CN110470876B - High-voltage isolation detection circuit and detection method of midpoint grounding high-voltage system - Google Patents
High-voltage isolation detection circuit and detection method of midpoint grounding high-voltage system Download PDFInfo
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- CN110470876B CN110470876B CN201910887055.1A CN201910887055A CN110470876B CN 110470876 B CN110470876 B CN 110470876B CN 201910887055 A CN201910887055 A CN 201910887055A CN 110470876 B CN110470876 B CN 110470876B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
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Abstract
The invention discloses a high-voltage isolation detection circuit and a detection method of a midpoint grounding high-voltage system, wherein the circuit comprises a voltage sensor, a first divider resistor module and a second divider resistor module, one end of the first divider resistor module is connected with a primary side input anode of the voltage sensor, the other end of the first divider resistor module is connected with a high-voltage system output anode, one end of the second divider resistor module is connected with a primary side input cathode of the voltage sensor, the other end of the second divider resistor module is connected with a high-voltage system output cathode, the first divider resistor module and the second divider resistor module are the same and are symmetrically arranged on a current-limiting divider circuit branch. The invention adopts the standard specification divider resistor to be matched with the voltage sensor to complete the voltage detection of the 6kV high-voltage power supply system with the grounded middle point, and can reduce the volume and the cost of a detection device.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a high-voltage isolation detection circuit and a detection method for a midpoint grounding high-voltage system.
Background
For the output voltage detection of a dipolar iron power supply and a quadrapole iron power supply, the peak value of the output voltage is 6kV during normal work, and according to the first part of GB4943.1-2011 information technology equipment safety: general requirements the isolation voltage sensors used in the existing voltage detection circuits need at least 7.5kV on the primary and secondary sides, and also need a matching transformer, and the isolation voltage sensors of 7.5kV and above 7.5kV are large in size, high in price, and relatively centralized in installation space requirements.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention provides a high-voltage isolation detection circuit and a detection method for a midpoint grounding high-voltage system.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a high-voltage isolation detection circuit of a midpoint grounding high-voltage system, which comprises: the voltage sensor, the first divider resistor module and the second divider resistor module;
one end of the first divider resistor module is connected with a primary side input anode of the voltage sensor, the other end of the first divider resistor module is connected with a high-voltage system output anode, one end of the second divider resistor module is connected with a primary side input cathode of the voltage sensor, the other end of the second divider resistor module is connected with a high-voltage system output cathode, the first divider resistor module and the second divider resistor module are the same and are symmetrically arranged on a current-limiting divider circuit branch circuit.
As a preferred technical solution, the first voltage-dividing resistor module is provided with a first resistor, a second resistor, a third resistor, a fourth resistor and a fifth resistor, and the resistors arranged in the first voltage-dividing resistor module are all connected in series; the second voltage-dividing resistor module is provided with a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor and a tenth resistor, and the resistors arranged in the second voltage-dividing resistor module are all connected in series.
As a preferred technical scheme, the first voltage-dividing resistor module is provided with a first voltage-dividing resistor series branch, a second voltage-dividing resistor series branch and a third voltage-dividing resistor series branch, one end of the first voltage-dividing resistor series branch is connected with an output positive electrode of a high-voltage system, the other end of the first voltage-dividing resistor series branch is connected with one end of the second voltage-dividing resistor series branch in series, the other end of the second voltage-dividing resistor series branch is connected with a primary side input positive electrode of a voltage sensor, a connection position of the first voltage-dividing resistor series branch and the second voltage-dividing resistor series branch is connected with one end of the third voltage-dividing resistor series branch, and the other end of the third voltage-dividing resistor series branch is grounded;
the second voltage-dividing resistor module is provided with a fourth voltage-dividing resistor serial branch, a fifth voltage-dividing resistor serial branch and a sixth voltage-dividing resistor serial branch, one end of the fourth voltage-dividing resistor serial branch is connected with the output negative electrode of the high-voltage system, the other end of the fourth voltage-dividing resistor serial branch is connected with one end of the fifth voltage-dividing resistor serial branch in series, the other end of the fifth voltage-dividing resistor serial branch is connected with the primary input negative electrode of the voltage sensor, the joint of the fourth voltage-dividing resistor serial branch and the fifth voltage-dividing resistor serial branch is connected with one end of the sixth voltage-dividing resistor serial branch, and the other end of the sixth voltage-dividing resistor serial branch is grounded.
