end of the isolated DCDC chip; the anode of the second diode is electrically connected with the anode output end of the isolated DCDC chip, and the cathode of the second diode is electrically connected with the output interface; the first end of the second filtering unit is electrically connected with the cathode of the second diode, and the second end of the second filtering unit is electrically connected with the cathode output end of the isolated DCDC chip; the positive input end of the isolated DCDC chip is further electrically connected with the input end of the input side voltage regulating unit, the negative input end of the isolated DCDC chip is further electrically connected with the grounding end of the power supply input side, and the negative output end of the isolated DCDC chip is further electrically connected with the grounding end of the power supply output side.
Optionally, the first filtering unit includes at least one first filtering capacitor and an electrolytic capacitor, and the first filtering capacitor and the electrolytic capacitor are connected in parallel; the second filtering unit comprises at least one second filtering capacitor, and the at least one second filtering capacitor is connected in parallel.
Optionally, the input-side voltage regulating unit includes a first voltage regulating chip, a first resistor, a third filtering unit, and a fourth filtering unit, a first end of the first resistor is electrically connected to the input interface through a first diode, and a second end of the first resistor is electrically connected to an input end of the first voltage regulating chip; a first end of the third filtering unit is electrically connected with a second end of the first resistor, and a second end of the third filtering unit is electrically connected with a grounding end of the power supply input side; a first end of the fourth filtering unit is electrically connected with an output end of the first voltage regulating chip, and a second end of the fourth filtering unit is electrically connected with a grounding end of the power supply input side; the output side voltage regulating unit comprises a second voltage regulating chip, a second resistor, a fifth filtering unit and a sixth filtering unit, wherein the first end of the second resistor is electrically connected with the output interface, and the second end of the second resistor is electrically connected with the input end of the second voltage regulating chip; a first end of the fifth filtering unit is electrically connected with a second end of the second resistor, and a second end of the fifth filtering unit is electrically connected with a ground end of the power supply output side; and the first end of the sixth filtering unit is electrically connected with the output end of the second voltage regulating chip, and the second end of the sixth filtering unit is electrically connected with the grounding end of the power supply output side.
Optionally, the first voltage regulating chip and the second voltage regulating chip are three-terminal voltage regulators, a ground terminal of the first voltage regulating chip is electrically connected with a ground terminal of the power supply input side, and a ground terminal of the second voltage regulating chip is electrically connected with a ground terminal of the power supply output side.
Optionally, the isolation device further comprises: the printed circuit board, printed circuit board is equipped with and presets circuit and electrically conductive through-hole, predetermine the circuit with the power isolation unit the input side voltage regulating unit the output side voltage regulating unit the communication isolation unit the input interface reaches the output interface electricity is connected.
Optionally, a voltage value of the input voltage is equal to a voltage value of the output voltage, and a voltage value of the first preset voltage is equal to a voltage value of the second preset voltage.
In a second aspect, the embodiment of the present invention further provides a testing system, which includes the above-mentioned isolation device.
The embodiment of the utility model provides a test system sets up isolating device, and this isolating device sets up power isolation unit, input side pressure regulating unit, output side pressure regulating unit, communication isolation unit, input interface and output interface, converts input voltage into output voltage through power isolation unit to transmit output voltage to the equipment under test, and input voltage and output voltage's earthing terminal is independent each other; converting the input voltage into a first stable preset voltage through an input side voltage regulating unit, and converting the input voltage into a second stable preset voltage through an output side voltage regulating unit, wherein the first preset voltage and the second preset voltage respectively supply power to two signal processing channels of the communication isolation unit; the communication isolation unit is used for carrying out bidirectional transmission and isolation on communication signals between the input interface and the output interface, power supply and communication are simultaneously isolated, the problems of low safety and high production cost caused by incomplete isolation setting of the test system are solved, the use is convenient, the product failure rate is favorably reduced, and the production cost is reduced.
Drawings
Fig. 1 is a schematic structural diagram of an isolation device according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of an isolation device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another isolation device according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a test system according to a second embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is the embodiment of the utility model provides a pair of isolating device's schematic structure diagram, this embodiment is applicable to the application scene of supplying power and the two isolations of communication to test host computer and the equipment to be tested in the test process, and wherein, the equipment to be tested adopts the low pressure to supply power, and the integration of test host computer is provided with power supply.
