TW201226928A - Insulation resistance measuring device of electric vehicle - Google Patents

Abstract

An insulation resistance measuring device of an electric vehicle comprises a measurement unit, a voltage detection unit and a control unit. The measurement unit comprises a first potential connector, a second potential connector, a switch element, and a measurement resistance. The first potential connector is used to connect to a highest potential end of a high voltage system; the second potential connector is used to connect to a ground end of a low voltage system; the switch element and the resistance are in series connection between the first and the second potential connectors. The voltage detection unit is used to detect the voltage formed between the first and the second potential connectors. The control unit can control the cut-off or conduction of the switch element and calculate a high potential insulation resistance and a low potential insulation resistance after the cut-off and conduction of the switch element.

Description

201226928 VI. Description of the Invention: [Technical Field] The present invention relates to a measuring device for an electric vehicle, and particularly relates to an insulating resistance measuring device for an electric vehicle. [Prior Art] As shown in FIG. 1, a general electric vehicle 9A usually includes a high voltage system 91 and a low voltage system 92. The high voltage system 9 is mainly used to drive a horse, 9U, and a high power source. % power supply 'The low voltage system = mainly to provide electricity for the electronic circuit of the low voltage operation, the ground terminal 921 of the low voltage system 92 is electrically connected with a body 93 of the electric vehicle to form a grounding system ( (4) Secret system), the high voltage system 91 will not be connected to the body 93. (4) The high power (four) system 9 will form an isolated state with the low voltage system 92. ▲ After the assembly of the electric vehicle 90 is completed, a most 7-position end 912 of the high voltage system 91 and the body 93 can be regarded as having a high potential insulation resistance Ra' and a minimum potential end 913 will be associated with the vehicle body Between % can be regarded as having a low-potential insulation resistance Rb, and the resistance value of the high-potential insulation resistance and the low-potential insulation resistance Rb is closely related to the safety of use, and if the resistance value is insufficient, it means that the electric leakage is easy. Operation with the low voltage system 92 can also be unstable and susceptible to damage. Therefore, in order to ensure the stability and security of the system operation, it must be done. The potential insulation resistance Ra and the low-level insulation resistance are measured. The US Pat. No. 7592815 discloses a leakage detection circuit for an electric vehicle. However, it can be seen from the third diagram of the patent that four resistors 21, 22 are required. 201226928 31, 3, 2, two switching elements u, 12, and a reverse stomach i3 can form a $ measurement unit, the patent has higher circuit complexity and manufacturing cost, and can calculate a total leakage The impedance R| cannot be obtained by the operation to obtain the high-potential insulation resistance Ra and the low-potential insulation resistance Rb, respectively. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an insulation resistance measuring device for an electric vehicle having low circuit complexity and low manufacturing cost. The electric vehicle includes a high electric system and a low electric grinder system, and the highest potential end of the high electric system can be regarded as having a high potential insulation resistance with respect to a ground end of the low voltage system. A lowest potential end of the high voltage system can be considered to have a low potential insulation resistance relative to the low ground (four) ground terminal. Therefore, the insulation resistance measuring device i of the electric vehicle of the present invention comprises a measuring unit, a voltage detecting unit, and a control unit. The first element includes a first lightning position connection, a second potential connection, a switching element, and a measuring resistance, the first potential connection is used for electrically connecting the high voltage system The highest potential end tapping potential joint is for electrically connecting the ground end of the low voltage system, and the resistor is connected in series between the first potential joint and the second potential joint. The voltage pre-measurement unit is configured to integrate the voltage formed between the first potential connector and the second potential connector. The control unit includes a control module, and the M.^L/diameter module controls the switch member to be turned off or turned on. The control module has a southernmost voltage value of the most potential end of the 5 mile. Measuring the resistance value of the resistor, a first function, and a 201226928 one-letter t 〇 _: when the switching element is turned off, the control module transmits the first potential joint and the second through the job 70 The gate of the potential connector has an early first value. When the switching element is turned on, the protection is detected by the voltage control module, and the second electrical value is detected between the first potential connector and the second potential connector. When the Tianhe control group obtains the first voltage value and the second voltage value, the control module can multiply the first resistance insulation resistance by using the measured resistance value, and use the measured resistance value to be fine— The second function ^ = potential insulation resistance, the first function and the second function are both the highest value 'the first - electric dust value, and the second voltage value as a function. The invention has the advantages that the manufacturing circuit is complicated because the circuit of the measuring unit is complicated. The switching element and the measuring resistor do not need other switching components, and the manufacturing cost is relatively low. In the use of the control simulation, the high-potential insulation resistance and the resistance of the it-H-edge resistance are respectively high, and the evaluation of the insulation effect of the manufacturer and the improvement of the leakage have high reference value, so it is helpful. In order to achieve a good and stable use effect of the electric vehicle. [Embodiment] A detailed description of a preferred embodiment of the present invention relating to the present invention and the following is a reference to the drawings. In the present invention, as shown in Figures 1 and 2, a preferred embodiment of the insulation resistance measuring device 201226928 200 of the electric vehicle of the present invention is applied to the electric vehicle _ 9G, and the electric vehicle 90 includes - The high voltage system 91' and the low voltage system 92; the highest potential terminal 912 of the high voltage system 91 is identifiable, and a ground terminal (GND) 921 of the low voltage system 92 can be formed. The electric potential insulation resistance Ra, a low potential end 913 of the high voltage system 91 can form a low potential insulation resistance electric 1 and Rb with respect to the grounding end 921 of the low voltage system 92, in this embodiment In the example, the grounding end 921 is electrically connected to the vehicle body % of the electric vehicle 9 . The insulating resistance measuring device 200 includes a Jin, a target, a _ _ 3 篁碉 early το 20, and a voltage detecting unit 30. And a control unit 4〇. The measuring unit 20 includes a first potential terminal 21, a second potential terminal 22, a switching element SW' and a measuring resistor rc. The first potential junction 21 is for electrically connecting the most south potential end 912 of the high voltage system 91. The second potential terminal 22 is used to electrically connect the grounding end 921 of the low voltage system. Since the grounding end 921 is electrically connected to the vehicle body in this embodiment, the second potential terminal 22 is actually measured. The body 93 can be directly contacted to form an electrical connection. The switching element SW and the resistor Rc are connected in series between the first potential terminal 21 and the second potential terminal 22. The voltage_unit 3G is used to detect the voltage formed between the first-f-bit connector 21 and the first potential terminal 22. In the present embodiment, the voltage detecting unit 30 employs an operational amplifier circuit. The control unit 40 and a storage module 43. The control module 41 can control the switching element sw to be turned off or turned on. The first mode, 'and 41 has the highest potential terminal 912 built therein - the highest voltage value VB , «Measure the resistance of the resistor Rc, - the first function, a second function, a female full value, and a second safety value. When the switching element sw is turned off, the control module 41 obtains a first voltage value va associated with the first potential junction 21 and the second potential junction 22 via the electric ground detecting unit 7G 3G.

