CN102818935A - Protection circuit and insulation resistance measurement device including protection circuit - Google Patents
Protection circuit and insulation resistance measurement device including protection circuit Download PDFInfo
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- CN102818935A CN102818935A CN2012101897104A CN201210189710A CN102818935A CN 102818935 A CN102818935 A CN 102818935A CN 2012101897104 A CN2012101897104 A CN 2012101897104A CN 201210189710 A CN201210189710 A CN 201210189710A CN 102818935 A CN102818935 A CN 102818935A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/36—Overload-protection arrangements or circuits for electric measuring instruments
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H75/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of power reset mechanism
- H01H75/10—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of power reset mechanism having only electromagnetic release
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Abstract
The present invention provides a protection circuit and an insulation resistance measurement device including the protection circuit. When a high voltage is applied on the protection circuit, the insulation resistance can be easily measured through the control of a constant current. The protection circuit includes a first constant current control unit and a second constant current control unit. The first constant current control unit controls the current in order to make the applied current be a predetermined first reference current. The second constant current control unit and the first constant current control unit are in a parallel connection. When the current applied to the first constant current control unit is equal to or greater than the predetermined first reference current, the current is controlled through the control of the current branch applied to the first constant current control unit.
Description
The cross reference of related application
The application requires to be called in the name that on June 9th, 2011 submitted to the rights and interests of the 10-2011-0055707 korean patent application of " holding circuit and the insulation measurement device that comprises this holding circuit ", and its full content is hereby expressly incorporated by reference.
Technical field
The present invention relates to a kind of holding circuit and comprise the insulation measurement device of this holding circuit, more specifically, relate to the insulation measurement device of insulation resistance that a kind of holding circuit and a kind of comprises the measurement detected object of this holding circuit.
Background technology
Generally, the insulation measurement device applies the DC voltage of the schedule time to detected object, after this, measures the electric current that flows on the detected object to measure the insulation resistance of detected object.
Yet under the situation of the insulation resistance that uses insulation measurement measurement device detected object, when the fault that takes place in the detected object such as short circuit, super-high-current is applied on the insulation measurement device, makes the insulation measurement device to be damaged.
For this reason; In correlation technique; Adopted a kind of mechanism through measuring the insulation resistance of detected object to the current-limiting circuit that the insulation measurement device increases and a plurality of current-limiting resistors are connected in parallel; And,, can prevent that also the insulation measurement device is damaged even when detected object is short-circuited through using this associated mechanisms.
Yet in the insulation measurement device in correlation technique, when the voltage levvl that is applied to detected object changed, the quantity of current-limiting resistor and type should be replaced, and this replacement causes and brought inconvenience.
Especially, when applying high voltage, although increased current-limiting circuit, ruined possibility is still improved the insulation measurement device and production cost also improves.
Summary of the invention
An object of the present invention is to provide a kind of holding circuit and comprise the insulation measurement device of this holding circuit, even applying under the high voltage situation, it still can come measurement insulation resistance easily through the control steady current.
According to an illustrative embodiments of the present invention, a kind of holding circuit is provided, comprising: the first steady current control module, Control current is so that the electric current that is applied is the first predetermined reference current; And the second steady current control module; Be connected in parallel with the first steady current control module; To equal at the electric current that is applied to the first steady current control module or when being higher than the first predetermined reference current, the electric current that is applied to the first steady current control module through control makes it shunt Control current.
At this, the first steady current control module can comprise first switch, and it is adjusted at the electric current that flows between drain electrode and the source electrode according to the voltage that is applied to grid, and making the electric current that between drain electrode and source electrode, flows with Control current is first reference current.
In addition, the first steady current control module can further comprise the first cancellation switch, and when the electric current that between the drain electrode of first switch and source electrode, flows was big greater than first reference current, the first cancellation switch was switched on to cancel the Current Control of first switch.
In addition, the first steady current control module can further comprise: first coupling mechanism applies voltage to the grid of first switch; And first voltage detector component, be connected with source series with the drain electrode of first switch, and produce electric potential difference according to the electric current that between the drain electrode of first switch and source electrode, flows.
In the case, the grid of first switch can be connected with the collector of the first cancellation switch and the source electrode of first switch can with first cancel switch base stage be connected.
Simultaneously, the second steady current control module can comprise a plurality of distribution members, and when the voltage that is applied to the first steady current control module was equal to, or greater than first reference voltage, a plurality of distribution members distributed the voltage that is applied to the first steady current control module.
