CN101714825B - Convertor device - Google Patents
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- CN101714825B CN101714825B CN 200910147248 CN200910147248A CN101714825B CN 101714825 B CN101714825 B CN 101714825B CN 200910147248 CN200910147248 CN 200910147248 CN 200910147248 A CN200910147248 A CN 200910147248A CN 101714825 B CN101714825 B CN 101714825B
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Abstract
In a convertor device of the invention, when a power supply connected to an electrolysis condenser (5) is broken off, a switch control circuit (6a) provides current for a load through enabling a switch element of a convertor main circuit (7a) to actuate to enable charges of the electrolysis condenser (5) to discharge, and at the same time, an electrostatic capacity calculator (10a) of the electrolysis condenser works out the electrostatic capacity of the electrolysis condenser according to the discharge charge quantity solved by the discharge current (Ic) from the electrolysis condenser (5) and the discharge time and a discharge voltage (delta V) serving as the voltage drop quantity of the electrolysis condenser (5) after the discharge is started.
Description
The application is based on the PCT/JP2003/003134 (China national application number 03811292.2) that proposed on March 17th, 2003 and applies for dividing an application of (convertor device), below quotes its content.
Invention field
The present invention relates to differentiate the convertor device in the life-span of the electrolytic capacitor that uses in the convertor device.
Background technology
As everyone knows, use electrolytic capacitor in the main circuit smooth of voltage source converter device, but owing to this electrolytic capacitor life-span is limited, in general, if behind the certain hour of convertor device through design, just be considered as the life-span of electrolytic capacitor, need to change electrolytic capacitor.Yet, change because life-span of electrolytic capacitor produces significantly with the environment for use of converter device, therefore following situation is arranged sometimes, namely passed through the certain hour of design, although electrolytic capacitor also do not worsen, will its replacing; On the contrary, although electrolytic capacitor worsen owing to also not having certain hour through design, thus do not thought electrolytic capacitor life-span and do not change.
Disclose a kind of convertor device in the patent documentation 1 (Unexamined Patent 11-98854 communique), can differentiate the life-span of the electrolytic capacitor that uses in the convertor device.The convertor device that electrolytic capacitor is used for the main circuit smooth of record comprises electrolytic capacitor life-span judgement unit in the patent documentation 1, and this electrolytic capacitor life-span judgement unit is made of following part: the discharge resistance that is connected in parallel with electrolytic capacitor; Monitor the current detection section of the both end voltage of electrolytic capacitor; With the judgement part, when interruption is supplied with to the voltage of electrolytic capacitor, measurement is by the discharge time constant t (t=CR) of discharge with the electrostatic capacitance C decision of resistance R and electrolytic capacitor, when the electrostatic capacitance of being calculated by this measured value exceeds in advance the tolerance band of electrostatic capacitance of this electrolytic capacitor of obtaining as benchmark, judge that then this electrolytic capacitor is to the life-span.
Patent documentation 2 (Unexamined Patent 11-231008 communique) discloses the capacitor life-span diagnostic device take life-span of Precise Diagnosis capacitor as target.In patent documentation 2, supply voltage access or apply after stopping at least one constantly, the both end voltage of multi-point sampling capacitor, when obtaining time constant T from each sampled voltage, according to the T/R formula, for example be connected with capacitor in the switching power unit by known resistance value, prevent the resistance R of the resistance of inrush current, the capacitor C 0 of capacitor is obtained in computing, the variation of the resistance R of the resistance that causes with respect to the variation of having considered environment temperature ± Δ R, in theory the poorest capacitor C r=T/ (R ± Δ R) of the capacitor of the capacitance variations of capacitor+Δ C+Δ C, when the capacitor C 0 of judging capacitor is equal to or less than this capacitor C r, then is judged as capacitor and electric capacity has occurred and reduce.
In the disclosed main circuit power charging method of patent documentation 3 (Unexamined Patent 11-89264 communique), the special-purpose discharge circuit that does not use discharge to consist of with resistance is disclosed, but utilize the closed circuit current direction motor that makes that forms with motor, thereby the technology that the charging residual voltage of capacitor is discharged as load loss.In patent documentation 3, when the direct-current input power supplying to main circuit is disconnected, to control from the motor driven controls metastasis is discharge mode, utilization is closed circuit with the motor composition, make the current direction motor, thereby the charging voltage of capacitor is consumed discharge as load loss or as the torque energy that makes motor and load operation.