When the switching element sw is turned on, the control module 41 obtains a second voltage value ν & between the _f-bit connector 21 and the second potential connector 22 via the dust detection early 7L 3G. . And the control module 41 obtains the first voltage value Va and the second voltage value a. The control module 4 i can multiply the measured resistance value by a first function to obtain the high potential insulation resistance Ra, and The low-level insulation resistance Rb is obtained by multiplying the value of the measurement resistor Rc by a first function, and the first function and the second function are both the highest voltage value %, the first voltage value, and the two voltage values Va' function. Λ, 2, 3, 4, the following describes the operation process of the high-potential insulation resistance and the low-potential insulation resistance Rb. When the switching element is mounted (as shown in FIG. 3), an arithmetic expression can be obtained. (1) is: slice... (1) When the switching element SW is turned on (as shown in Fig. 4), the equation (2) is:

K K Rb * Comprehensive calculation formulas (1), (2) can be obtained: 201226928

Ra= Rc Rb = Rc where the first function is 1+-1 + - -Vv: 1 + · Κ :Κ~να

(κ-κ) 1 ^ J 1 κ' J -κ κ ' The second function is that since the voltage value ν 该 of the highest potential terminal 912 is known in designing the motor 911, the measuring resistor The resistance value of Rc is known, and the first voltage i Va and the second voltage i% can be measured by the voltage detecting unit 30, so the control module 41 can smoothly calculate the high-potential insulation resistance Ra. And the low potential insulation resistance Rb. When used, the high-potential insulation resistance Ra and the low-potential insulation resistance