As shown in fig. 1, the isolation device 100 includes: the power isolation unit 10, the input side voltage regulating unit 20, the output side voltage regulating unit 30, the communication isolation unit 40, the input interface JP1 and the output interface JP2, the input interface JP1 is used for connecting the test host computer, and the output interface JP2 is used for connecting the equipment to be tested.
In this embodiment, the device under test may be a main control circuit board of the display, the main control circuit board is powered by low-voltage direct current, and typically, the power supply voltage of the main control circuit board may be direct current 13V.
With continued reference to fig. 1, the power supply input side of the power isolation unit 10 is electrically connected to the input interface JP1, the power supply output side of the power isolation unit 10 is electrically connected to the input interface JP1, the power isolation unit 10 is configured to convert the input voltage Vin into the output voltage Vout and transmit the output voltage Vout to the device under test, the device under test is powered by the output voltage Vout on the power supply output side, and the ground terminal (i.e., the input ground terminal GNDA) on the power supply input side and the ground terminal (i.e., the output ground terminal GNDB) on the power supply output side are independently arranged, so that the input voltage Vin and the output voltage Vout are isolated from each other.
With continued reference to fig. 1, the input terminal of the input side voltage-regulating unit 20 is electrically connected to the power supply input side, the output terminal of the input side voltage-regulating unit 20 is electrically connected to the first power supply pin VDDA of the communication isolating unit 40, and the input side voltage-regulating unit 20 is configured to convert the input voltage into a stable first preset voltage V1; the input end of the output side voltage regulating unit 30 is electrically connected with the power supply output side, the output end of the output side voltage regulating unit 30 is electrically connected with a second power supply pin VDDB of the communication isolating unit 40, and the output side voltage regulating unit 30 is used for converting the input voltage into a stable second preset voltage V2; the first communication terminal of the communication isolation unit 40 is electrically connected to the input interface JP1, the second communication terminal of the communication isolation unit 40 is electrically connected to the output interface JP2, and the communication isolation unit 40 is configured to perform bidirectional transmission of communication signals between the first communication terminal and the second communication terminal, where the communication signals of the first communication terminal and the communication signals of the second communication terminal are isolated from each other.
In this embodiment, the communication isolation unit 40 may be provided with two mutually independent communication transmission channels, the communication signal is transmitted from the test upper computer to the device under test through the input communication transmission channel, the communication signal is transmitted from the device under test to the test upper computer through the output communication transmission channel, the two communication transmission channels are electrically isolated, and the independent power supply is used for supplying power, for example, the device of the input communication transmission channel may be supplied with power through the input side voltage regulating unit 20, and the device of the output communication transmission channel may be supplied with power through the output side voltage regulating unit 30, so that the communication signals between the input interface JP1 and the output interface JP2 are isolated from each other.
Specifically, in the testing process, the input interface JP1 is connected with the testing upper computer through a cable, the output interface JP2 is connected with the device to be tested through a cable, the testing upper computer transmits the input voltage Vin to the power supply input side of the power isolation unit 10 through the input interface JP1, the power isolation unit 10 performs isolation conversion on the input voltage Vin to obtain the output voltage Vout, and the output voltage Vout is transmitted to the device to be tested through the output interface JP2 to supply power to the device to be tested. The test upper computer also transmits the test communication signals to the communication isolation unit 40 through the input interface JP1, the communication isolation unit 40 transmits the test communication signals to the equipment to be tested through the output interface through the input communication transmission channel, receives the feedback communication signals transmitted by the equipment to be tested, and transmits the feedback communication signals to the test upper computer through the output communication transmission channel, so that the simultaneous isolation of power supply and communication is realized, the problems of low safety and high production cost caused by incomplete isolation setting of the test system are solved, the use is convenient, the reduction of the product failure rate is facilitated, and the production cost is reduced.
Alternatively, the voltage value of the input voltage Vin is equal to the voltage value of the output voltage Vout, and the voltage value of the first preset voltage V1 is equal to the voltage value of the second preset voltage V1.
In this embodiment, the voltage value of the input voltage Vin is equal to the voltage value output by the test upper computer, the voltage value of the output voltage Vout is equal to the power supply voltage value of the device under test, the voltage value of the first preset voltage V1 is equal to the power supply voltage value of one communication transmission channel of the communication isolation unit 40, the voltage value of the second preset voltage V2 is equal to the power supply voltage value of the other communication transmission channel of the communication isolation unit 40, and the two communication transmission channels of the communication isolation unit 40 are set to have the same structure, so that the stability of signal transmission can be ensured.