In above-mentioned patent documentation 1 or patent documentation 2, there are the following problems, namely because in the life-span projection of electrolytic capacitor, having used resistance (to be discharge resistance in the patent documentation 1, be the resistance that prevents inrush current in the patent documentation 2), so when since the variations in temperature around the resistance so that resistance value when change, measuring in the life-span projection of the electrolytic capacitor that carries out by time constant, be difficult to guarantee precision.
In addition, there are the following problems, if the thermal capacitance of the resistance that uses in the discharge of electrolytic capacitor is reduced, then resistance value becomes large, and the capacitor output current reduces, the mensuration that therefore can prolong discharge time, on the contrary, if reduce resistance value to shorten the minute of discharge time, then because the power of resistance consumption becomes large, thereby the large resistance of thermal capacitance need to be set, so the convertor device size will become large.
In addition, even if there are the following problems, because the resistance and the electrolytic capacitor that use in the discharge of electrolytic capacitor are adjacent, so the caloric value in the scope of application of resistance, also can be so that the electrolytic capacitor body temperature rise, this will become the reason of the electrostatic capacitance change that makes electrolytic capacitor.
The present invention proposes in order to address the above problem, the convertor device in purpose is life-span of obtaining judging accurately electrolytic capacitor, can accurately judge electrolytic capacitor replacing period.
Summary of the invention
Convertor device of the present invention has: as the electrolytic capacitor of DC power supply; Inverter main circuit with switch element is alternating voltage with the dc voltage conversion of this electrolytic capacitor; ON-OFF control circuit, output are carried out the control signal of on/off control to the switch element of this inverter main circuit; And electrolytic capacitor electrostatic capacitance calculator, calculate the electrostatic capacitance of electrolytic capacitor, it is characterized in that: when interrupting being connected to the power supply of electrolytic capacitor, ON-OFF control circuit is by making the switch element action of inverter main circuit, make electric current flow through external loading, thereby make the charge discharge of electrolytic capacitor, simultaneously, electrolytic capacitor electrostatic capacitance calculator is according to the discharge charge amount, and as the discharge voltage of the amount of pressure drop after discharge beginning of electrolytic capacitor, and calculate the electrostatic capacitance of electrolytic capacitor, the discharge charge amount is based on the on/off time ratio of the switch element of converter output current and inverter main circuit and obtains, and the converter output current is to be detected by the current detector that the outlet side of inverter main circuit arranges.Therefore; can grasp the absolute value of the electrostatic capacitance of electrolytic capacitor; but and the life-span of correct Prediction electrolytic capacitor; can intactly use in general converter for element protection with load control and to each mutually additional current detector, and can realize at an easy rate the life prediction of electrolytic capacitor.
Also have, in convertor device of the present invention, when interrupting being connected to the power supply of electrolytic capacitor, ON-OFF control circuit makes the side switch element of the specific phase in the inverter main circuit and side switch element carry out the on/off action by output, the side switch element normal off of other phase, the control signal of side switch element normal open, make electric current flow through external loading, thereby make the charge discharge of electrolytic capacitor, simultaneously, electrolytic capacitor electrostatic capacitance calculator is according to the discharge charge amount of being obtained by the converter output current of the detected specific phase of current detector and specific one mutually the on/off time ratio of switch element, and as the discharge voltage of the amount of pressure drop after discharge beginning of electrolytic capacitor, calculate the electrostatic capacitance of electrolytic capacitor, therefore do not need to calculate discharge time, but life-span of correct Prediction electrolytic capacitor just.
Have, convertor device of the present invention has again: as the electrolytic capacitor of DC power supply; Inverter main circuit with switch element is alternating voltage with the dc voltage conversion of this electrolytic capacitor; ON-OFF control circuit, output are carried out the control signal of on/off control to the switch element of this inverter main circuit; And electrolytic capacitor electrostatic capacitance calculator, calculate the electrostatic capacitance of electrolytic capacitor, it is characterized in that: when interrupting being connected to the power supply of electrolytic capacitor, ON-OFF control circuit makes the side switch element of the specific phase in the inverter main circuit and side switch element carry out the on/off action by output, the side switch element normal off of other phase, the control signal of side switch element normal open, make electric current flow through external loading, thereby make the charge discharge of electrolytic capacitor, simultaneously, electrolytic capacitor electrostatic capacitance calculator is according to the discharge charge amount of obtaining from the electric current that is flowed out by electrolytic capacitor and the turn-on time of carrying out the on/off action, and as the discharge voltage of the amount of pressure drop after discharge beginning of electrolytic capacitor, calculate the electrostatic capacitance of electrolytic capacitor, therefore can use cheap nonisulated current detector.