In addition; The second steady current control module can further comprise second switch; Second switch has grid; Said grid is connected with the binding site of a plurality of distribution members; Be controlled at the electric current shunting of flowing between drain electrode and the source electrode of first switch when being equal to, or greater than the second predetermined reference voltage and between the drain electrode of second switch and source electrode, flow, and second switch this electric current of control is so that the electric current that between drain electrode and source electrode, flows is the second predetermined reference current at the voltage that is applied to this grid.
And the second steady current control module can further comprise the second cancellation switch, and when the electric current that between the drain electrode of second switch and source electrode, flows during greater than second reference current, the second cancellation switch is switched on the Current Control with the cancellation second switch.
In addition, the second steady current control module can further comprise second voltage detector component, and second voltage detector component is connected with source series with the drain electrode of second switch, and produces electric potential difference according to the electric current that between the drain electrode of second switch and source electrode, flows.
At this, the value of second reference current can be greater than the value of first reference current.
Simultaneously; According to another illustrative embodiments of the present invention; A kind of insulation measurement device of measuring the insulation resistance of detected object is provided; Said device comprises: holding circuit; Holding circuit comprises the first steady current control module and the second steady current control module; The first steady current control module Control current is so that be the first predetermined reference current from the electric current of detected object output, and the second steady current control module and the first steady current control module are connected in parallel, and the electric current that is applied to the first steady current control module through control when being equal to, or greater than the first predetermined reference current when the electric current that is applied to the first steady current control module shunts Control current; And current measurement circuit, through using the electric current of measuring detected object from the electric current of holding circuit output, wherein, a plurality of holding circuits are connected in series mutually.
At this, the first steady current control module can comprise: first switch, and it is adjusted at the electric current that flows between drain electrode and the source electrode according to the voltage that is applied to grid, and making the electric current that between this drain electrode and this source electrode, flows with Control current is first reference current; And the first cancellation switch, when the electric current that between the drain electrode of first switch and source electrode, flows during greater than first reference current, the first cancellation switch is switched on to cancel the Current Control of first switch.
In addition, the second steady current control module can comprise a plurality of distribution members, and when the voltage that is applied to the first steady current control module was equal to, or greater than first reference voltage, a plurality of distribution members distributed the voltage that is applied to the first steady current control module.
And; The second steady current control module can further comprise second switch; Second switch has grid; This grid is connected with the binding site of a plurality of distribution members; Be controlled at the electric current shunting of flowing between drain electrode and the source electrode of first switch when being equal to, or greater than the second predetermined reference voltage and between the drain electrode of second switch and source electrode, flow, and second switch this electric current of control is so that the electric current that between drain electrode and source electrode, flows is the second predetermined reference current at the voltage that is applied to this grid.
In addition, the second steady current control module can further comprise the second cancellation switch, and when the electric current that between the drain electrode of second switch and source electrode, flows during greater than second reference current, the second cancellation switch is switched on the Current Control with the cancellation second switch.
Simultaneously; According to another illustrative embodiments of the present invention; A kind of insulation measurement device of measuring the insulation resistance of detected object is provided; Said device comprises: holding circuit; Holding circuit comprises the first steady current control module and the second steady current control module; The first steady current control module Control current is so that be to be the first predetermined reference current from the electric current of detected object output, and the second steady current control module and the first steady current control module are connected in parallel, and the electric current that is applied to the first steady current control module through control when being equal to, or greater than the first predetermined reference current when the electric current that is applied to the first steady current control module makes it shunt Control current; And current measurement circuit, through using the electric current of measuring detected object from the electric current of holding circuit output, wherein, a plurality of holding circuits are interconnected to face one another.
At this, the insulation measurement device can further comprise a plurality of feed circuit, and a plurality of feed circuit have reversed polarity, to apply the voltage with different polarities to detected object.
In this case, a plurality of feed circuit can be connected in parallel mutually.
In addition; The insulation measurement device can further comprise switching circuit of power supply; This switching circuit of power supply is switched on or breaks off with the detected object in a plurality of feed circuit optionally and apply the voltage with opposed polarity; This switching circuit of power supply can comprise: first switching circuit of power supply, the one of which end by optionally with a plurality of feed circuit in one be connected; And second switching circuit of power supply, the one of which end by optionally with the other end of first switching circuit of power supply and ground wire in one be connected the surplus detected object connection of its other end.
In addition, the first steady current control module can comprise: first switch, and it is adjusted at the electric current that flows between drain electrode and the source electrode according to the voltage that is applied to grid, and making the electric current that between drain electrode and source electrode, flows with Control current is first reference current; And the first cancellation switch, when the electric current that between the drain electrode of first switch and source electrode, flows during greater than first reference current, the first cancellation switch connection is to cancel the Current Control of first switch.
