CN211402542U - Be applicable to rush-harvesting and rush-planting machine double-circuit insulation resistance detection circuitry that charges - Google Patents
Be applicable to rush-harvesting and rush-planting machine double-circuit insulation resistance detection circuitry that charges Download PDFInfo
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- CN211402542U CN211402542U CN201921982207.8U CN201921982207U CN211402542U CN 211402542 U CN211402542 U CN 211402542U CN 201921982207 U CN201921982207 U CN 201921982207U CN 211402542 U CN211402542 U CN 211402542U
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Abstract
The utility model discloses a be applicable to rush-harvesting battery double-circuit insulation resistance detection circuitry belongs to the technical field who charges the machine, including the first direct current output and the second direct current output that charge the machine, still include switching circuit, unbalanced bridge circuit and difference sampling circuit, first direct current output and second direct current output insert alone to unbalanced bridge circuit through switching circuit respectively in, unbalanced bridge circuit is connected with difference sampling circuit to calculate first direct current output or second direct current output's positive, negative pole insulation resistance value to ground through difference sampling circuit, in order to reach and to realize that a balanced bridge detects the insulation resistance in two return circuits, have the advantage of saving cost and inner space.
Description
Technical Field
The utility model belongs to the technical field of the machine that charges, particularly, relate to a be applicable to double-gun quick-witted double-circuit insulation resistance detection circuitry that charges.
Background
With the development of new energy electric vehicles, the social demand on chargers is increasing, the development of the charger industry is also more standardized, and the latest general requirements of the GBT18487.1-2015 charging system require that insulation detection must be performed on the whole line before charging begins, so that the demand for developing an insulation detection scheme for the chargers is met.
The insulation detection function of the existing charger is mostly completed by an independent detection module, and the insulation detection module used in the existing direct current system is generally used for measuring the insulation resistance of a positive bus and a negative bus to the ground, but the insulation detection in the prior art has the following problems:
(1) the traditional insulation resistance detection circuits are all insulation resistances of which one circuit can only detect one loop, if a plurality of loops need to be detected, a plurality of detection circuits need to be used, so that the cost is high and the detection operation difficulty is high;
(2) the multi-path detection insulation detection circuit is also completed through a multi-path unbalanced bridge circuit, so that the cost and the system complexity are improved;
(3) if the existing insulation detection module is used in the double-gun charger, more internal space is occupied, and meanwhile, the cost is increased.
SUMMERY OF THE UTILITY MODEL
In view of this, in order to solve the above-mentioned problem that prior art exists, the utility model aims to provide an insulation resistance detection circuitry is in order to reach and to realize that a balanced electric bridge detects to the insulation resistance in two return circuits in order to be applicable to the rush-harvesting battery double-circuit, has the advantage of saving cost and inner space.
The utility model discloses the technical scheme who adopts does: the double-path insulation resistance detection circuit suitable for the double-gun charger comprises a first direct current output and a second direct current output of the charger, and further comprises a switching circuit, an unbalanced bridge circuit and a differential sampling circuit, wherein the first direct current output and the second direct current output are respectively and independently connected into the unbalanced bridge circuit through the switching circuit, the unbalanced bridge circuit is connected with the differential sampling circuit, and the insulation resistance values of the positive pole and the negative pole of the first direct current output or the second direct current output to the ground are calculated through the differential sampling circuit.
Further, the switching circuit comprises a first relay and a second relay, the positive pole and the negative pole of the first direct current output are respectively connected with the normally closed ends of the first relay and the second relay, the positive pole and the negative pole of the second direct current output are respectively connected with the normally open ends of the first relay and the second relay, the common ends of the first relay and the second relay are respectively connected to the unbalanced bridge circuit, and the first direct current output and the second direct current output are connected to the unbalanced bridge circuit to be switched through control over the first relay and the second relay.
Furthermore, the first relay and the second relay are both single-pole double-throw relays so as to meet the switching function of the circuit.
Further, the unbalanced bridge circuit comprises a first bridge and a second bridge, a common end of the first relay, a common end of the first bridge, a common end of the second bridge and a common end of the second relay are sequentially connected in series, a connection common point of the first bridge and the second bridge is grounded through a third switch, two ends of the first bridge and two ends of the second bridge are both connected to the differential sampling circuit, and the unbalanced bridge circuit can be respectively suitable for first direct current output and second direct current output.