In addition, in convertor device of the present invention, ON-OFF control circuit arranges comparator and current controller at input side, the electric current that flows out from electrolytic capacitor that described comparator uses the current instruction value that uses when the control signal of the switch element that generates on/off control change device main circuit and electrolytic capacitor electrostatic capacitance calculator or the electric current suitable with the electric current that flows out from electrolytic capacitor compare, described current controller is for the overcurrent of the outlet side that prevents this comparator, when therefore externally load is moved, even if in the situation that the inductance of winding changes, also can control and not produce overcurrent, and can correctly calculate the electrostatic capacitance of electrolytic capacitor.
In addition, convertor device of the present invention comprises the abnormal signal output circuit, when the electrostatic capacitance of the electrolytic capacitor of being calculated by electrolytic capacitor electrostatic capacitance calculator is lower than predefined the first electrostatic capacitance License Value, the output abnormality signal, so the user can judge easily that electrolytic capacitor changes period.
And, the abnormal signal output circuit of convertor device of the present invention can be set the second electrostatic capacitance License Value larger than the first electrostatic capacitance License Value, simultaneously when the electrostatic capacitance of the electrolytic capacitor of being calculated by electrolytic capacitor electrostatic capacitance calculator is lower than this second electrostatic capacitance License Value, export the signal of giving advance notice, therefore the user just can judge and changes period near electrolytic capacitor, can prepare electrolytic capacitor and more change jobs.
Description of drawings
Fig. 1 is the structure chart of the convertor device of expression embodiment of the present invention 1;
Fig. 2 is the structure chart of the convertor device of expression embodiment of the present invention 2;
Fig. 3 is the structure chart of the convertor device of expression embodiment of the present invention 3;
Fig. 4 is the equivalent circuit diagram of inverter main circuit of the convertor device of expression embodiment of the present invention 3;
Fig. 5 is the graph of a relation that electrolytic capacitor flows out electric current I c and U phase current Iu in the convertor device of expression embodiment of the present invention 3;
Fig. 6 is the figure of structure of the convertor device of expression embodiment of the present invention 4;
Fig. 7 is the equivalent circuit diagram of inverter main circuit of the convertor device of expression embodiment of the present invention 4;
Fig. 8 is the structure chart of ON-OFF control circuit of the convertor device of expression embodiment of the present invention 5;
Fig. 9 is the structure chart of the convertor device of expression embodiment of the present invention 6.
Embodiment
Structure and the processing of the convertor device of embodiment of the present invention 1 are described according to Fig. 1.Among Fig. 1, convertor device 1a is connected with source power supply 2 through circuit breaker 3, is direct voltage by rectifier 4 with the AC voltage conversion of the commercial frequency of source power supply 2, and the direct voltage after the conversion is level and smooth by electrolytic capacitor 5.Be used to from the control signal of ON-OFF control circuit 6a the switch element that consists of inverter main circuit 7a be carried out on/off control, thus direct current be transformed to the alternating current of assigned frequency, assigned voltage, drive the motor 8 as load.
Electrolytic capacitor electrostatic capacitance calculator 10a has the timer of the discharge time when measuring the electrolytic capacitor discharge, according to voltage, the current detector 12a of the detected electrolytic capacitor 5 of voltage detector 11a detected outflow electric current and discharge time from electrolytic capacitor 5, calculate the electrostatic capacitance of electrolytic capacitor 5.
The following describes the method for life prediction of the electrolytic capacitor 5 of the convertor device 1a that carries out execution mode 1.
When convertor device 1a runs well, supply with source power supplies through circuit breaker 3 to rectifier 4, will export to motor 8 by the interchange that inverter main circuit 7a is controlled to be optional frequency.Wherein, when interrupting source power supply 2 by circuit breaker 3, still be in the state that stores electric charge in the electrolytic capacitor 5.
Then, when the electric charge that makes the switch element action of inverter main circuit 7a, stores in electrolytic capacitor 5 was switched in the motor 8, this electric charge was by motor 8 repid discharges.Motor 8 has the capacity of several kW or tens of kW, therefore the heat that produces during repid discharge does not produce any impact to motor itself, and because motor 8 is not adjacent with electrolytic capacitor 5, even if so motor 8 temperature own produce large variation, can not exert an influence to electrolytic capacitor 5 yet.