For example, the voltage values of the input voltage Vin and the output voltage Vou may be set to be direct current 13V, and the voltage values of the first preset voltage V1 and the second preset voltage V1 may be set to be 5V, so that full isolation of power supply and communication of a circuit with a power supply voltage of direct current 13V is achieved.
It should be noted that specific values of the input voltage and the output voltage of the power isolation unit 10 may be adjusted according to actual needs, which is not limited to this, and is beneficial to implement full isolation of power supply and communication of the multi-supply-voltage circuit.
Fig. 2 is a schematic circuit diagram of an isolation device according to an embodiment of the present invention.
Alternatively, as shown in fig. 2, the input interface JP1 is provided with a first power terminal VHA, a first communication receiving terminal RXA, a first communication transmitting terminal TXB and a first ground terminal VLA, and the output interface JP2 is provided with a second power terminal VHB, a second communication receiving terminal RXB, a second communication transmitting terminal TXA and a second ground terminal VLB; a voltage input end of the power isolation unit 10 is electrically connected to the first power terminal VHA, an input ground terminal GNDA of the power isolation unit 10 is electrically connected to the first ground terminal VLA, a voltage output end of the power isolation unit 10 is electrically connected to the second power terminal VHB, and an output ground terminal GNDB of the power isolation unit 10 is electrically connected to the second ground terminal VLB; the first communication terminal of the communication isolation unit 40 is electrically connected to the first communication receiving terminal RXA and the first communication transmitting terminal TXB, the second communication terminal of the communication isolation unit 40 is electrically connected to the second communication receiving terminal RXB and the second communication transmitting terminal TXA, the input ground pin GND1 of the communication isolation unit 40 is electrically connected to the first ground terminal VLA, and the output ground pin GND2 of the communication isolation unit 40 is electrically connected to the second ground terminal VLB.
Alternatively, as shown in fig. 2, the communication isolation unit 40 includes: the communication isolation chip U4, the first capacitor C1 and the second capacitor C2, wherein a first end of the first capacitor C1 is electrically connected with a first power supply pin VDDA of the communication isolation unit 40, and a second end of the first capacitor C1 is grounded; a first terminal of the second capacitor C2 is electrically connected to the second power supply pin VDDB of the communication isolating unit 40, and a second terminal of the second capacitor C2 is grounded.
Referring to fig. 2 in combination, a first communication end of the communication isolation chip U4 is provided with a first input pin V0A, a first output pin VIB and an input ground pin GND1, the first input pin V0A of the first communication end is electrically connected to the first communication receiving terminal RXA, and the first output pin VIB is electrically connected to the first communication transmitting terminal TX; the first input pin V0A is used for receiving a communication signal sent by a test upper computer, the first output pin VIB is used for sending the communication signal to the test upper computer, and the input grounding pin GND1 is connected with a grounding end GNDA at the power supply input side; the second communication end of the communication isolation chip U4 is provided with a second input pin V0B, a second output pin VIA and an output ground pin GND2, the second input pin V0B is electrically connected with the second communication receiving terminal RXB, the second output pin VIA is electrically connected with the second communication transmitting terminal TXA, the second input pin V0B is used for receiving a communication signal sent by the device to be tested, the second output pin VIA is used for sending the communication signal to the device to be tested, and the output ground pin GND2 is connected with a ground terminal GNDB on the power supply output side.
In the embodiment, the communication isolation chip U4 may be a dual-channel isolation chip, and typically, the communication rate of the communication isolation chip U4 may reach 20Mb/s, and the transmission rate is fast.
Illustratively, the communication isolation chip U4 may be a dual channel isolation chip of model number ADuM 1201.
