CN214097600U - Active isolation detection device for DC bus voltage of three-phase inverter - Google Patents
Active isolation detection device for DC bus voltage of three-phase inverter Download PDFInfo
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- CN214097600U CN214097600U CN202021956448.8U CN202021956448U CN214097600U CN 214097600 U CN214097600 U CN 214097600U CN 202021956448 U CN202021956448 U CN 202021956448U CN 214097600 U CN214097600 U CN 214097600U
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Abstract
The utility model discloses a three-phase inverter direct current bus voltage active isolation detection device, which comprises a resistance voltage division sampling circuit and a direct current bus voltage isolation circuit; the resistance voltage division sampling circuit comprises a voltage division resistance unit connected to the positive electrode and the negative electrode of the direct current bus and a differential operation circuit used for processing voltage signals output by the voltage division resistance unit; the direct current bus voltage isolation circuit is mainly used for isolating the output end of the resistance voltage division sampling circuit from a circuit connected with a later stage, preventing the interference of a high-voltage signal at the direct current bus end to be detected on the later stage circuit, and converting a voltage value output by the differential operation circuit into a voltage value matched with the later stage circuit through proportional operation. The interference can be prevented, and the detection precision is high.
Description
Technical Field
The utility model relates to a voltage detection circuit, in particular to active isolation detection device of three-phase inverter direct current bus voltage.
Background
The dc bus voltage is an important parameter that must be detected in time and that is safe when the output signal is reliably isolated from the dc bus.
The direct current bus voltage detection sampling is generally in a mode of sampling resistance voltage division, so that the processing is simple, interference signals are always introduced in the signal acquisition process, and the detection precision is low.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a three-phase inverter direct current bus voltage active isolation detection device is provided, can prevent to disturb, it is high to detect the precision.
The utility model provides a technical scheme that above-mentioned technical problem adopted does:
an active isolation detection device for DC bus voltage of a three-phase inverter comprises a resistance voltage division sampling circuit and a DC bus voltage isolation circuit; the resistance voltage division sampling circuit comprises a voltage division resistance unit connected to the positive electrode and the negative electrode of the direct current bus and a differential operation circuit used for processing voltage signals output by the voltage division resistance unit; the direct current bus voltage isolation circuit is mainly used for isolating the output end of the resistance voltage division sampling circuit from a circuit connected with a later stage, preventing the interference of a high-voltage signal at the direct current bus end to be detected on the later stage circuit, and converting a voltage value output by the differential operation circuit into a voltage value matched with the later stage circuit through proportional operation.
Preferably, the power supply isolation circuit is further included, and the power supply isolation circuit provides stable working voltage for the differential amplification circuit and the direct-current bus voltage isolation circuit.
Preferably, the resistance voltage division sampling circuit includes a resistance series branch and a first resistance, one end of the resistance series branch is connected to the positive electrode of the dc bus voltage, the other end of the resistance series branch is connected to one end of the first resistance, the other end of the first resistance is connected to the negative electrode of the dc bus voltage, and a node of the resistance series branch connected to the first resistance is connected to the input end of the differential operation circuit.
Preferably, the differential operational circuit includes a first operational amplifier, a same-direction input end of the first operational amplifier is connected to an output end of the resistance voltage division sampling circuit, an output end of the first operational amplifier is connected to an inverted input end of the first operational amplifier to form a negative feedback line, and an output end of the first operational amplifier is connected to an input end of the dc bus voltage isolation circuit.
Preferably, the dc bus voltage isolation circuit includes a second operational amplifier, a third operational amplifier and a linear optical coupler chip, an inverting input terminal of the second operational amplifier is connected to an output terminal of the resistance voltage division sampling circuit, the positive input end of the second operational amplifier is connected with the power isolation circuit, the output end of the second operational amplifier is connected with the No. 1 pin of the linear optocoupler chip, the reverse input end of the second operational amplifier is connected with the No. 3 pin of the linear optocoupler chip, the No. 2 pin and the No. 4 pin of the linear optocoupler chip are respectively connected with the power isolation circuit, no. 5 pin and No. 6 pin of the linear optical coupler chip are respectively connected with the forward input end and the reverse input end of the third operational amplifier, and No. 5 pin of the linear optical coupler chip is connected with the power isolation circuit.