During discharge, electrolytic capacitor electrostatic capacitance calculator 10a obtains the discharge voltage Δ V as the amount of pressure drop after the discharge beginning according to the voltage of the detected electrolytic capacitor 5 of voltage detector 11a.T is that electrolytic capacitor flows out electric current I c integration to the detected electric current that flows out from electrolytic capacitor 5 of current detector 12a with discharge time, obtains the discharge charge amount.Then, according to discharge voltage Δ V and discharge charge amount, through type (1) is calculated the electrostatic capacitance C of electrolytic capacitor 5.
Electrostatic capacitance C=discharge charge amount/discharge voltage
＝∫(Ic×t)/ΔV .........(1)
As mentioned above, detect the voltage and current of electrolytic capacitor, obtain the electrostatic capacitance of electrolytic capacitor 5, therefore can grasp the electrostatic capacitance as the electrolytic capacitor 5 of absolute value, can more correctly implement the life prediction of electrolytic capacitor.
But, to be the timer that has the discharge time when measuring the electrolytic capacitor discharge in electrolytic capacitor electrostatic capacitance calculator 10a describe as example the above, yet can utilize the (not shown) such as microcomputer that are assembled in the converter to measure discharge time.
Execution mode 2
Structure and the processing of the convertor device of embodiment of the present invention 2 are described according to Fig. 2.Among Fig. 2,2～5,6a, 7a, 8 identical with Fig. 1, the description thereof will be omitted.In addition, voltage detector 11b consists of as follows, so that in the voltage that detects electrolytic capacitor 5, obtain the discharge voltage Δ V as the amount of pressure drop after the discharge beginning, and in each of the outlet side of inverter main circuit 7a current detector 12b is set mutually.
Electrolytic capacitor electrostatic capacitance calculator 10b is according to the converter output current Iu by detected each phase of current detector 12b, Iv, Iw and by ON-OFF control circuit 6a output, and be used for the switch element that consists of inverter main circuit 7a is carried out the control signal of on/off control, obtain the discharge charge amount of electrolytic capacitor 5, the discharge voltage Δ V of the electrolytic capacitor 5 that then uses this discharge charge amount and obtained by voltage detector 11b calculates the electrostatic capacitance of electrolytic capacitor 5.
As the method for the quantity of electric charge of calculating this electrolytic capacitor 5 and electrostatic capacitance, the situation that situation, (b) that obtains by analog circuit for (a) utilizes the microcomputer that convertor device carries etc. to obtain, carry out following explanation:
Situation about (a) obtaining by analog circuit
If the converter output current of each phase is Iu, Iv, Iw represents that the variable sign of the switch situation of each phase is sign=1, is sign=-1 that then the discharge charge amount of electrolytic capacitor can be calculated according to formula (2) when the side switch element switches when the side switch element switches.Here, Iu, Iv, Iw has polarity, with the direction from convertor device to load for just.
Discharge charge amount=the ∫ (1/2) of electrolytic capacitor * { Iu * sign (u)+Iv * sign (v)+Iw * sign (w) } dt ... .. (2)
In addition, according to formula (3), use the discharge charge amount of the electrolytic capacitor of being calculated by formula (2) and as at the discharge voltage Δ V of the amount of pressure drop after beginning that discharges, can obtain the electrostatic capacitance C of electrolytic capacitor 5.
Electrostatic capacitance C=∫ (1/2) * { Iu * sign (u)+Iv * sign (v)+Iw * sign (w) } dt/ Δ V
.......(3)
(b) situation of utilizing the microcomputer that carries at convertor device etc. to obtain
If the converter output current of each phase is Iu, Iv, Iw, be UPon the turn-on time of the side switch element of each phase, VPon, WPon, when switch periods is T, then the discharge charge amount of electrolytic capacitor 5 can be calculated according to formula (4).
Discharge charge amount=the ∑ of electrolytic capacitor (Iu * UPon/T+Iv * VPon/T+Iw * WPon/T)
.........(4)
In addition, the electrostatic capacitance C of electrolytic capacitor 5 can obtain according to formula (5).
Electrostatic capacitance C=∑ (Iu * UPon/T+Iv * VPon/T+Iw * WPon/T)/Δ V
..........(5)
As mentioned above, in the convertor device 1b of execution mode 2, utilize the on/off state of the switch element that consists of inverter main circuit 7a, can calculate the electrostatic capacitance of electrolytic capacitor 5.