As a preferred technical solution, the first voltage-dividing resistor series branch is provided with a first resistor, a second resistor, a third resistor and a fourth resistor, the second voltage-dividing resistor series branch is provided with a fifth resistor and a sixth resistor, the third voltage-dividing resistor series branch is provided with a thirteenth resistor and a fourteenth resistor, one end of the first resistor is connected with the output positive electrode of the high-voltage system, the first resistor, the second resistor, the third resistor, the fourth resistor, the fifth resistor and the sixth resistor are all connected in series, one end of the sixth resistor is connected with the primary-side input positive electrode of the voltage sensor, the connection between the fourth resistor and the fifth resistor is connected with one end of the thirteenth resistor, the other end of the thirteenth resistor is connected with one end of the fourteenth resistor, and the other end of the fourteenth resistor is grounded;
the fourth voltage-dividing resistor series branch is provided with a ninth resistor, a tenth resistor, an eleventh resistor and a twelfth resistor, the fifth voltage-dividing resistor series branch is provided with a seventh resistor and an eighth resistor, the sixth voltage-dividing resistor series branch is provided with a fifteenth resistor and a sixteenth resistor, one end of the seventh resistor is connected with the primary input negative electrode of the voltage sensor, the seventh resistor, the eighth resistor, the ninth resistor, the tenth resistor, the eleventh resistor and the twelfth resistor are all connected in series, one end of the twelfth resistor is connected with the output negative electrode of the high-voltage system, the junction of the eighth resistor and the ninth resistor is connected with one end of the sixteenth resistor, the other end of the sixteenth resistor is connected with one end of the fifteenth resistor, and the other end of the fifteenth resistor is grounded.
Preferably, the resistor is a high-voltage glass glaze resistor.
As a preferable technical scheme, the secondary side of the voltage sensor adopts +/-15V power supply, and the voltage sensor is provided with a current signal output port in proportion to output voltage.
As a preferable technical scheme, the voltage sensor adopts a voltage sensor with the isolation voltage of 6 kV.
As a preferred technical scheme, the high-voltage system power supply is further provided with a first capacitor and a second capacitor, wherein the positive electrode of the first capacitor is connected with the positive electrode of the output of the high-voltage system, the negative electrode of the first capacitor is grounded and is connected with the positive electrode of the second capacitor, and the negative electrode of the second capacitor is connected with the negative electrode of the output of the high-voltage system.
The invention provides a detection method of a high-voltage isolation detection circuit of a midpoint grounding high-voltage system, which comprises the following steps:
the output voltage of the power supply is converted into a current signal through the first voltage-dividing resistor module, the voltage sensor and the second voltage-dividing resistor module;
the primary voltage and the secondary current of the voltage sensor are calculated according to the following relation:
wherein u isoIs an effective value of the output voltage in V, ioIs the current signal output by the voltage sensor and has the unit of A, roIs a first voltage dividing resistor module, a second voltage dividing resistor moduleAnd the resistance values of all resistors in the voltage-dividing resistor module.