Preferably, a first capacitor is connected in parallel between the output end and the inverting input end of the second operational amplifier and used for filtering high-frequency interference caused by the direct-current bus voltage.
Preferably, the output end of the third operational amplifier is connected with the inverting input end through a second resistor, and a second capacitor is connected in parallel to two ends of the second resistor and is used for filtering spikes and burrs of the output signal of the third operational amplifier.
Preferably, the power isolation circuit adopts a chip A2412XT-1WR 2.
Preferably, the voltage regulator further comprises a fourth operational amplifier for performing proportion adjustment on the signal output by the direct current bus voltage isolation circuit and converting the signal into a single output voltage signal matched with the voltage level of the subsequent circuit.
Preferably, an output end of the dc bus voltage isolation circuit is connected to a positive input end of a fourth operational amplifier, and an output end of the fourth operational amplifier is connected to a negative input end of the fourth operational amplifier to form a negative feedback line.
Compared with the prior art, the utility model discloses an active detection device that keeps apart of three-phase inverter direct current busbar voltage's advantage lies in, has adopted the active mode of keeping apart in order to keep apart busbar signal interference, and direct current busbar voltage's collection passes through resistance partial pressure mode, and the signal after the collection keeps apart through linear opto-coupler HCNR201, and the power part also carries out the power through chip A2412XT-1WR2 and keeps apart, then provides the chip in the circuit with the power after keeping apart and uses. The power supply system of the module adopts a 24V direct current power supply, the power supply is converted into a positive and negative 12V power supply through a chip A2412XT-1WR2 and is supplied to an operational amplifier and a linear optocoupler chip for use, and the isolated signals adopt the LM358 chip voltage of a fourth operational amplifier and then output standard 0-10V voltage signals.
Drawings
Fig. 1 is a schematic circuit diagram of an active isolation detection device for dc bus voltage of a three-phase inverter in this embodiment;
FIG. 2 is a circuit diagram of the power isolation circuit in the present embodiment;
fig. 3 is a schematic circuit diagram of the connection terminal JP1 in the present embodiment;
fig. 4 is a schematic circuit diagram of the connection terminal JP2 in this embodiment.
In the figure, 1, a resistance voltage division sampling circuit; 2. a DC bus voltage isolation circuit; 3. a power isolation circuit.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
An active isolation detection device for direct current bus voltage of a three-phase inverter is shown in figures 1-4 and comprises a resistance voltage division sampling circuit 1, a direct current bus voltage isolation circuit 2 and a power isolation circuit 3.
The resistance voltage division sampling circuit 1 comprises a voltage division resistance unit connected to the positive electrode and the negative electrode of the direct current bus and a differential operation circuit used for processing voltage signals output by the voltage division resistance unit, the direct current bus voltage isolation circuit 2 is mainly used for isolating the output end of the resistance voltage division sampling circuit 1 from a circuit connected with a rear stage, so that the interference of high-voltage signals at the end of the direct current bus to be detected on the rear stage circuit is prevented, and the voltage value output by the differential operation circuit is converted into a voltage value matched with the rear stage circuit through proportional operation.
The power isolation circuit 3 provides stable working voltage for the differential amplification circuit and the direct current bus voltage isolation circuit 2, and preferably, the power isolation circuit 3 adopts a chip A2412XT-1WR2 to convert 24V direct current voltage into a positive and negative 12V power supply.
The resistance voltage division sampling circuit 1 comprises a resistance series branch and a first resistor R10, wherein the voltage division resistor unit comprises a plurality of high-resistance high-voltage-resistance resistors R2, a resistor R3, a resistor R5, a resistor R6 and a resistor R7 which are sequentially connected in series, one end of a resistor R2 of the resistance series branch is connected with the positive pole of a direct-current bus voltage through a wiring terminal JP2, the resistor R7 of the other end is connected with one end of a first resistor R10, the other end of the first resistor R10 is connected with the negative pole of the direct-current bus voltage through a wiring terminal JP2, and a node of the resistance series branch connected with the first resistor R10 is connected with the input end of the differential operation circuit.
The differential operational circuit comprises a first operational amplifier U1A, wherein the same-direction input end of the first operational amplifier U1A is connected with the output end of the resistance voltage division sampling circuit 1, the output end of the first operational amplifier U1A is connected with the reverse input end of the first operational amplifier U1A to form a negative feedback circuit, and the output end of the first operational amplifier U1A is connected with the input end of the direct-current bus voltage isolation circuit 2.