In the convertor device 1a of execution mode 1; the current detector 12a that shows by special use detects from the example of the outflow electric current of electrolytic capacitor 5 outflows; but in the convertor device 1b of execution mode 2; can use in general converter and to be used for element protection or Motor Control and at the current detector 12b that each phase of the outlet side of inverter main circuit 7 is installed, therefore can to realize low cost.
Structure and the processing of the convertor device of embodiment of the present invention 3 are described according to Fig. 3.Among Fig. 3,5,8,11a is identical with Fig. 1, the description thereof will be omitted.ON-OFF control circuit 6c exports control signal when source power supply interrupts, this control signal only makes the switch element of U phase carry out on/off action, for V phase and W mutually, makes side switch element normal off, makes side switch element normal open.In addition, the outlet side in U phase (when source power supply interrupts, carrying out a specific phase of on/off action) arranges current detector 12c.
In addition, in inverter main circuit 7c, at the side switch element of the two-phase of the normal open diode element 13 that is connected in parallel, form the circuit structure of the current path under the state that the side switch element of guaranteeing in a specific phase of carrying out the on/off action disconnects, the switch element of downside is connected.When the side switch element disconnection of U phase, side switch element switches, be that electrolytic capacitor flows out electric current I c as the electric current that flows out from electrolytic capacitor 5, press the side switch element → V of U phase, the such path flow of side switch element of downside diode element → motor 8 → U phase of W phase.Here, when the electric current that the electric current that it is Iu at the electric current that flows to the U phase that electrolytic capacitor flows out electric current I c, flow to the V phase is Iv, flow to the W phase is Iw, be Ic=Iu=Iv+Iw.
In addition, electrolytic capacitor electrostatic capacitance calculator 10c according to the both end voltage amount of pressure drop Δ V of Ton turn-on time of the side switch element of the switch element of a specific phase of carrying out on/off action, electrolytic capacitor 5 with flow to U electric current I u (=electrolytic capacitor flows out electric current I c) mutually, and calculate the electrostatic capacitance C of electrolytic capacitor 5.
According to Fig. 3, the processing of calculating the electrostatic capacitance of electrolytic capacitor in the convertor device of 4,5 explanation embodiments of the present invention 3.
When source power supply interrupts, make the switch element of inverter main circuit 7c carry out above-mentioned on/off action, the discharge of beginning electrolytic capacitor 5.
Fig. 4 is illustrated in makes mutually side switch element normal off of V phase and W, make side switch element normal open, only the switch element of U phase is carried out in the situation of on/off action, the side switch element switches of U phase, the electrolytic capacitor when the side switch element disconnects flow out the path of electric current I c, press side switch element → motor 8 → V of electrolytic capacitor 5 → U phase, the side switch element of W phase (to V phase and W mutually equalization flow through) → path flow of electrolytic capacitor 5.
In addition, as shown in Figure 5, flow out electric current I c owing to flowing through electrolytic capacitor during the Ton in the turn-on time of the side switch element switches of U phase, so the charge discharge of electrolytic capacitor 5, the detected U phase current of current detector 12c Iu will increase.On the other hand, disconnect at the side switch element of U phase, in the time (Ts-Ton) of the turn-on time in the carrier cycle Ts during the side switch element switches of U phase beyond the Ton, the electric charge of electrolytic capacitor 5 does not discharge, and U phase current Iu reduces.Therefore, only in turn-on time of obtaining according to going code of side switch element from from ON-OFF control circuit 6c to U phase output the Ton, the electric charge that is stored in electrolytic capacitor 5 is discharged, the discharge time=turn-on time Ton.
Then, in electrolytic capacitor electrostatic capacitance calculator 10c, will be multiplied each other and integration by the detected U phase current of current detector 12c Iu and discharge time (=according to from ON-OFF control circuit 6c to U mutually Ton turn-on time that goes code and obtain of side switch element output).And according to the voltage Vdc by the detected electrolytic capacitor 5 of voltage detector 11a, the electrolytic capacitor voltage in the electrolytic capacitor voltage of obtaining when beginning discharge and the discharge poor obtained the discharge voltage Δ V as amount of pressure drop.
Utilize formula (6), can be according to discharge charge and the discharge voltage Δ V of electrolytic capacitor 5, obtain the electrostatic capacitance C of electrolytic capacitor 5, wherein the discharge charge of above-mentioned electrolytic capacitor 5 is with according to Ton turn-on time that goes code and obtain that outputs to the side switch element of above-mentioned U phase, U phase current Iu is carried out integration obtain.