The Rb can be recorded in the storage module 43. When the high-potential insulation resistance is lower than the first safety value or the low-level insulation resistance Rb is lower than the second safety value, the control module 41 passes the The prompt module 42 outputs a prompt number, and the signal can be selected from the sound signal and the light signal to remind the staff that the resistance of the potential insulation resistance Ra or the low-level insulation resistance is insufficient. Therefore, since the measuring unit 2G (four) has a low complexity, only the switch 7G member SW and the measuring resistor Rc are required, and the other switching elements and the resistors are not required, so that the manufacturing cost is relatively low, and The calculation energy of the control module 41 respectively obtains the resistance value of the high-potential insulation resistance Ra and the low-potential insulation resistance Rb, which has a high reference value for the evaluation of the insulation effect of the manufacturer and the improvement of the leakage current, so that it contributes to The electric vehicle has a good and stable use effect. As shown in FIG. 1 and FIG. 5, it is worth mentioning that the first potential junction u can also be used to electrically connect the grounding end 921 or the vehicle body 93. The second potential 201226928 connector 22 can also be used to electrically connect the high. The end 913 ' of the voltage system 9 ι 'when the user uses the connection mode of FIG. 5 to perform the measurement, the high power is 彳, the f-function is, K~K'Ti

Ra = Rc 1+· Rb = Rc 1+- 1 + - K \f -wr ι \ vb~K) νβ~ν. <~vb: ΤΚ ν' Κ hzB,')) VB~Vb The second function is

When the switching element sv^ "gets the first - please measure the second electric device Vb when conducting, thereby

Vb, the opening and closing - TD, Ke knowledge, the insulation resistance measuring device 200 can also use the same operation principle to measure the high potential insulation resistance Ra fish / low potential insulation The function of the resistor Rt. However, the above is only the preferred embodiment of the present invention, and the scope of the present invention cannot be limited thereto, that is, the simplicity of the invention according to the scope of the patent (4) and the content of the manual. Variations and modifications are still within the scope of the invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a configuration of a general electric vehicle and a low voltage system; FIG. 2 is a schematic view showing a preferred embodiment of the electric vehicle measuring device of the present invention; Is a schematic diagram illustrating the circuit variation of the preferred real-time cutoff; FIG. 4 is a schematic diagram showing the circuit variation when turned on in the preferred embodiment; and the insulation resistance of a high voltage system, a switch Element, the switching element 201226928 The first potential diagram 5 is a schematic diagram illustrating the measurement of the connector and a second potential connector in the preferred embodiment. 10 201226928

[Description of main component symbols] 200... •...Insulation resistance measurement va,··.. •...Second voltage value device 90... •...Electric vehicle 20·····....Library measurement unit 91··.· • High voltage system 21 ·····•...Dielectric potential connector 911...—Motor 22······...Second potential connector 912... Inter-subsistence potential & SW... •...Switching element 913... •... The lowest potential end Rc · · .. •...Measurement resistance 92·.···•...Low voltage system 30 •...Voltage detection unit 921... •...Ground terminal 40·..·...•...Control unit 93·. .·· •... Body 41 ····· •...Control Module Ra... • · · _ Potential Insulation 42 •...not module resistance 43·.... •...storage module Rb... •...low Potential Insulation Power VB ···· •...The last voltage value resistance Va..... •...The first voltage value 11

Claims (1)