The invention provides a detection method of a high-voltage isolation detection circuit of a midpoint grounding high-voltage system, which comprises the following steps:
the output voltage of the power supply passes through a resistance current-limiting network consisting of a first voltage-dividing resistance module and a second voltage-dividing resistance module, a voltage signal is converted into a current signal, and the current signal is isolated, amplified and output through a voltage sensor;
neglecting the primary internal resistance of the voltage sensor, the calculation relation of the primary voltage and the secondary current signal of the voltage sensor is as follows:
wherein u isoIs an effective value of the output voltage in V, ioIs the current signal output by the voltage sensor and has the unit of A, roThe resistance values of the resistors in the first voltage-dividing resistor module and the second voltage-dividing resistor module are obtained.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) according to the invention, by utilizing the characteristic that the midpoint of the power output is grounded, the isolation detection of the peak value 6kV high voltage is realized by adopting the standard specification isolation voltage AC6kV voltage sensor, and the voltage sensor of AC7500V isolation voltage is not needed, so that the cost and the volume are effectively saved.
(2) The high-voltage isolation detection is realized by adopting the series-parallel connection of the discrete standard specification high-voltage resistors and the matching of the standard specification voltage sensor, so that the space and the cost are saved.
Drawings
Fig. 1 is a schematic structural diagram of a high-voltage isolation detection circuit of a midpoint grounded high-voltage system in this embodiment 1;
fig. 2 is a schematic structural diagram of a high-voltage isolation detection circuit of the midpoint grounded high-voltage system in this embodiment 2.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
As shown in fig. 1, the present embodiment provides a high voltage isolation detection circuit of a midpoint grounded high voltage system, which comprises a voltage sensor and a plurality of voltage dividing resistors, wherein the plurality of voltage dividing resistors are connected in series at two ends of an output voltage, the voltage sensor is connected in series at a midpoint grounded position with positive and negative symmetry,
the high-voltage isolation detection circuit of the embodiment specifically comprises: the voltage sensor, the first divider resistor module and the second divider resistor module; one end of the first divider resistor module is connected with a primary side input anode of the voltage sensor, the other end of the first divider resistor module is connected with a high-voltage system output anode, one end of the second divider resistor module is connected with a primary side input cathode of the voltage sensor, the other end of the second divider resistor module is connected with a high-voltage system output cathode, and the first divider resistor module and the second divider resistor module are the same and are symmetrically arranged on a current-limiting voltage-dividing circuit branch.
In this embodiment, the first voltage-dividing resistor module is provided with a first resistor, a second resistor, a third resistor, a fourth resistor and a fifth resistor, and the resistors arranged in the first voltage-dividing resistor module are all connected in series; the second voltage-dividing resistor module is provided with a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor and a tenth resistor, and the resistors arranged in the second voltage-dividing resistor module are all connected in series.
In the embodiment, the rated current of the primary side current of the voltage sensor is 10mA, the maximum current is 20mA, the peak value of the output voltage of the detected power supply is 6kV, and it can be calculated that 10 resistors of 39k Ω are connected in series, the power of each resistor is 4.6W, the rated power of each resistor is at least 25W in consideration of the self-cooling and heat dissipation factors of the resistors, and in the embodiment, the divider resistor is a high-voltage glass glaze resistor.
In the embodiment, the characteristics of the midpoint grounding of the high-voltage power supply output filter capacitor are utilized, resistors are connected in series, a voltage sensor is connected in series at the position where the midpoint of positive and negative symmetry is close to the ground potential, the high-voltage glass glaze resistor is selected for voltage division and current limitation, and the voltage sensor with the isolation voltage of 4.7kV or more is matched to meet the voltage detection and safety requirements under the normal working condition.
The present embodiment considers the type selection of the voltage sensor: consider the primary current range of the voltage sensor and the voltage of the primary side of the voltage sensor at points C and D relative to ground under abnormal operating conditions.
During normal operation, points C and D in the figure 1 are respectively connected with a plus end and a minus end of a primary side of the voltage sensor, a secondary side of the voltage sensor adopts +/-15V power supply, and DC500V between the power supply and the ground is withstand voltage and can be regarded as being close to the potential of the ground.