The dc bus voltage isolation circuit 2 includes a second operational amplifier U1B, the circuit comprises a third operational amplifier U3A and a linear optical coupler chip U2, wherein the reverse input end of a second operational amplifier U1B is connected with the output end of a resistance voltage division sampling circuit 1 through a resistor R8, the forward input end of the second operational amplifier U1B is connected with a power isolation circuit 3, the output end of a second operational amplifier U1B is connected with a pin 1 of the linear optical coupler chip U2 through a resistor R9, the reverse input end of the second operational amplifier U1B is connected with a pin 3 of a linear optical coupler chip U2, a pin 2 and a pin 4 of the linear optical coupler chip U2 are respectively connected with the power isolation circuit 3, a pin 5 and a pin 6 of the linear optical coupler chip U2 are respectively connected with the forward input end and the reverse input end of the third operational amplifier U3A, and a pin 5 of the linear optical coupler chip U2 is connected with the power isolation circuit 3.
A first capacitor C1 is connected in parallel between the output end and the inverting input end of the second operational amplifier U1B, and is used for filtering high-frequency interference caused by the direct-current bus voltage.
The output end and the inverting input end of the third operational amplifier U3A are connected through a second resistor R4, and two ends of the second resistor R4 are connected in parallel with a second capacitor C2 for filtering peaks and burrs of an output signal of the third operational amplifier U3A.
The active isolation detection device for the direct-current bus voltage of the three-phase inverter further comprises a fourth operational amplifier U3B, wherein the fourth operational amplifier U3B is used for carrying out proportion adjustment on signals output by the direct-current bus voltage isolation circuit 2 and converting the signals into single output voltage signals matched with the voltage grade of a rear-stage circuit, and the specific value is 0-10V.
The output end of the direct current bus voltage isolation circuit 2 is connected to the positive input end of the fourth operational amplifier U3B, and the output end of the fourth operational amplifier U3B is connected with the negative input end of the fourth operational amplifier U3B to form a negative feedback line.
Specifically, the working voltages of the first operational amplifier U1A, the second operational amplifier U1B and the linear optocoupler chip U2 are all provided by an isolation power circuit and are connected through a connection terminal JP 1. The models of the first operational amplifier U1A, the second operational amplifier U1B, the third operational amplifier U3A and the fourth operational amplifier U3B are LM358, the model of the linear optical coupling chip U2 is HCNR201-500E, the model of the connecting terminal JP1 is KF128-5.08-3P, and the model of the connecting terminal JP2 is XH 2.54-6P.
Compared with the prior art, the utility model discloses an active detection device that keeps apart of three-phase inverter direct current busbar voltage's advantage lies in, has adopted the active mode of keeping apart in order to keep apart busbar signal interference, and direct current busbar voltage's collection passes through resistance partial pressure mode, and the signal after the collection keeps apart through linear opto-coupler chip U2, and the power part also carries out the power isolation through chip A2412XT-1WR2, then will keep apart the power and provide the chip in the circuit and use. A power supply system of the module adopts a 24V direct-current power supply, the power supply is converted into a positive power supply and a negative power supply of 12V through a chip A2412XT-1WR2 and is supplied to a first operational amplifier U1A, a second operational amplifier U1B and a linear optical coupling chip U2 for use, and an isolated signal is followed by the voltage of a fourth operational amplifier U3B and then a standard 0-10V voltage signal is output.
Although the preferred embodiments of the present invention have been described in detail hereinabove, it should be clearly understood that modifications and variations of the present invention are possible to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a three-phase inverter direct current busbar voltage active isolation detection device which characterized in that: the device comprises a resistance voltage division sampling circuit and a direct current bus voltage isolation circuit; the resistance voltage division sampling circuit comprises a voltage division resistance unit connected to the positive electrode and the negative electrode of the direct current bus and a differential operation circuit used for processing voltage signals output by the voltage division resistance unit; the direct current bus voltage isolation circuit is mainly used for isolating the output end of the resistance voltage division sampling circuit from a circuit connected with a later stage, preventing the interference of a high-voltage signal at the direct current bus end to be detected on the later stage circuit, and converting a voltage value output by the differential operation circuit into a voltage value matched with the later stage circuit through proportional operation.