And the second steady current control module can comprise a plurality of distribution members, and when the voltage that is applied to the first steady current control module was equal to, or greater than first reference voltage, a plurality of distribution members distributed the voltage that is applied to the first steady current control module.
In addition; The second steady current control module can further comprise second switch; It has grid; This grid is connected with the binding site of a plurality of distribution members; Make its shunting and between the drain electrode of second switch and source electrode, flow to be equal to, or greater than the electric current that flows between the drain electrode that is controlled at first switch when the second predetermined reference voltage and the source electrode when the voltage that is applied to this grid, and second switch this electric current of control is so that the electric current that between this drain electrode and this source electrode, flows is the second predetermined reference current.
In addition, the second steady current control module can further comprise the second cancellation switch, and when the electric current that between the drain electrode of second switch and source electrode, flows during greater than second reference current, the second cancellation switch is switched on the Current Control with the cancellation second switch.
Description of drawings
Fig. 1 is the structural map according to the holding circuit of exemplary embodiment of the invention;
Fig. 2 is the structural map according to the insulation measurement device of exemplary embodiment of the invention; And
Fig. 3 is the structural map according to the insulation measurement device of another illustrative embodiments of the present invention.
Embodiment
Before this; Employed term or speech should not be interpreted as usually and look like with dictionary in this instructions and the accompanying claims, and should be interpreted as the notion that can define said term suitably according to the inventor meaning and the notion consistent with spirit of the present invention with the principle of the invention describing him through best mode and had.
Correspondingly, the disclosed embodiments and shown in the accompanying drawings structure only are most preferred embodiment in this manual, but are not restricted to the spirit and scope of the present invention.Therefore, when this uses, should recognize that multiple equivalence and modification can be within the spirit and scope of the present invention involved.
After this, illustrative embodiments of the present invention will combine accompanying drawing to be described in detail.
Fig. 1 is the structural map according to the holding circuit of exemplary embodiment of the invention, and Fig. 2 is the structural map according to the insulation measurement device of exemplary embodiment of the invention.
As illustrated in fig. 1 and 2, holding circuit 10 is applied to the electric current of current measurement circuit 55 with stepless control between the current measurement circuit 55 of the electric current of detected object 5 and measurement detected object 5.
As a result, the input end In and the detected object 5 of holding circuit 10 are connected in series, and the output terminal Out and the current measurement circuit 55 of holding circuit 10 are connected in series.
The parts of holding circuit 10 will be described below.Holding circuit 10 comprises the first steady current control module 10a and the second steady current control module 10b.
Control current is so that the electric current that applies from input end In comprises the first coupling mechanism 12a, the first switch 14a, the first voltage detector component 16a and the first cancellation switch 18a for the first steady current control module 10a of the first predetermined reference current Iref1.
In the middle of them; The first coupling mechanism 12a will be applied to the grid of the first switch 14a from the voltage V1 of power supply 11 outputs; Light-emitting device produces light when electric current is applied to primary side; The first coupling mechanism 12a can be made up of the semiconductor element such as photo-coupler (PC), and its light that passes through to be produced produces voltage.
In addition, the first coupling mechanism 12a can be made up of the DC/DC converter, wherein, and primary side and primary side insulation.
As above describe, the first coupling mechanism 12a is arranged in the holding circuit 10 so that primary side and primary side mutual insulating.That is, as shown in Figure 2, in a plurality of holding circuits 10 to 10n mutually under the situation of series connection, when elementary side joint ground wire and secondary side ground wire not during mutual insulating, secondary side current is revealed from primary side, so can not accurately measure electric current with current measurement circuit 55.
The electric current that the first switch 14a (FET1) flows between drain electrode and source electrode according to the Control of Voltage that is applied to grid makes that to realize Current Control the electric current that between drain electrode and source electrode, flows is the first reference current Iref1.
More specifically, when the voltage that is applied to grid was equal to, or greater than the setting voltage of the first switch 14a, the first switch 14a was switched on to allow electric current between drain electrode and source electrode, to flow.Therefore, when the voltage of the grid that is applied to the first switch 14a during near 0 volt (0V), the current step that between the drain electrode of the first switch 14a and source electrode, flows weakens, and the result does not have electric current and between drain electrode and source electrode, flows.The first switch 14a through the repetitive operation Control current so that the electric current that between drain electrode and source electrode, flows is the first reference current Iref1.