Alternatively, as shown in fig. 2, the power isolation unit 10 includes: the isolation type DCDC chip U1, the first diode D1, the first filtering unit 101, the second diode D2 and the second filtering unit 102; the anode of the first diode D1 is electrically connected with the input interface JP1, and the cathode of the first diode D1 is electrically connected with the anode input end VI + of the isolated DCDC chip U1; a first end of the first filtering unit 101 is electrically connected with a cathode of the first diode D1, and a second end of the first filtering unit 101 is electrically connected with a cathode input end VI-of the isolated DCDC chip U1; the anode of the second diode D2 is electrically connected with the anode output terminal VO + of the isolated DCDC chip U1, and the cathode of the second diode D2 is electrically connected with the output interface JP 2; a first end of the second filtering unit 102 is electrically connected with a cathode of the second diode D2, and a second end of the second filtering unit 102 is electrically connected with a cathode output end VO-of the isolated DCDC chip U1; the positive input terminal VI + of the isolated DCDC chip U1 is further electrically connected to the input terminal of the input-side voltage regulating unit 20, the negative input terminal VI-of the isolated DCDC chip U1 is further electrically connected to the ground terminal (i.e., the input ground terminal GNDA) of the power supply input side, and the negative output terminal VO-of the isolated DCDC chip U1 is further electrically connected to the ground terminal (i.e., the output ground terminal GNDB) of the power supply output side.
Optionally, the first filtering unit 101 includes at least one first filtering capacitor and an electrolytic capacitor, and the first filtering capacitor and the electrolytic capacitor are connected in parallel; the second filtering unit 102 includes at least one second filtering capacitor, and the at least one second filtering capacitor is connected in parallel.
For example, the first filtering unit 101 may include an electrolytic capacitor with a withstand voltage of 50V and a capacitor with a capacity of 10uF (i.e., nominal 106 tile capacitance) connected in parallel, and the second filtering unit 102 may include a capacitor with a capacity of 10uF (i.e., nominal 106 tile capacitance) and a capacitor with a capacity of 1uF (i.e., nominal 105 tile capacitance) connected in parallel.
Optionally, the input side voltage regulating unit 20 includes a first voltage regulating chip U2, a first resistor R1, a third filtering unit 201, and a fourth filtering unit 202, a first end of the first resistor R1 is electrically connected to the input interface JP1 through a first diode D1, and a second end of the first resistor R1 is electrically connected to the input end I of the first voltage regulating chip U2; a first terminal of third filter unit 201 is electrically connected to a second terminal of first resistor R1, and a second terminal of third filter unit 201 is electrically connected to a ground terminal on the power supply input side (i.e., input ground terminal GNDA); a first end of the fourth filtering unit 202 is electrically connected to the output end O of the first voltage regulating chip U2, and a second end of the fourth filtering unit 102 is electrically connected to a ground terminal (i.e., the input ground terminal GNDA) on the power supply input side; the output side voltage regulating unit 30 comprises a second voltage regulating chip U3, a second resistor R2, a fifth filtering unit 301 and a sixth filtering unit 302, wherein a first end of the second resistor R2 is electrically connected with the output interface JP2, and a second end of the second resistor R2 is electrically connected with the input end I' of the second voltage regulating chip U3; a first end of the fifth filtering unit 301 is electrically connected to a second end of the second resistor R2, and a second end of the fifth filtering unit 301 is electrically connected to a ground end on the power supply output side; a first end of the sixth filtering unit 302 is electrically connected to the output end O' of the second voltage regulating chip U3, and a second end of the sixth filtering unit 302 is electrically connected to the ground terminal of the power supply output side.
Alternatively, the third filtering unit 201 may comprise a capacitance of 10uF (i.e. nominal 106 tile capacitance) and a capacitance of 1uF (i.e. nominal 105 tile capacitance) connected in parallel; the fourth filtering unit 202 may comprise a capacitance of 0.1uF (i.e., nominal 104 tile capacitance).
Alternatively, the fifth filtering unit 301 may comprise a capacitance of 10uF (i.e. nominal 106 tile capacitance) and a capacitance of 1uF (i.e. nominal 105 tile capacitance) connected in parallel; the sixth filtering unit 302 may comprise a capacitance of 0.1uF (i.e., nominal 104 tile capacitance).
In this embodiment, the input side voltage regulating unit 20 and the output side voltage regulating unit 30 adopt the same circuit structure, and the types and specifications of the components in the circuit are set to be the same, so that the first power supply pin VDDA and the second power supply pin VDDB of the communication isolation chip U4 obtain the same power supply voltage, which is beneficial to realizing the consistency of the input side and the output side and avoiding the noise interference caused by the voltage difference.