Furthermore, the first bridge comprises a first resistor and a first switch which are connected in series, the second bridge comprises a second resistor and a second switch which are connected in series, and the circuit required by the measurement of the insulation resistance of the positive pole and the negative pole of the first direct current output and the second direct current output to the ground is met through the matching of the first switch, the second switch and the third switch.
Furthermore, the differential sampling circuit comprises a first differential amplifier, a second differential amplifier and a single chip microcomputer, wherein the output ends of the first differential amplifier and the second differential amplifier are connected with the single chip microcomputer, the two ends of the input end of the first differential amplifier are respectively connected with the two ends of the first bridge, the two ends of the input end of the second differential amplifier are respectively connected with the two ends of the second bridge, and the measured voltage is amplified through the first differential amplifier and the second differential amplifier.
Furthermore, the control ends of the first relay, the second relay, the first switch, the second switch and the third switch are all in communication connection with the single chip microcomputer, so that the detection circuit can automatically measure the insulation resistance values of the positive pole and the negative pole of the first direct current output and the second direct current output to the ground.
Furthermore, the switching circuit, the unbalanced bridge circuit and the differential sampling circuit are arranged integrally or in a split mode, so that the application range of the detection circuit is widened, and the wide popularization of the detection circuit is facilitated.
Furthermore, the single chip microcomputer is in communication connection with an upper computer through a communication interface so as to transmit and feed back the measurement result in time.
The utility model has the advantages that:
1. adopt the utility model provides a be applicable to double-gun charger double-circuit insulation resistance detection circuitry, realize two direct current output through the switching circuit in this circuit just, the negative pole inserts to unbalanced bridge circuit respectively alone, carry out voltage acquisition and do corresponding calculation to unbalanced bridge circuit under differential sampling circuit's effect, with the measurement acquire first direct current output or second direct current output just, the negative pole is to the insulation resistance value on ground, finally realized detecting the insulation resistance value in two return circuits, it is compared in traditional method, it need not a plurality of detection circuitry, also need not a plurality of unbalanced bridge circuit to accomplish, and then cost and system complexity can show the reduction, and can save the inner space.
Drawings
Fig. 1 is a schematic circuit diagram of a double-path insulation resistance detection circuit suitable for a double-gun charger provided by the utility model;
the drawings are labeled as follows:
the circuit comprises a first switch-K1, a second switch-K2, a third switch-K3, a first relay-K4, a second relay-K5, a first resistor-R1, a second resistor-R2, a first differential amplifier-U1A and a second differential amplifier-U1B.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar modules or modules having the same or similar functionality throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application. On the contrary, the embodiments of the application include all changes, modifications and equivalents coming within the spirit and terms of the claims appended hereto.
Example 1
As shown in fig. 1, in the present embodiment, a dual-path insulation resistance detection circuit suitable for a dual-gun charger is specifically provided, and the detection circuit is suitable for a dual-gun charger and includes a first DC output and a second DC output of the dual-gun charger, where the first DC output includes a positive DC1+ and a negative DC1 ", and the second DC output includes a positive DC2+ and a negative DC 2-.
The insulation resistance detection circuit is composed of the switching circuit, the unbalanced bridge circuit and the differential sampling circuit, and the switching circuit, the unbalanced bridge circuit and the differential sampling circuit are arranged integrally or in a split mode so as to be integrated on a charger control board, and cost and internal space are saved; the battery charger can also be independently integrated into an integrated module, and is suitable for upgrading and transforming the old national standard charger.
The first direct current output and the second direct current output are respectively and independently connected into an unbalanced bridge circuit through a switching circuit, the switching circuit comprises a first relay K4 and a second relay K5, the positive pole DC1+ and the negative pole DC 1-of the first direct current output are respectively connected with the normally closed ends of the first relay K4 and the second relay K5, the positive pole DC2+ and the negative pole DC 2-of the second direct current output are respectively connected with the normally open ends of the first relay K4 and the second relay K5, and the common ends of the first relay K4 and the second relay K5 are respectively connected into the unbalanced bridge circuit. The first relay K4 and the second relay K5 are both single-pole double-throw relays, double-pole double-throw relays or two independent one-way switches.