The voltage detection branch is abnormally connected but the power supply is in a normal working state, for example, the primary side series current-limiting resistance branch of the voltage sensor is abnormally disconnected, the voltage of the potential at the points C and D to the ground is clamped to be 3kV due to the voltage division effect of the capacitors C1 and C2, and under the condition, according to the first part of GB4943.1-2011 information technology equipment safety from the aspect of safety regulations: general requirements the isolation voltage requirements of the primary and secondary sides of the voltage sensor are at least AC 4.7 kV.
The abnormal working state and the abnormal connection condition occur simultaneously, for example, when a primary side series current-limiting resistance branch of a voltage sensor is abnormally disconnected and a resonant load is detuned to cause overvoltage of a power port, the voltage peak value exceeds 6kV, the voltage of the potential of a point C and a point D to the ground is half of the abnormal peak voltage of the port, and the condition is the first part of safety of the equipment according to GB4943.1-2011 information technology from the aspect of safety regulation: the general requirements require that the isolation voltage of the voltage sensor must be reserved at least 1.2 times of the margin on the basis of 4.7 kV.
In conclusion, the voltage sensor of the embodiment is selected from the voltage sensor with the model of LV100 and the brand of LEM, has the isolation voltage of 6kV, is moderate in price, small in size and light in weight, and meets the detection requirement and the safety regulation requirement.
As shown in the detection circuit of FIG. 1, the output voltage of the power supply passes through R1-R5, the voltage sensor and the branches R6-R10 convert the voltage signal into a current signal, and the voltage sensor amplifies the primary current. The current ratio of the primary side to the secondary side is 10: 25;
the relationship derived from the ohm law of the primary voltage and the secondary current of the voltage sensor is as follows:
wherein u isoIs an effective value of the output voltage in V, ioThe unit is a current signal output by the voltage sensor.
Calculating the highest detectable peak voltage 7.8kV of the detection circuit reversely according to the formula (1) and the primary side current peak value of the voltage sensor of 20 mA; from the safety regulation perspective, the first part of the safety of GB4943.1-2011 information technology equipment is as follows: general requirements the highest peak voltage allowed by the voltage sensor 6kV isolation voltage reverse lookup power port is 8.8 kV. In conclusion, under the condition of simultaneously meeting the device range and safety specification, the maximum peak voltage allowed by the power port is 7.8kV, and compared with the nominal maximum voltage of the equipment, 6kV, the maximum peak voltage has 1.3 times of voltage detection margin. The feasible precondition of the design scheme is that the voltage of the power port does not exceed 7.8kV, and the abnormal high voltage condition of more than 7.8kV of the power port caused by the detuning of the resonant load of the power supply can not occur. Considering that the voltage withstanding of the capacitors of the power supply ports C1 and C2 are both AC 3kV, the allowable peak value of the voltage of the power supply port under voltage equalizing condition is 8484V. If 1.1 times the over-voltage capability of the capacitor is considered, the short-time maximum port voltage allowed by the power port capacitor is 9332.4V. In order to eliminate the short board with a lower detection range of the port voltage detection circuit, the embodiment 2 is optimally designed in consideration of detection margins under safety regulations and abnormal working conditions.
Example 2:
the technical scheme of the embodiment 2 is the same as that of the embodiment 1 except for the following technical features:
in order to ensure that the power supply system can still normally operate in an abnormal operating state (for example, the resonance load detunes to cause a high voltage at the power supply port, and the voltage is greater than 7.8kV), as shown in fig. 2, in this embodiment, a high-voltage isolation detection circuit of a midpoint grounded high-voltage system is provided, and the allowable voltage at the power supply port is increased to more than 7.8kV without increasing the number of current-limiting resistors.