Alternatively, the first voltage regulating chip U2 and the second voltage regulating chip U3 may be three-terminal regulators, the ground terminal G of the first voltage regulating chip U2 is electrically connected to the ground terminal (i.e., the input ground terminal GNDA) of the power supply input side, and the ground terminal G' of the second voltage regulating chip U3 is electrically connected to the ground terminal (i.e., the output ground terminal GNDB) of the power supply output side.
Illustratively, the first voltage regulating chip U2 and the second voltage regulating chip U3 may each employ a three-terminal regulator model 78M 05.
Fig. 3 is a schematic structural diagram of another isolation device according to an embodiment of the present invention.
Optionally, as shown in fig. 3, the isolation device 100 further includes: the power isolation unit comprises a printed circuit board 50, wherein the printed circuit board 50 is provided with a preset circuit and a conductive through hole, and the preset circuit is electrically connected with the power isolation unit 10, the input side voltage regulation unit 20, the output side voltage regulation unit 30, the communication isolation unit 40, an input interface JP1 and an output interface JP 2.
In this embodiment, a pad or a solder joint is disposed on a surface of the printed circuit board 50, the power isolation unit 10, the input side voltage regulation unit 20, the output side voltage regulation unit 30, the communication isolation unit 40, the input interface JP1 and the output interface JP2 are disposed on the surface of the printed circuit board 50 through the pad or the solder joint and are electrically connected to a preset circuit through a conductive via, the power isolation unit 10, the input side voltage regulation unit 20, the output side voltage regulation unit 30, the communication isolation unit 40, the input interface JP1 and the output interface JP2 are connected through the preset circuit to form a communication and power transmission circuit structure, and the circuit structure can further perform voltage conversion processing on input voltage to realize full isolation between communication and power supply.
Optionally, the isolation device 100 may further include a package structure, and the package structure packages the isolation device, so that the isolation device is convenient to use.
Example two
Based on the above embodiment, the second embodiment of the present invention provides a testing system, and fig. 4 is a schematic structural diagram of a testing system provided by the second embodiment of the present invention.
As shown in fig. 4, the test system 200 includes the isolation device 100 described above.
In this embodiment, the test system 200 can be used to test a main control circuit board of a display.
The embodiment of the utility model provides a test system sets up isolating device, and this isolating device sets up power isolation unit, input side pressure regulating unit, output side pressure regulating unit, communication isolation unit, input interface and output interface, converts input voltage into output voltage through power isolation unit to transmit output voltage to the equipment under test, and input voltage and output voltage's earthing terminal is independent each other; converting the input voltage into a first stable preset voltage through an input side voltage regulating unit, and converting the input voltage into a second stable preset voltage through an output side voltage regulating unit, wherein the first preset voltage and the second preset voltage respectively supply power to two signal processing channels of the communication isolation unit; the communication isolation unit is used for carrying out bidirectional transmission and isolation on communication signals between the input interface and the output interface, power supply and communication are simultaneously isolated, the problems of low safety and high production cost caused by incomplete isolation setting of the test system are solved, the use is convenient, the product failure rate is favorably reduced, and the production cost is reduced.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (10)
1. An isolation device, comprising: the power isolation unit, the input side voltage regulation unit, the output side voltage regulation unit, the communication isolation unit, the input interface and the output interface;
the power supply input side of the power supply isolation unit is electrically connected with the input interface, the power supply output side of the power supply isolation unit is electrically connected with the input interface, the grounding end of the power supply input side and the grounding end of the power supply output side are arranged independently, the power supply isolation unit is used for converting input voltage into output voltage, the power supply input side is also electrically connected with a first power supply pin of the communication isolation unit through the input side voltage regulation unit, and the power supply output side is also electrically connected with a second power supply pin of the communication isolation unit through the output side voltage regulation unit;
the first communication end of the communication isolation unit is electrically connected with the input interface, the second communication end of the communication isolation unit is electrically connected with the output interface, and the communication isolation unit is used for carrying out bidirectional transmission on communication signals of the first communication end and the second communication end.
2. The isolation device according to claim 1, wherein the input interface is provided with a first power supply terminal, a first communication reception terminal, a first communication transmission terminal, and a first ground terminal, and the output interface is provided with a second power supply terminal, a second communication reception terminal, a second communication transmission terminal, and a second ground terminal, the first ground terminal being electrically connected to a ground terminal of the power supply input side, and the second ground terminal being electrically connected to a ground terminal of the power supply output side.