Connecting the unbalanced bridge circuit with a differential sampling circuit, specifically as follows: the unbalanced bridge circuit comprises a first bridge and a second bridge, a common end of a first relay K4, common ends of the first bridge, the second bridge and a second relay K5 are sequentially connected in series, a common point of the first bridge and the second bridge is grounded through a third switch K3, and two ends of the first bridge and two ends of the second bridge are connected to the differential sampling circuit. The first bridge comprises a first resistor R1 and a first switch K1 which are connected in series, one end of the first resistor R1 is connected with the common end of the first relay K4, the other end of the first resistor R4 is connected with the first switch K1, and the first switch K1 is grounded through a third switch K3; the second bridge comprises a second resistor R2 and a second switch K2 which are connected in series, one end of the second resistor R2 is connected with the common end of the second relay K5, the other end of the second resistor R2 is connected with the second switch K2, and the second switch K2 is grounded through a third switch K3; the first switch K1, the second switch K2, and the third switch K3 are connected to the same common point.
The insulation resistance values of the positive pole to the ground and the negative pole to the ground of the first direct current output and the second direct current output which need to be calculated can be regarded as the resistance values of a virtual insulation resistor R + and an insulation resistor R-which are respectively connected in parallel on the first bridge and the second bridge, the voltage VH and the voltage VL at two ends of the insulation resistor R + and the insulation resistor R-are respectively measured, and the insulation resistance values of the positive pole and the negative pole of the first direct current output or the second direct current output to the ground are calculated by the voltage VH and the voltage VL through a differential sampling circuit. The differential sampling circuit comprises a first differential amplifier U1A, a second differential amplifier U1B and a single chip microcomputer, wherein the differential amplifier receives two voltages as input and provides an amplified difference as output. The output ends of the first differential amplifier U1A and the second differential amplifier U1B are both connected with the single chip microcomputer, two ends of the input end of the first differential amplifier U1A are respectively connected with two ends of a first bridge, and two ends of the input end of the second differential amplifier U1B are respectively connected with two ends of a second bridge; the singlechip is integrated with an A/D conversion channel, the A/D conversion channel obtains the voltage values of the voltage VH and the voltage VL, and the singlechip can be replaced by an independent A/D conversion chip. Specifically, the positive electrode of the first differential amplifier U1A is connected to the common terminal of the first relay K4, and the negative electrode of the first differential amplifier U1A is connected to the common point; the positive electrode of the second differential amplifier U1B is connected to the common point, and the negative electrode of the second differential amplifier U1B is connected to the common terminal of the second relay K5.
In order to realize that the detection circuit can carry out automatic detection, the control ends of the first relay K4, the second relay K5, the first switch K1, the second switch K2 and the third switch K3 are all in communication connection with the single chip microcomputer so as to switch the on-off of the first relay K4, the second relay K5, the first switch K1, the second switch K2 and the third switch K3 through the single chip microcomputer.
In order to realize real-time transmission of the measurement result of the detection circuit, the single chip microcomputer is in communication connection with an upper computer through a communication interface so as to conveniently control the measurement result in real time.
The working principle of the double-circuit insulation resistance detection circuit suitable for the double-gun charger provided by the embodiment is as follows:
when the charger needs to perform insulation detection on the whole loop of the first direct current output, the first relay K4 and the second relay K5 are switched to a normally closed end, and the positive pole DC1+ and the negative pole DC 1-of the first direct current output are connected to an unbalanced bridge circuit; then the second switch K2 is opened, the first switch K1 and the third switch K3 are closed, and voltages VH1 and VL1 at two ends of the first resistor R1 and the second resistor R2 are measured through a differential sampling circuit; then the first switch K1 is opened, the second switch K2 and the third switch K3 are closed, the voltages VH2 and VL2 at the two ends of the first resistor R1 and the second resistor R2 are measured, and finally under the condition that the resistance values of the first resistor R1 and the second resistor R2 are known, the insulation resistance values R1+ and R1-of the positive electrode and the negative electrode of the first direct current output are calculated through the single chip microcomputer.