The first switch 14a can be made up of mos field effect transistor (MOSFET), in addition also can be made up of bipolar transistor (BJT) and insulated gate bipolar transistor (IGBT).
The first voltage detector component 16a is made up of resistor R 11, drain electrode and the source series of the first voltage detector component 16a and the first switch 14a, and produce electric potential difference according to the electric current that between the drain electrode of the first switch 14a and source electrode, flows.One end of resistor R 11 is connected with the binding site of the source electrode of the first switch 14a with the base stage of the first cancellation switch 18a, and the other end of resistor R 11 is connected with ground wire.
When the electric current that between the drain electrode of the first switch 14a and source electrode, flows during greater than the first reference current Iref1, the electric potential difference of the first voltage detector component 16a increases the first cancellation switch 18a that next will describe to connect.
When the electric current that between the drain electrode of the first switch 14a and source electrode, flows during greater than the first reference current Iref1, the first cancellation switch 18a (TR1) is switched on, to cancel the Current Control of the first switch 14a.
More specifically, when the electric current that between the drain electrode of the first switch 14a and source electrode, flows during greater than the first reference current Iref1, the electric potential difference of the first voltage detector component 16a increases to be applied to the base stage of the first cancellation switch 18a.In addition, when the voltage of the base stage that is applied to the first cancellation switch 18a was equal to, or greater than the setting voltage of the first cancellation switch 18a, the first cancellation switch 18a was switched on, and is low to moderate near zero volt (0V) so that be applied to the voltage drop of the grid of the first switch 14a.Through this operation, the first cancellation switch 18a cancels the Current Control of the first switch 14a.
The first cancellation switch 18a can be made up of bipolar transistor (BJT), in addition also can be made up of mos field effect transistor (MOSFET) and insulated gate bipolar transistor (IGBT).
The second steady current control module 10b and the first steady current control module 10a are connected in parallel; And when the voltage that is applied to the first steady current control module 10a is equal to, or greater than the first predetermined reference voltage; The second steady current control module 10b makes its shunting (bypass) come Control current through the electric current that control is applied to the first steady current control module 10a, and comprises distribution member 12b, second switch 14b, the second voltage detector component 16b and the second cancellation switch 18b.
In the middle of them; Distribution member 12b is made up of with R22 a plurality of resistance R 21; When the voltage that is applied to the first steady current control module 10a was equal to, or greater than the first predetermined reference voltage, distribution member 12b distributed the voltage that is applied to the first steady current control module 10a.
More specifically; When the drain electrode of the first switch 14a and the voltage between the source electrode are equal to, or greater than first reference voltage (; When the big voltage of rated voltage (near 1500V) that applies than the first switch 14a), distribution member 12b distributes the voltage that is applied to a plurality of resistance R 21 and R22.
At this; When excessive electric current is applied to holding circuit 10; The Current Control function of the first and second switch 14a and 14b is damaged, and result, a plurality of resistance R 21 have big resistance with R22 so that reduced-current, and (near less than 0.1% electric current) flow to holding circuit 10.
In the case, a plurality of resistance R 21 and R22 can be set to the drain electrode that distributes the voltage Vm=first switch 14a and the voltage * R22/ (R21+R22) between the source electrode.
The grid of second switch 14b (FET2) is connected with the binding site of a plurality of resistance R 21 and R22; When the voltage that is applied to grid was equal to, or greater than the second predetermined reference voltage (setting voltage of second switch 14b), second switch 14b was controlled at the electric current that flows between drain electrode and the source electrode of the first switch 14a and makes its shunting and between the drain electrode of second switch 14b and source electrode, flow.
In addition, second switch 14b Control current is so that the electric current that between drain electrode and source electrode, flows is the second predetermined reference current Iref2.
More specifically, the voltage that is applied to the grid of second switch 14b is dispensed among a plurality of distribution member 12b, and works as the voltage that is distributed when being equal to, or greater than second reference voltage, and the voltage that is applied to the grid of second switch 14b also can increase.In the case; When the voltage of the grid that is applied to second switch 14b is equal to, or greater than second reference voltage; Second switch 14b is switched on, so that flow between the drain electrode of second switch 14b and source electrode at the electric current that flows between the drain electrode of the first switch 14a and the source electrode.In the case, because the second reference current Iref2 greater than the first reference current Iref1, does not have electric current to flow to the first switch 14a.
Be about zero volt (0V) if be applied to the voltage of the grid of second switch 14b, the current step that between the drain electrode of second switch 14b and source electrode, flows reduces, and making does not have electric current to flow between drain electrode and source electrode.Second switch 14b through the repetitive operation Control current so that the electric current that between drain electrode and source electrode, flows is the second reference current Iref2.