Electrostatic capacitance C=∫ (Iu * Ton)/Δ V ... .. (6)
In the above-mentioned explanation, be only to make U carry out mutually the on/off action, then making mutually side switch element normal off with W, make side switch element normal open for the V phase is that example is narrated, and is that V phase or W also can obtain effect same mutually mutually but carry out specific 1 of on/off action.In this situation, current detector 12c is arranged on the V phase or W goes up mutually.
Structure and the processing of the convertor device of embodiment of the present invention 4 are described according to Fig. 6.Among Fig. 6,5,6c, 8,11a, 13 identical with Fig. 3, the description thereof will be omitted.Between the side switch element of inverter main circuit 7d and the electrolytic capacitor 5 current detector 12d is set.
In addition, electrolytic capacitor electrostatic capacitance calculator 10d flows out electric current I c according to Ton turn-on time of the side switch element of the switch element of a specific phase of carrying out the on/off action, both end voltage amount of pressure drop Δ V and the electrolytic capacitor of electrolytic capacitor 5, calculates the electrostatic capacitance C of electrolytic capacitor 5.
According to Fig. 6, the processing of calculating the electrostatic capacitance of electrolytic capacitor in the convertor device of 7 explanation embodiments of the present invention 4.
When source power supply interrupts, make the switch element of inverter main circuit 7d carry out above-mentioned on/off action, electrolytic capacitor 5 begins discharge.
Fig. 7 is illustrated in makes mutually side switch element normal off of V phase and W, make side switch element normal open, only the switch element of U phase carried out in the situation of on/off action, the side switch element switches of U phase, the electrolytic capacitor when the side switch element disconnects flow out the path of electric current I c, press side switch element → motor 8 → V of electrolytic capacitor 5 → U phase, the side switch element of W phase (to V phase and W mutually equalization flow through) → path flow of electrolytic capacitor 5.Here, be Iu when electrolytic capacitor flows out electric current I c at the electric current that flows to the U phase, the electric current that flows to the V phase is Iv, when the electric current that flows to the W phase is Iw, be Ic=Iu=Iv+Iw.
Electrolytic capacitor electrostatic capacitance calculator 10d flows out the detected electrolytic capacitor of current detector 12d electric current I c and discharge time (=according to from ON-OFF control circuit 6c to U mutually Ton turn-on time that goes code and obtain of side switch element output) and multiplies each other and integration.In addition, electrolytic capacitor electrostatic capacitance calculator 10d utilizes formula (7), flow out electric current I c according to Ton turn-on time of the side switch element of the switch element of a specific phase of carrying out on/off action, both end voltage amount of pressure drop Δ V and the electrolytic capacitor of electrolytic capacitor 5, calculate the electrostatic capacitance C of electrolytic capacitor 5.
Electrostatic capacitance C=∫ (Ic * Ton)/Δ V .... (7)
The formula (7) of calculating the electrostatic capacitance C of above-mentioned electrolytic capacitor 5 is replaced into electrolytic capacitor to the U phase current Iu of the formula (6) of calculating the electrostatic capacitance C of electrolytic capacitor 5 in the execution mode 3 and flows out electric current I c.
In the execution mode 3, when source power supply interrupts, the outlet side that carries out a specific phase (the U phase of Fig. 3) of on/off action arranges current detector 12c, carry out on/off action, then make mutually side switch element normal off with W, make in the situation of side switch element normal open for the V phase being controlled to be the switch element that only makes the U phase, because electrolytic capacitor flows out the electric current I u that electric current I c=flows to the U phase, the alternative electrolytic capacitor of electric current I u that therefore flows to the U phase flows out electric current I c to be used.
As shown in Figure 3, detect in the method for the electric current (=electrolytic capacitor flows out electric current I c) that uses in the calculating of electrolytic capacitor electrostatic capacitance at the current detector 12c by the setting of converter outlet side, in the current potential situation about equating of control circuit power supply (not shown) and some A, need insulation, therefore need to use the insulated type current detector.
In the execution mode 4, between the side switch element of electrolytic capacitor 5 and inverter main circuit 7d current detector 12d is set, therefore even if in control circuit power supply and situation that the current potential of some A equates, current detector also can be non-insulated type, for example can use the bypass resistance of cheapness.