In this embodiment, the first voltage-dividing resistor module is provided with a first voltage-dividing resistor serial branch, a second voltage-dividing resistor serial branch and a third voltage-dividing resistor serial branch, one end of the first voltage-dividing resistor serial branch is connected with the output positive electrode of the high-voltage system, the other end of the first voltage-dividing resistor serial branch is connected with one end of the second voltage-dividing resistor serial branch in series, the other end of the second voltage-dividing resistor serial branch is connected with the primary side input positive electrode of the voltage sensor, the connection position of the first voltage-dividing resistor serial branch and the second voltage-dividing resistor serial branch is connected with one end of the third voltage-dividing resistor serial branch, and the other end of the third voltage-dividing resistor serial branch is grounded;
in this embodiment, the second voltage-dividing resistor module is provided with a fourth voltage-dividing resistor serial branch, a fifth voltage-dividing resistor serial branch and a sixth voltage-dividing resistor serial branch, one end of the fourth voltage-dividing resistor serial branch is connected with the output negative electrode of the high-voltage system, the other end of the fourth voltage-dividing resistor serial branch is connected with one end of the fifth voltage-dividing resistor serial branch in series, the other end of the fifth voltage-dividing resistor serial branch is connected with the primary side input negative electrode of the voltage sensor, the junction of the fourth voltage-dividing resistor serial branch and the fifth voltage-dividing resistor serial branch is connected with one end of the sixth voltage-dividing resistor serial branch, and the other end of the sixth voltage-dividing resistor serial branch is grounded.
In this embodiment, the first voltage-dividing resistor series branch is provided with a first resistor, a second resistor, a third resistor and a fourth resistor, the second voltage-dividing resistor series branch is provided with a fifth resistor and a sixth resistor, the third voltage-dividing resistor series branch is provided with a thirteenth resistor and a fourteenth resistor, one end of the first resistor is connected with the output anode of the high-voltage system, the first resistor, the second resistor, the third resistor, the fourth resistor, the fifth resistor and the sixth resistor are all connected in series, one end of the sixth resistor is connected with the input anode of the voltage sensor, the connection part of the fourth resistor and the fifth resistor is connected with one end of the thirteenth resistor, the other end of the thirteenth resistor is connected with one end of the fourteenth resistor, and the other end of the fourteenth resistor is grounded;
in this embodiment, the fourth voltage-dividing resistor series branch is provided with a ninth resistor, a tenth resistor, an eleventh resistor and a twelfth resistor, the fifth voltage-dividing resistor series branch is provided with a seventh resistor and an eighth resistor, the sixth voltage-dividing resistor series branch is provided with a fifteenth resistor and a sixteenth resistor, one end of the seventh resistor is connected to the primary input cathode of the voltage sensor, the seventh resistor, the eighth resistor, the ninth resistor, the tenth resistor, the eleventh resistor and the twelfth resistor are all connected in series, one end of the twelfth resistor is connected to the output cathode of the high-voltage system, a junction of the eighth resistor and the ninth resistor is connected to one end of the sixteenth resistor, the other end of the sixteenth resistor is connected to one end of the fifteenth resistor, and the other end of the fifteenth resistor is grounded.
The selection of the voltage dividing and current limiting resistors in this embodiment is: the total number of the sampling resistor units is 16 according to the parameters, the sampling resistor units bear the highest working voltage of 600V, the high-voltage glass glaze film resistors are selected, the resistor number of the embodiment is a result of comprehensively considering factors such as electrical parameters, voltage resistance and dissipation power of the resistor units, space limitation in specific equipment and the like, and other resistor numbers and unit specification configurations can achieve the effect.