The second voltage detector component 16b is made up of resistance R 23, and the second voltage detector component 16b is connected with source series with the drain electrode of second switch 14b, and produces electric potential difference according to the electric current that between the drain electrode of second switch 14b and source electrode, flows.
One end of resistance R 23 is connected with the binding site of the source electrode of second switch 14b with the base stage of the second cancellation switch 18b, and the other end of resistance R 23 is connected with ground wire.
When the electric current that between the drain electrode of second switch 14b and source electrode, flows during greater than the second reference current Iref2, the electric potential difference of the second voltage detector component 16b increase with connect next will describe second cancel switch 18b.
When the electric current that flow to second switch 14b during greater than the second reference current Iref2, the second cancellation switch 18b (TR2) is switched on the Current Control with cancellation second switch 14b.
More specifically, when the electric current that between the drain electrode of second switch 14b and source electrode, flows during greater than the second reference current Iref2, the electric potential difference of the second voltage detector component 16b increases to be applied to the base stage of the second cancellation switch 18b.In addition, when the voltage of the base stage that is applied to the second cancellation switch 18b was equal to, or greater than the setting voltage of the second cancellation switch 18b, the second cancellation switch 18b was switched on, and was low to moderate approximately zero volt (0V) so that be applied to the voltage drop of the grid of second switch 14b.Through this operation, the Current Control of the second cancellation switch 18b cancellation second switch 14b.
In addition; When the intensity of the second reference current Iref2 is set to greater than the first reference current Iref1 and when high voltage (than the high voltage of rated voltage of the first switch 14a) when being applied to the first switch 14a; The first switch 14a is disconnected and second switch 14b is switched on; Flow to second switch 14b with the permission electric current, thereby prevent that holding circuit 10 is damaged.
Fig. 2 is the structural map according to the insulation measurement device of exemplary embodiment of the invention.
As shown in Figure 2, insulation measurement device 1 comprises a plurality of holding circuits 10 to 10n and current measurement circuit 55.
After this, describe in holding circuit shown in Figure 1 owing to have the parts of identical function, its description will be omitted.
A plurality of holding circuits 10 to 10n are connected in series mutually; And when the high voltage Vmeas greater than the rated voltage Vmax of the first switch 14a was applied to holding circuit 10, a plurality of holding circuits 10 to 10n connected so that the quantity n of rated voltage Vmax * holding circuit of high pressure Vmeas >=first switch 14a mutually.
When the following time of situation that is connected in series mutually two holding circuits and describes as an example, although the control module of steady current is set to identical setting value, constant current value changes according to the difference in the component feature of resistance and switch slightly.
In the case, when applying high voltage, electric current is controlled in having the holding circuit of less constant current value, and high voltage is applied between the input end and output terminal of holding circuit.In addition; The feasible rated voltage that is no more than the first switch 14a of second steady current control module 10b work; And the electric current that between the drain electrode of second switch 14b and source electrode, flows is applied to another holding circuit with big steady current sharing high pressure, thereby the adjustment balance of voltage.
Correspondingly, when a plurality of holding circuits 10 to 10n were connected in series mutually, high voltage was assigned with below the rated voltage that is controlled in switch.
Fig. 3 is the structural map according to the insulation measurement device of another illustrative embodiments of the present invention.
As shown in Figure 3, the insulation measurement device comprises a plurality of holding circuit 10 to 10n, current measurement circuit 55, feed circuit 75 and switching circuit of power supply 85.
A plurality of holding circuits 10 to 10n face one another (face each other) and connect.For example; When four holding circuits are connected in series mutually; The input end of first holding circuit 10 is connected to detected object 5; The output terminal Out of first holding circuit 10 is connected with the input end In of second holding circuit 20, and the output terminal Out of second holding circuit 20 is connected with the output terminal Out of the 3rd holding circuit 30.Further, the input end In of the 3rd holding circuit 30 is connected with the output terminal Out of the 4th holding circuit 40, and the input end In of the 4th holding circuit 40 is connected with current measurement circuit 55.
As above described, through a plurality of holding circuits 10 to 10n are faced one another connection, even apply the forward and the reverse bidirectional current of charge/discharge for example or apply AC voltage, electric current also can Be Controlled.