Be detect current detector 12d that electrolytic capacitor flows out electric current I c and carried out narration as example between the side switch element of electrolytic capacitor 5 and inverter main circuit 7d, to arrange in the above-mentioned explanation, also can obtain same effect yet between U phase side switch element and V phase side switch element, current detector is set.
The ON-OFF control circuit of the convertor device of embodiment of the present invention 5 is described according to Fig. 8.
In the ON-OFF control circuit 14 of the convertor device of execution mode 5, the switch element of inverter main circuit (not shown) is carried out the ON-OFF control circuit 6 (6a of the control signal of on/off control in output, input side 6c), the comparator 15 that current instruction value i* and current detection value i are compared and the current controller 16 that is used for preventing overcurrent are set, form current loop.Therefore when load is moved, in the vicissitudinous situation of the inductance of winding, can control and not produce overcurrent, thereby can correctly calculate the electrostatic capacitance of electrolytic capacitor.
Structure and the processing of the convertor device of embodiment of the present invention 6 are described according to Fig. 9.Among Fig. 9,2～5,6a, 7a, 8,10a, 11a, 12a be identical with Fig. 1, the description thereof will be omitted.
Among the convertor device 1e of execution mode 6, when abnormal signal output circuit 17 is lower than the first electrostatic capacitance License Value in the electrostatic capacitance of the electrolytic capacitor 5 of being calculated by electrolytic capacitor electrostatic capacitance calculator 10a, with the output abnormality signal.In addition, abnormal signal output circuit 17 is lower than than the first electrostatic capacitance License Value also during large the second electrostatic capacitance License Value in the electrostatic capacitance of electrolytic capacitor 5, then the output signal of giving advance notice.
In the convertor device 1e of execution mode 6 since when the electrostatic capacitance of electrolytic capacitor 5 is lower than the first electrostatic capacitance License Value the output abnormality signal, the user judges that easily electrolytic capacitor changes period.In addition, arrange than judging also large the second electrostatic capacitance License Value of the first electrostatic capacitance License Value that electrolytic capacitor is changed period, when being lower than the second electrostatic capacitance License Value, the electrostatic capacitance of electrolytic capacitor 5 exports the signal of giving advance notice, therefore the user can judge and change period near electrolytic capacitor, more change jobs thereby prepare electrolytic capacitor, the dwell time of the convertor device in the time of therefore electrolytic capacitor can being changed is suppressed to Min..
That example take motor 8 as load is illustrated in the above-mentioned execution mode 1～6, even if but load is the inductive load of inductive heater, ozone generator etc., can obtain equally the electrostatic capacitance of electrolytic capacitor 5, carry out correct life prediction.
Utilizability on the industry
As mentioned above, convertor device of the present invention can be judged the life-span of electrolytic capacitor accurately, therefore can accurately judge the replacing period of electrolytic capacitor, be suitable for the convertor device that is difficult to the place the electrolytic capacitor life-span measured from the outside as being configured in.
Claims (7)
1. a convertor device has: as the electrolytic capacitor of DC power supply; Inverter main circuit with switch element is alternating voltage with the dc voltage conversion of this electrolytic capacitor; ON-OFF control circuit, output are carried out the control signal of on/off control to the switch element of this inverter main circuit; And electrolytic capacitor electrostatic capacitance calculator, calculate the electrostatic capacitance of above-mentioned electrolytic capacitor, it is characterized in that:
When interrupting being connected to the power supply of above-mentioned electrolytic capacitor, above-mentioned ON-OFF control circuit makes the specific phase in the above-mentioned inverter main circuit by output upper brachium pontis switch element and lower brachium pontis switch element carry out on/off action, other mutually upper brachium pontis switch element normal off, the control signal of lower brachium pontis switch element normal open, make electric current flow through external loading, thereby make the charge discharge of above-mentioned electrolytic capacitor, simultaneously
Above-mentioned electrolytic capacitor electrostatic capacitance calculator is calculated the electrostatic capacitance of above-mentioned electrolytic capacitor according to from the electric current that flowed out by above-mentioned electrolytic capacitor and the discharge charge amount of obtaining turn-on time of carrying out the on/off action and as the discharge voltage of the amount of pressure drop after the discharge beginning of above-mentioned electrolytic capacitor.