When the charger needs to perform insulation detection on another gun (namely, the second direct current output), the first relay K4 and the second relay K5 are switched to the normally open end, and the anode DC2+ and the cathode DC 2-of the second direct current output are connected to the unbalanced bridge circuit; the same method can then be used to calculate the insulation resistances R2+ and R2-of the positive and negative poles of the second dc output to ground.
In the process, the on-off switching of the first relay K4, the second relay K5, the first switch K1, the second switch K2 and the third switch K3 is controlled by a single chip microcomputer, and logic language required by programming in the single chip microcomputer belongs to common knowledge of technicians in the field.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present application, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present application includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (9)
1. The double-path insulation resistance detection circuit suitable for the double-gun charger is characterized by comprising a first direct current output and a second direct current output of the charger, a switching circuit, an unbalanced bridge circuit and a differential sampling circuit, wherein the first direct current output and the second direct current output are respectively and independently connected into the unbalanced bridge circuit through the switching circuit, the unbalanced bridge circuit is connected with the differential sampling circuit, and the insulation resistance values of the positive pole and the negative pole of the first direct current output or the second direct current output to the ground are calculated through the differential sampling circuit.
2. The double-circuit insulation resistance detection circuit suitable for the double-gun charger according to claim 1, wherein the switching circuit comprises a first relay and a second relay, the positive pole and the negative pole of the first direct current output are respectively connected with the normally closed ends of the first relay and the second relay, the positive pole and the negative pole of the second direct current output are respectively connected with the normally open ends of the first relay and the second relay, and the common ends of the first relay and the second relay are respectively connected to the unbalanced bridge circuit.
3. The double-path insulation resistance detection circuit suitable for the double-gun charger according to claim 2, wherein the first relay and the second relay are both single-pole double-throw relays.
4. The double-circuit insulation resistance detection circuit suitable for the double-gun charger according to claim 2, wherein the unbalanced bridge circuit comprises a first bridge and a second bridge, a common end of the first relay, a common end of the first bridge, a common end of the second bridge and a common end of the second relay are sequentially connected in series, a connection common point of the first bridge and the second bridge is grounded through a third switch, and two ends of the first bridge and two ends of the second bridge are both connected to the differential sampling circuit.
5. The double-circuit insulation resistance detection circuit suitable for the double-gun charger according to claim 4, wherein the first bridge comprises a first resistor and a first switch which are connected in series, and the second bridge comprises a second resistor and a second switch which are connected in series.
6. The double-circuit insulation resistance detection circuit suitable for the double-gun charger according to claim 5, wherein the differential sampling circuit comprises a first differential amplifier, a second differential amplifier and a single chip microcomputer, output ends of the first differential amplifier and the second differential amplifier are connected with the single chip microcomputer, two ends of an input end of the first differential amplifier are respectively connected with two ends of a first bridge, and two ends of an input end of the second differential amplifier are respectively connected with two ends of a second bridge.
7. The double-circuit insulation resistance detection circuit suitable for the double-gun charger according to claim 6, wherein control ends of the first relay, the second relay, the first switch, the second switch and the third switch are all in communication connection with the single chip microcomputer.
8. The double-circuit insulation resistance detection circuit suitable for the double-gun charger according to claim 1, wherein the switching circuit, the unbalanced bridge circuit and the differential sampling circuit are arranged as a whole or in a split manner.
9. The double-circuit insulation resistance detection circuit suitable for the double-gun charger according to claim 6, wherein the single chip microcomputer is in communication connection with an upper computer through a communication interface.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921982207.8U CN211402542U (en) | 2019-11-15 | 2019-11-15 | Be applicable to rush-harvesting and rush-planting machine double-circuit insulation resistance detection circuitry that charges |
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| CN201921982207.8U CN211402542U (en) | 2019-11-15 | 2019-11-15 | Be applicable to rush-harvesting and rush-planting machine double-circuit insulation resistance detection circuitry that charges |
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| CN211402542U true CN211402542U (en) | 2020-09-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115009060A (en) * | 2022-06-30 | 2022-09-06 | 珠海英搏尔电气股份有限公司 | Insulation detection circuit, detection method and vehicle-mounted charger |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115009060A (en) * | 2022-06-30 | 2022-09-06 | 珠海英搏尔电气股份有限公司 | Insulation detection circuit, detection method and vehicle-mounted charger |
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