More specifically, current controlled system only in a plurality of holding circuits shown in Fig. 2 10 to 10n from input end towards output terminal.Its reason be through drain electrode and the parasitic diode between the source electrode that use is connected in each first and second switch 14a and 14b in parallel make electric current with direction in the opposite direction from the output terminal to the input end on unrestricted flows.The result; Under the situation of the reversing of dc voltage; Is under the situation of capacitor in polarity by mutual counter-rotating (being similar to AC voltage) or detected object 5; Even for because direction charge/discharge current still can Control current when changing, a plurality of holding circuits 10 to 10n are faced one another connection.
As above described, when electric current flowed on the P direction, first and second holding circuits 10 and 20 work were with Control current, and when electric current flowed on the Q direction, third and fourth holding circuit 30 and 40 work were with Control current.
In addition, insulation measurement device 1 further comprises having reversed polarity applying a plurality of feed circuit 75 of the voltage with opposed polarity to detected object 5, and a plurality of feed circuit 75 are connected in parallel mutually.
As shown in Figure 3, a plurality of feed circuit 75 comprise first and second feed circuit Ps_N and the Ps_p, and the first and second feed circuit Ps_N and Ps_p have mutual antipole property.For example; Because the first feed circuit Ps_N is connected to apply negative (-) voltage and the second feed circuit Ps_p to detected object 5 and is connected applying just (+) voltage to detected object 5, so through adopting a plurality of feed circuit Ps_N and Ps_p can be easily alternately to apply negative (-) voltage and (+) voltage just to detected object 5.
Switching circuit of power supply 85 constitutes by being switched on or breaking off the first and second switching circuit of power supply 85a and the 85b that apply the voltage with opposed polarity with the detected object 5 in a plurality of feed circuit 75 optionally.
The end of the first switching circuit of power supply 85a optionally with a plurality of feed circuit Ps_N and Ps_P in one be connected.That is, the end of the first switching circuit of power supply 85a can be connected with the first feed circuit Ps_N or the second feed circuit Ps_P.
The end of the second switching circuit of power supply 85b optionally with the other end of the first switching circuit of power supply 85a and ground wire in one be connected, the other end of the second switching circuit of power supply 85b is connected with detected object 5.
Next will describe the operation of switching circuit of power supply 85 in detail.The first switching circuit of power supply 85a connects towards the first feed circuit Ps_N, and the second switching circuit of power supply 85b connects towards the first switching circuit of power supply 85a, to apply negative (-) voltage of the first feed circuit Ps_N to detected object 5.
The first switching circuit of power supply 85a connects towards the second feed circuit Ps_P, and the second switching circuit of power supply 85b connects towards the first feed circuit 85a, to apply just (+) voltage of the second feed circuit Ps_P to detected object 5.
Owing to can alternately apply just (+) voltage and negative (-) voltage to detected object 5 through operation; Therefore; Polarity chron at the counter-rotating dc voltage; Reverse each other in polarity (being similar to AC voltage) or detected object is under the situation of capacitor, even when direction of current is changed, electric current still can be by control easily.
As above described, according to an illustrative embodiment of the invention, even holding circuit and the insulation measurement device that comprises holding circuit still can easily be controlled steady current applying under the high-tension situation.
That is,, can both control steady current easy and safely even apply each voltage from the low-voltage to the high voltage range.
As a result, even under the situation of detected object generation, can prevent that also super-high-current from flowing into the insulation measurement device such as the fault of short circuit.
In addition, even when detected object is the capacity load such as capacitor, also can be with steady current to the detected object charge/discharge, the result, charge is shortened.
In addition, because the whole protecting circuit is in quick condition, therefore,, also can prevent the mistake that causes owing to electric leakage that relatively poor insulation produces even when the micro-signal of measuring such as the insulation resistance of detected object.
Though having combined to be considered to now practical example property embodiment, the present invention is described; Be to be understood that; The present invention is not limited at disclosed embodiment, but opposite, is intended to contain the spirit and interior multiple modification and the equivalent arrangements of scope that are included in accompanying claims.
Claims (24)
1. holding circuit comprises:
The first steady current control module, Control current is so that the electric current that is applied is the first predetermined reference current; And
The second steady current control module; Be connected in parallel with the said first steady current control module; When being equal to, or greater than predetermined said first reference current at the electric current that is applied to the said first steady current control module, the electric current that is applied to the said first steady current control module through control makes it shunt Control current.
2. holding circuit according to claim 1; Wherein, The said first steady current control module comprises first switch; Said first switch is adjusted at the electric current that flows between drain electrode and the source electrode according to the voltage that is applied to grid, and making the electric current that between said drain electrode and said source electrode, flows with Control current is said first reference current.