2. convertor device according to claim 1,
Above-mentioned ON-OFF control circuit arranges comparator and current controller at input side,
Described comparator is to comparing at the electric current that flows out from above-mentioned electrolytic capacitor that generates that the current instruction value that uses when on/off is controlled the control signal of switch element of above-mentioned inverter main circuit and above-mentioned electrolytic capacitor electrostatic capacitance calculator use or the electric current suitable with the electric current that flows out from above-mentioned electrolytic capacitor
Described current controller is for the overcurrent of the outlet side that prevents this comparator.
3. convertor device according to claim 2,
Comprise the abnormal signal output circuit, when the electrostatic capacitance of the electrolytic capacitor of being calculated by above-mentioned electrolytic capacitor electrostatic capacitance calculator is lower than predefined the first electrostatic capacitance License Value, the output abnormality signal.
4. convertor device according to claim 1,
Comprise the abnormal signal output circuit, when the electrostatic capacitance of the electrolytic capacitor of being calculated by above-mentioned electrolytic capacitor electrostatic capacitance calculator is lower than predefined the first electrostatic capacitance License Value, the output abnormality signal.
5. convertor device according to claim 3,
Above-mentioned abnormal signal output circuit can be set the second electrostatic capacitance License Value larger than above-mentioned the first electrostatic capacitance License Value, simultaneously when the electrostatic capacitance of the electrolytic capacitor of being calculated by above-mentioned electrolytic capacitor electrostatic capacitance calculator is low than this second electrostatic capacitance License Value, export the signal of giving advance notice.
6. convertor device according to claim 4,
Above-mentioned abnormal signal output circuit can be set the second electrostatic capacitance License Value larger than above-mentioned the first electrostatic capacitance License Value, simultaneously when the electrostatic capacitance of the electrolytic capacitor of being calculated by above-mentioned electrolytic capacitor electrostatic capacitance calculator is low than this second electrostatic capacitance License Value, export the signal of giving advance notice.
7. electrostatic capacitance detection method, it is used for convertor device claimed in claim 1,
When interrupting being connected to the power supply of above-mentioned electrolytic capacitor, make the charge discharge of above-mentioned electrolytic capacitor, simultaneously, according to the discharge charge amount of being obtained by discharging current and discharge time and as the discharge voltage of the amount of pressure drop after discharge beginning of above-mentioned electrolytic capacitor, utilize following calculating formula
Electrostatic capacitance=discharge charge amount/discharge voltage
And calculate the electrostatic capacitance of above-mentioned electrolytic capacitor.
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| CN038112922A Division CN1653678B (en) | 2003-03-17 | 2003-03-17 | Inverter apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US9134744B2 (en) * | 2013-01-04 | 2015-09-15 | Linear Technology Corporation | Low current DC-DC converter with integrated low current Coulomb counter |
| CN104601002B (en) * | 2014-12-29 | 2017-06-30 | 南京航空航天大学 | A kind of sparse formula dual stage matrix converter topological structure |
| JP6227581B2 (en) * | 2015-03-20 | 2017-11-08 | ファナック株式会社 | Motor drive apparatus having means for determining DC capacitor life |
| TWI686042B (en) * | 2018-12-07 | 2020-02-21 | 群光電能科技股份有限公司 | Power conversion device |
| JP7311380B2 (en) * | 2019-10-01 | 2023-07-19 | 株式会社日立産機システム | Power supply capacitor capacitance measurement device and power supply capacitor capacitance measurement method |
| JP7008770B1 (en) * | 2020-09-10 | 2022-01-25 | 三菱電機株式会社 | Motor drive system |
| CN112636619B (en) * | 2020-11-24 | 2022-04-05 | 联合汽车电子有限公司 | Inverter bus current calculation method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5148043A (en) * | 1989-07-25 | 1992-09-15 | Kabushiki Kaisha Toshiba | Uninterruptible power supply diagnosing remaining battery capacity during normal external power source operation |
| CN1177233A (en) * | 1996-09-06 | 1998-03-25 | 三菱电机株式会社 | Pulased power supply unit |
-
2003
- 2003-03-17 CN CN 200910147248 patent/CN101714825B/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5148043A (en) * | 1989-07-25 | 1992-09-15 | Kabushiki Kaisha Toshiba | Uninterruptible power supply diagnosing remaining battery capacity during normal external power source operation |
| CN1177233A (en) * | 1996-09-06 | 1998-03-25 | 三菱电机株式会社 | Pulased power supply unit |
Non-Patent Citations (3)
| Title |
|---|
| JP特开平11-231008A 1999.08.27 |
| JP特开平11-89264A 1999.03.30 |
| JP特开平11-98854A 1999.04.09 |
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