In this embodiment, the primary and secondary current transformation ratios of the LV100 voltage sensor are: 10:25. When the primary side high voltage peak value of the voltage sensor is 6kV in normal work, as shown in figure 2, the voltage is divided and limited through the series resistance network, the primary side peak current of the voltage sensor is 7.7mA, and the secondary side peak current of the voltage sensor is 19.2 mA. The output voltage of the power supply passes through a resistance current-limiting network consisting of a first voltage-dividing resistance module and a second voltage-dividing resistance module, a voltage signal is converted into a current signal, and the current signal is isolated, amplified and output through a voltage sensor;
the primary resistance of the voltage sensor is ignored, meanwhile, a fifth resistor and a sixth resistor in the second divider resistor series branch are connected in series and then connected in parallel with a thirteenth resistor and a fourteenth resistor in the third divider resistor series branch, the equivalent resistance value of the total branch is a single resistor resistance value, a seventh resistor and an eighth resistor in the fifth divider resistor series branch are connected in series and then connected in parallel with a fifteenth resistor and a sixteenth resistor in the sixth divider resistor series branch, and the equivalent resistance value of the total branch is a single resistor resistance value, so that the resistance current-limiting equivalent network is still formed by connecting 10 resistors in series. However, because of the existence of the series branch, the primary side current of the voltage sensor becomes 1/2, so the relationship derived from the primary side voltage and the secondary side current of the voltage sensor according to ohm's law is as follows:
wherein u isoIs an effective value of the output voltage in V, ioIs a current signal proportional to the output voltage, in units of a, output by the voltage sensor. Calculating the maximum detectable peak voltage 15.6kV of the detection circuit reversely according to the formula (2) and the consideration of the range of the rated current peak value 20mA of the primary side of the voltage sensor; according to the first part of GB4943.1-2011 information technology equipment safety: general requirements the reverse search with the 6kV isolation voltage of the voltage sensor is considered from the safety regulation point of view, and the maximum peak voltage allowed by the power port is 8.8 kV. In conclusion, under the condition of simultaneously meeting the device range and safety specification, the maximum peak voltage allowed by the power port is 8.8kV, and compared with the nominal output peak voltage of 6kV of the equipment, the maximum peak voltage is 1.4-1.5 times of the voltage detection margin. Compared with embodiment 1, the voltage sensor isolation voltage is unchanged, and the current of the current-limiting resistor branch circuit is adjusted to improve the overvoltage detection range of the whole circuit.
The point B in fig. 2 is connected to the ground, and the resistors of the first voltage dividing resistor series branch and the third voltage dividing resistor series branch are used as voltage-sharing resistors of a power port capacitor C1, and the resistors of the fourth voltage dividing resistor series branch and the sixth voltage dividing resistor series branch are used as voltage-sharing resistors of a power port capacitor C2, wherein the positive pole of the power output is connected in parallel with a capacitor C1 through a network in which resistors R1, R2, R3, R4, R13, R14 and the point B are connected to the ground. The negative pole of the power supply output is connected with the capacitor C2 in parallel through a network of resistors R12, R11, R10, R9, R16, R15 and B point which are connected with the ground. The increase of the voltage-sharing resistance is beneficial to the dynamic voltage sharing of the two groups of capacitors, in particular to the transient peak high voltage after the load is detuned.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (6)
1. A high voltage isolation detection circuit for a midpoint grounded high voltage system, comprising: the voltage sensor, the first divider resistor module and the second divider resistor module;
one end of the first divider resistor module is connected with a primary side input anode of the voltage sensor, the other end of the first divider resistor module is connected with a high-voltage system output anode, one end of the second divider resistor module is connected with a primary side input cathode of the voltage sensor, the other end of the second divider resistor module is connected with a high-voltage system output cathode, the first divider resistor module and the second divider resistor module are the same and are symmetrically arranged on a current-limiting and voltage-dividing circuit branch circuit;
the first divider resistor module is provided with a first divider resistor serial branch, a second divider resistor serial branch and a third divider resistor serial branch, one end of the first divider resistor serial branch is connected with the output positive electrode of the high-voltage system, the other end of the first divider resistor serial branch is connected with one end of the second divider resistor serial branch in series, the other end of the second divider resistor serial branch is connected with the primary side input positive electrode of the voltage sensor, the joint of the first divider resistor serial branch and the second divider resistor serial branch is connected with one end of the third divider resistor serial branch, and the other end of the third divider resistor serial branch is grounded;
the second voltage-dividing resistor module is provided with a fourth voltage-dividing resistor series branch, a fifth voltage-dividing resistor series branch and a sixth voltage-dividing resistor series branch, one end of the fourth voltage-dividing resistor series branch is connected with the output negative electrode of the high-voltage system, the other end of the fourth voltage-dividing resistor series branch is connected with one end of the fifth voltage-dividing resistor series branch in series, the other end of the fifth voltage-dividing resistor series branch is connected with the primary input negative electrode of the voltage sensor, the connection position of the fourth voltage-dividing resistor series branch and the fifth voltage-dividing resistor series branch is connected with one end of the sixth voltage-dividing resistor series branch, and the other end of the sixth voltage-dividing resistor series branch is grounded;
the high-voltage system is characterized by further comprising a first capacitor and a second capacitor, wherein the positive electrode of the first capacitor is connected with the positive electrode of the output of the high-voltage system, the negative electrode of the first capacitor is grounded and is connected with the positive electrode of the second capacitor, and the negative electrode of the second capacitor is connected with the negative electrode of the output of the high-voltage system.