3. holding circuit according to claim 2; Wherein, The said first steady current control module further comprises the first cancellation switch; When the electric current that between the said drain electrode of said first switch and said source electrode, flows during greater than said first reference current, the said first cancellation switch is switched on to cancel the Current Control of said first switch.
4. holding circuit according to claim 3, wherein, the said first steady current control module further comprises:
First coupling mechanism applies voltage to the said grid of said first switch; And
First voltage detector component is connected with said source series with the said drain electrode of said first switch, and produces electric potential difference according to the electric current that between the said drain electrode of said first switch and said source electrode, flows.
5. holding circuit according to claim 3, wherein, the said grid of said first switch is connected with the collector of the said first cancellation switch, and the said source electrode of said first switch is connected with the base stage of the said first cancellation switch.
6. holding circuit according to claim 2; Wherein, The said second steady current control module comprises a plurality of distribution members; When the voltage that is applied to the said first steady current control module was equal to, or greater than first reference voltage, said a plurality of distribution members distributed the voltage that is applied to the said first steady current control module.
7. holding circuit according to claim 6; Wherein, The said second steady current control module further comprises second switch; Said second switch has grid; Said grid is connected with the binding site of a plurality of said distribution members, be controlled at the electric current that flows between said drain electrode and the said source electrode of said first switch when being equal to, or greater than the second predetermined reference voltage when the voltage that is applied to said grid and make its shunting and between the drain electrode of said second switch and source electrode, flow, and said second switch Control current is so that the electric current that between said drain electrode and said source electrode, flows is predetermined said second reference current.
8. holding circuit according to claim 7; Wherein, The said second steady current control module further comprises the second cancellation switch; When the electric current that between the drain electrode of said second switch and source electrode, flows during greater than said second reference current, the said second cancellation switch is switched on to cancel the Current Control of said second switch.
9. holding circuit according to claim 7; Wherein, The said second steady current control module further comprises second voltage detector component; The drain electrode of said second voltage detector component and said second switch and source series, and produce electric potential difference according to the electric current that between the drain electrode of said second switch and source electrode, flows.
10. holding circuit according to claim 7, wherein, the value of said second reference current is greater than the value of said first reference current.
11. an insulation measurement device of measuring the insulation resistance of detected object, said device comprises:
Holding circuit; Said holding circuit comprises the first steady current control module and the second steady current control module; The said first steady current control module Control current is so that the electric current of exporting from said detected object is the first predetermined reference current; Said second steady current control module and the said first steady current control module are connected in parallel, and the electric current that is applied to the said first steady current control module through control when being equal to, or greater than predetermined said first reference current when the electric current that is applied to the said first steady current control module makes it shunt Control current; And
Current measurement circuit, through being applied in the electric current of measuring said detected object from the electric current of said holding circuit output,
Wherein, a plurality of said holding circuits are connected in series mutually.
12. insulation measurement device according to claim 11, wherein, the said first steady current control module comprises:
First switch, said first switch is adjusted at the electric current that flows between drain electrode and the source electrode according to the voltage that is applied to grid, and making the electric current that between said drain electrode and said source electrode, flows with Control current is said first reference current; And
The first cancellation switch, when the electric current that between the said drain electrode of said first switch and said source electrode, flows during greater than said first reference current, the said first cancellation switch is switched on to cancel the Current Control of said first switch.
13. insulation measurement device according to claim 11; Wherein, The said second steady current control module comprises a plurality of distribution members; When the voltage that is applied to the said first steady current control module was equal to, or greater than first reference voltage, said a plurality of distribution members distributed the voltage that is applied to the said first steady current control module.
14. insulation measurement device according to claim 13; Wherein, The said second steady current control module further comprises second switch; Said second switch has grid; Said grid is connected with the binding site of said a plurality of distribution members, be controlled at the electric current that flows between said drain electrode and the said source electrode of said first switch when being equal to, or greater than the second predetermined reference voltage when the voltage that is applied to said grid and make its shunting and between the drain electrode of said second switch and source electrode, flow, and said second switch Control current is so that the electric current that between said drain electrode and said source electrode, flows is the second predetermined reference current.
15. insulation measurement device according to claim 14; Wherein, The said second steady current control module further comprises the second cancellation switch; When the electric current that between the drain electrode of said second switch and source electrode, flows during greater than said second reference current, the said second cancellation switch is switched on to cancel the Current Control of said second switch.