201226928 VII 1. Patent application scope: An insulation resistance measuring device for an electric vehicle, the electric vehicle comprising a voltage system and a low voltage system, the highest potential end of the high voltage system being opposite to the low voltage system - can be regarded as having a - high potential insulation resistance between the ground terminals. A low potential end of the high voltage system can be regarded as having a low potential insulation resistance with respect to the ground of the low voltage system. The measuring device comprises: a measuring unit comprising a first potential connector, a second potential connector, a switching element and a measuring resistor, the first potential connector is used for electrically connecting the highest potential end of the high voltage system The second potential connector is configured to connect to the ground end of the low voltage system, the switching element and the resistor are connected in series between the first potential connector and the second potential connector; a voltage detecting unit is configured to Detecting a voltage formed between the first potential connector and the second potential connector; Λ ^ a control unit comprising a control module capable of controlling the mountain The component is mounted or turned on. The control module has a voltage value of the highest potential terminal, a resistance value of the measuring resistor, a first function and a first function, wherein: When the switch element is turned off, the control module obtains a first voltage value between the first potential connector and the first potential connector via the voltage detector 7; When a switching element is turned on, the control module engages via the voltage. a second voltage value corresponding to the first potential connector and the second potential connector; 12 201226928 when the control module obtains the first power value and the first voltage value The group can use the 亥海* measured resistance value multiplied by the -帛-function to obtain the potential insulation resistance, and multiply the measured resistance value by the second function to obtain the low potential insulation resistance 'the first function and the second The function is a function of the highest voltage value 'the first voltage value' and the second voltage value. 2 3. According to the invention, the insulation resistance measuring device of the electric vehicle described in the above-mentioned patent, the control unit further includes a prompting module, the control module further has a first-safety value and a second The safety value is outputted by the control module when the high potential 'bar edge resistance is lower than the first safety value or the low potential insulation resistance is lower than the first safety value. According to the insulation resistance measurement of the electric vehicle according to claim 1, the control unit further includes a storage module, and the high-potential insulation resistance calculated by the control module and the low-level insulation resistance are recorded in In the storage module. Va KK) vB-va) 1 K' J. The second function is an insulation resistance measuring device for an electric vehicle according to claim 1 wherein the first function is b + , and the number is fi +ϋ二^Y_7a ~Fn ) l L 'where Vb is the highest electric value, va 疋 the first voltage value, Va, is the second voltage value 5 · a kind of electric vehicle insulation resistance measuring device' The electric vehicle includes a π voltage system 'and a low power system, the low voltage system is connected to the body of the electric vehicle, and the same potential end of the high voltage system is opposite to the low voltage system Between a ground terminal can be regarded as 13 201226928 has a high potential insulation resistance, the lowest potential * of the high voltage system can be regarded as having - low = 2 insulation resistance relative to the ground of the low voltage system, The insulation resistance measuring device comprises: an s measuring unit, comprising a Le-I bit connection, a - switching element 'and a measuring resistance', the first potential connector is for electrically connecting the ground end of the low voltage system, the second Potential connection for electrically connecting the high voltage system a voltage detecting unit, wherein the switching element and the resistor are connected in series between the first potential connector and the second potential connector, and a voltage detecting unit is configured to detect the first potential connector and the second potential connector The voltage formed between the two; the control unit includes a control module, and the control module can control the off or on of the switch element, and the control module has a highest voltage value and the quantity at the highest potential end. Measure the resistance value of the resistor, a first function 'and a second function, where: . - when the switching element is turned off, the control module detects via the voltage Obtaining a first voltage value that is right-off between the first potential connector and the second potential connector; and when the switching component is turned on, the control module obtains the a second voltage value between the first potential connector and the second potential connector; the control module can multiply the value of the measurement resistor by the control module when the first voltage value and the second voltage value are obtained a first function obtains a potential insulation resistance, and multiplies the measured resistance value by a second function to obtain the low potential insulation resistance, the first function and the second function are both 14 201226928 and the second voltage value The 疋3 hai is the most electric dust value, the first voltage value, and the function. 6. According to the application of the If! The electric vehicle (4) insulation resistance measuring device according to Item 5, wherein the control unit further comprises a prompting module, the control module further having a first safety value and a second safety value, when the height is high When the potential insulation resistance is lower than the first safety value or the low potential insulation resistance is lower than the second safety value, the control module outputs a prompt signal via the prompt module. The insulation resistance measuring device for an electric vehicle according to claim 5, wherein the control unit further comprises a storage module, wherein the high-potential insulation resistance calculated by the control module and the low-level insulation resistance are Recorded in the storage module. Device, where the number is +I κ The insulation resistance measurement function of the electric vehicle according to item 5 of the patent application scope is ίι+ ^ 1 (v〇-v〇') 1 K-VJ 1 ^ J where 'Vb is the raindrop potential of the second function Voltage The value 'vb is the value of the ignorance, vb, which is the second voltage value. 15