2. The active isolation detection device of the three-phase inverter direct-current bus voltage according to claim 1, characterized in that: the power supply isolation circuit provides stable working voltage for the differential amplification circuit and the direct-current bus voltage isolation circuit.
3. The active isolation detection device of the three-phase inverter direct-current bus voltage according to claim 1, characterized in that: the resistance voltage division sampling circuit comprises a resistance series branch and a first resistor, one end of the resistance series branch is connected with the positive pole of the direct-current bus voltage, the other end of the resistance series branch is connected with one end of the first resistor, the other end of the first resistor is connected with the negative pole of the direct-current bus voltage, and the node of the resistance series branch connected with the first resistor is connected with the input end of the differential operation circuit.
4. The active isolation detection device of the three-phase inverter direct-current bus voltage according to claim 1, characterized in that: the differential operational circuit comprises a first operational amplifier, wherein the homodromous input end of the first operational amplifier is connected with the output end of the resistance voltage division sampling circuit, the output end of the first operational amplifier is connected with the reverse input end of the first operational amplifier to form a negative feedback circuit, and the output end of the first operational amplifier is connected with the input end of the direct current bus voltage isolation circuit.
5. The active isolation detection device of the three-phase inverter direct-current bus voltage according to claim 2, characterized in that: the direct current bus voltage isolation circuit comprises a second operational amplifier, a third operational amplifier and a linear optical coupler chip, wherein the reverse input end of the second operational amplifier is connected with the output end of the resistance voltage division sampling circuit, the positive input end of the second operational amplifier is connected with the power isolation circuit, the output end of the second operational amplifier is connected with the No. 1 pin of the linear optocoupler chip, the reverse input end of the second operational amplifier is connected with the No. 3 pin of the linear optocoupler chip, the No. 2 pin and the No. 4 pin of the linear optocoupler chip are respectively connected with the power isolation circuit, no. 5 pin and No. 6 pin of the linear optical coupler chip are respectively connected with the forward input end and the reverse input end of the third operational amplifier, and No. 5 pin of the linear optical coupler chip is connected with the power isolation circuit.
6. The active isolation detection device of the three-phase inverter direct-current bus voltage according to claim 5, characterized in that: and a first capacitor is connected in parallel between the output end and the reverse input end of the second operational amplifier and used for filtering high-frequency interference caused by the voltage of the direct-current bus.
7. The active isolation detection device of the three-phase inverter direct-current bus voltage according to claim 5, characterized in that: the output end of the third operational amplifier is connected with the reverse input end through a second resistor, and two ends of the second resistor are connected with a second capacitor in parallel and used for filtering peaks and burrs of an output signal of the third operational amplifier.
8. The active isolation detection device of the three-phase inverter direct-current bus voltage according to claim 2, characterized in that: the power isolation circuit adopts a chip A2412XT-1WR 2.
9. The active isolation detection device for the direct-current bus voltage of the three-phase inverter according to any one of claims 1 to 8, characterized in that: the fourth operational amplifier is used for carrying out proportion adjustment on the signals output by the direct current bus voltage isolation circuit and converting the signals into single output voltage signals matched with the voltage grade of the post-stage circuit.
10. The active isolation detection device of the three-phase inverter dc bus voltage according to claim 9, characterized in that: the output end of the direct current bus voltage isolation circuit is connected to the positive input end of a fourth operational amplifier, and the output end of the fourth operational amplifier is connected with the negative input end of the fourth operational amplifier to form a negative feedback circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021956448.8U CN214097600U (en) | 2020-09-09 | 2020-09-09 | Active isolation detection device for DC bus voltage of three-phase inverter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021956448.8U CN214097600U (en) | 2020-09-09 | 2020-09-09 | Active isolation detection device for DC bus voltage of three-phase inverter |
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| CN214097600U true CN214097600U (en) | 2021-08-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113899935A (en) * | 2021-09-23 | 2022-01-07 | 南京史利姆电子科技有限公司 | Novel isolation method of electric quantity sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113899935A (en) * | 2021-09-23 | 2022-01-07 | 南京史利姆电子科技有限公司 | Novel isolation method of electric quantity sensor |
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