3. The isolation device of claim 1, wherein the communication isolation unit comprises: the first end of the first capacitor is electrically connected with a first power supply pin of the communication isolation unit, and the second end of the first capacitor is grounded;
and the first end of the second capacitor is electrically connected with the second power supply pin of the communication isolation unit, and the second end of the second capacitor is grounded.
4. The isolation device of claim 1, wherein the power isolation unit comprises: the device comprises an isolated DCDC chip, a first diode, a first filtering unit, a second diode and a second filtering unit;
the anode of the first diode is electrically connected with the input interface, and the cathode of the first diode is electrically connected with the anode input end of the isolated DCDC chip;
the first end of the first filtering unit is electrically connected with the cathode of the first diode, and the second end of the first filtering unit is electrically connected with the cathode input end of the isolated DCDC chip;
the anode of the second diode is electrically connected with the anode output end of the isolated DCDC chip, and the cathode of the second diode is electrically connected with the output interface;
the first end of the second filtering unit is electrically connected with the cathode of the second diode, and the second end of the second filtering unit is electrically connected with the cathode output end of the isolated DCDC chip;
the positive input end of the isolated DCDC chip is further electrically connected with the input end of the input side voltage regulating unit, the negative input end of the isolated DCDC chip is further electrically connected with the grounding end of the power supply input side, and the negative output end of the isolated DCDC chip is further electrically connected with the grounding end of the power supply output side.
5. The isolation device of claim 4, wherein the first filtering unit comprises at least one first filtering capacitor and an electrolytic capacitor, the first filtering capacitor and the electrolytic capacitor being connected in parallel;
the second filtering unit comprises at least one second filtering capacitor, and the at least one second filtering capacitor is connected in parallel.
6. The isolating device according to claim 1, wherein the input side voltage regulating unit comprises a first voltage regulating chip, a first resistor, a third filtering unit and a fourth filtering unit, a first end of the first resistor is electrically connected with the input interface through a first diode, and a second end of the first resistor is electrically connected with an input end of the first voltage regulating chip; a first end of the third filtering unit is electrically connected with a second end of the first resistor, and a second end of the third filtering unit is electrically connected with a grounding end of the power supply input side; a first end of the fourth filtering unit is electrically connected with an output end of the first voltage regulating chip, and a second end of the fourth filtering unit is electrically connected with a grounding end of the power supply input side;
the output side voltage regulating unit comprises a second voltage regulating chip, a second resistor, a fifth filtering unit and a sixth filtering unit, wherein the first end of the second resistor is electrically connected with the output interface, and the second end of the second resistor is electrically connected with the input end of the second voltage regulating chip; a first end of the fifth filtering unit is electrically connected with a second end of the second resistor, and a second end of the fifth filtering unit is electrically connected with a ground end of the power supply output side; and the first end of the sixth filtering unit is electrically connected with the output end of the second voltage regulating chip, and the second end of the sixth filtering unit is electrically connected with the grounding end of the power supply output side.
7. The isolation device of claim 6, wherein the first voltage regulating chip and the second voltage regulating chip are three-terminal voltage regulators, a ground terminal of the first voltage regulating chip is electrically connected with a ground terminal of the power supply input side, and a ground terminal of the second voltage regulating chip is electrically connected with a ground terminal of the power supply output side.
8. The isolation device of any one of claims 1-7, further comprising: the printed circuit board, printed circuit board is equipped with and presets circuit and electrically conductive through-hole, predetermine the circuit with the power isolation unit the input side voltage regulating unit the output side voltage regulating unit the communication isolation unit the input interface reaches the output interface electricity is connected.
9. The isolation device of any of claims 1-7, wherein the voltage value of the input voltage is equal to the voltage value of the output voltage.
10. A test system comprising the isolation device of any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120561049.XU CN215268262U (en) | 2021-03-18 | 2021-03-18 | Isolation device and test system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120561049.XU CN215268262U (en) | 2021-03-18 | 2021-03-18 | Isolation device and test system |
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| Publication Number | Publication Date |
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| CN215268262U true CN215268262U (en) | 2021-12-21 |
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| CN202120561049.XU Active CN215268262U (en) | 2021-03-18 | 2021-03-18 | Isolation device and test system |
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| CN (1) | CN215268262U (en) |
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