2. The high voltage isolation detection circuit of a midpoint grounded high voltage system of claim 1, the first voltage dividing resistor series branch is provided with a first resistor, a second resistor, a third resistor and a fourth resistor, the second voltage-dividing resistor series branch is provided with a fifth resistor and a sixth resistor, the third voltage-dividing resistor series branch is provided with a thirteenth resistor and a fourteenth resistor, one end of the first resistor is connected with the output anode of the high-voltage system, the first resistor, the second resistor, the third resistor, the fourth resistor, the fifth resistor and the sixth resistor are all connected in series, one end of the sixth resistor is connected with the primary side input positive electrode of the voltage sensor, the joint of the fourth resistor and the fifth resistor is connected with one end of the thirteenth resistor, the other end of the thirteenth resistor is connected with one end of a fourteenth resistor, and the other end of the fourteenth resistor is grounded;
the fourth voltage-dividing resistor series branch is provided with a ninth resistor, a tenth resistor, an eleventh resistor and a twelfth resistor, the fifth voltage-dividing resistor series branch is provided with a seventh resistor and an eighth resistor, the sixth voltage-dividing resistor series branch is provided with a fifteenth resistor and a sixteenth resistor, one end of the seventh resistor is connected with the primary input negative electrode of the voltage sensor, the seventh resistor, the eighth resistor, the ninth resistor, the tenth resistor, the eleventh resistor and the twelfth resistor are all connected in series, one end of the twelfth resistor is connected with the output negative electrode of the high-voltage system, the junction of the eighth resistor and the ninth resistor is connected with one end of the sixteenth resistor, the other end of the sixteenth resistor is connected with one end of the fifteenth resistor, and the other end of the fifteenth resistor is grounded.
3. The high voltage isolation detection circuit of the midpoint grounded high voltage system according to claim 1 or 2, wherein the resistor is a high voltage glass glaze resistor.
4. The high voltage isolation detection circuit of a midpoint grounded high voltage system according to claim 1 or 2, wherein the secondary side of the voltage sensor is powered by ± 15V, and the voltage sensor is provided with a current signal output port proportional to the output voltage.
5. The high voltage isolation detection circuit of the midpoint grounded high voltage system according to claim 1 or 2, wherein the voltage sensor is a voltage sensor with an isolation voltage of 6 kV.
6. The method for detecting the high voltage isolation detection circuit of the midpoint grounded high voltage system according to claim 1 or 2, characterized by comprising the following steps:
the output voltage of the power supply passes through a resistance current-limiting network consisting of a first voltage-dividing resistance module and a second voltage-dividing resistance module, a voltage signal is converted into a current signal, and the current signal is isolated, amplified and output through a voltage sensor;
neglecting the primary internal resistance of the voltage sensor, the calculation relation of the primary voltage and the secondary current signal of the voltage sensor is as follows:
wherein u isoIs an effective value of the output voltage in V, ioIs the current signal output by the voltage sensor and has the unit of A, roThe resistance values of the resistors in the first voltage-dividing resistor module and the second voltage-dividing resistor module are obtained.
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