16. an insulation measurement device of measuring the insulation resistance of detected object, said device comprises:
Holding circuit; Said holding circuit comprises the first steady current control module and the second steady current control module; The said first steady current control module Control current is so that the electric current of exporting from detected object is the first predetermined reference current; Said second steady current control module and the said first steady current control module are connected in parallel, and the electric current that is applied to the said first steady current control module through control when being equal to, or greater than predetermined said first reference current when the electric current that is applied to the said first steady current control module makes it shunt Control current; And
Current measurement circuit, through being applied in the electric current of measuring said detected object from the electric current of said holding circuit output,
Wherein, a plurality of said holding circuits connect to face one another mutually.
17. insulation measurement device according to claim 16 further comprises a plurality of feed circuit, said a plurality of feed circuit have reversed polarity to apply the voltage with opposed polarity to said detected object.
18. insulation measurement device according to claim 17, wherein, said a plurality of feed circuit are connected in parallel mutually.
19. insulation measurement device according to claim 17; Further comprise switching circuit of power supply, said switching circuit of power supply is switched on or breaks off with the said detected object in said a plurality of feed circuit and optionally apply the voltage with opposed polarity.
20. insulation measurement device according to claim 19, wherein, said switching circuit of power supply comprises:
First switching circuit of power supply, an end of said first switching circuit of power supply optionally with said a plurality of feed circuit in one be connected; And
Second switching circuit of power supply, an end of said second switching circuit of power supply optionally with the other end of said first switching circuit of power supply and ground wire in one be connected, the other end of said second switching circuit of power supply is connected with said detected object.
21. insulation measurement device according to claim 16, wherein, the said first steady current control module comprises:
First switch, said first switch is adjusted at the electric current that flows between drain electrode and the source electrode according to the voltage that is applied to grid, and making the electric current that between said drain electrode and said source electrode, flows with Control current is said first reference current; And
The first cancellation switch, when the electric current that between the said drain electrode of said first switch and said source electrode, flows during greater than said first reference current, the said first cancellation switch is switched on to cancel the Current Control of said first switch.
22. insulation measurement device according to claim 16; Wherein, The said second steady current control module comprises a plurality of distribution members; When the voltage that is applied to the said first steady current control module was equal to, or greater than first reference voltage, said a plurality of distribution members distributed the voltage that is applied to the said first steady current control module.
23. insulation measurement device according to claim 22; Wherein, The said second steady current control module further comprises second switch; Said second switch has grid, and said grid is connected with the binding site of said a plurality of distribution members, is controlled at the electric current that flows between said drain electrode and the said source electrode of said first switch when being equal to, or greater than the second predetermined reference voltage when the voltage that is applied to said grid and makes its shunting and between the drain electrode of said second switch and source electrode, flow; And said second switch Control current, so that the electric current that between said drain electrode and said source electrode, flows is the second predetermined reference current.
24. insulation measurement device according to claim 23; Wherein, The said second steady current control module further comprises the second cancellation switch; When the electric current that between the drain electrode of said second switch and source electrode, flows during greater than said second reference current, the said second cancellation switch is switched on to cancel the Current Control of said second switch.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020110055707A KR101251831B1 (en) | 2011-06-09 | 2011-06-09 | Protection circuit and insulation resistance measuring apparatus comprising the same |
| KR10-2011-0055707 | 2011-06-09 |
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| Publication Number | Publication Date |
|---|---|
| CN102818935A true CN102818935A (en) | 2012-12-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012101897104A Pending CN102818935A (en) | 2011-06-09 | 2012-06-08 | Protection circuit and insulation resistance measurement device including protection circuit |
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| Country | Link |
|---|---|
| JP (1) | JP2012255784A (en) |
| KR (1) | KR101251831B1 (en) |
| CN (1) | CN102818935A (en) |
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| CN104330637B (en) * | 2014-10-10 | 2017-05-17 | 国家电网公司 | 500KV transformer direct-current resistance and direct-current demagnetization intelligent test method |
| CN113874738B (en) | 2019-10-29 | 2024-05-07 | 株式会社Lg新能源 | Leakage detection device, leakage detection method and electric vehicle |
| JP7440475B2 (en) * | 2021-11-05 | 2024-02-28 | 日本電子株式会社 | High voltage amplifier circuit and analyzer |
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| JP3799977B2 (en) * | 2000-09-11 | 2006-07-19 | 株式会社村田製作所 | DC constant current circuit and capacitor insulation resistance measuring device |
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Also Published As
| Publication number | Publication date |
|---|---|
| KR20120136652A (en) | 2012-12-20 |
| KR101251831B1 (en) | 2013-04-09 |
| JP2012255784A (en) | 2012-12-27 |
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