JP2008092746A - Capacitor charging device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To sequentially correct a coarse charging voltage of a capacitor to an appropriate value during operating a charging device or even in the case of fluctuations in a capacitance C or a reactor value L due to the operating ratio of the device. <P>SOLUTION: The voltage control circuit 8 of a DC chopper type quick charging circuit calculates the changes of quick charging voltage by the capacity fluctuations of the capacitor 7 from the measured temperature value of the capacitor itself or the ambient measured temperature value to correct the fluctuations of the calculated capacitance C by control of output current i. This includes application to an LC resonance type quick charging circuit. The changes of the quick charging voltage due to the capacity fluctuations of the capacitor or the reactor value fluctuations of a reactor installed with the quick charging circuit are obtained by an arithmetic operation of which arithmetical elements are temperature, a circuit constant, voltage, current, and an operation period, thereby controlling the output current and the target voltage of the quick charging circuit from the arithmetic result. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a capacitor charging device that repeatedly charges a capacitor to a set voltage with high accuracy in a pulse power source that uses a power capacitor as a DC power source to generate a pulse of high voltage and large current.

  Applications of this type of pulse power supply include excimer lasers and ozonizers, and particularly high accuracy is required for the charging voltage setting value (for example, accuracy of 0.1% or less). The charging device charges the load capacitor to a voltage given by the charging voltage command value within a predetermined time. This operation is repeated 4000 times per second, for example.

  FIG. 7 shows an example of a conventional charging circuit. In order to obtain high-speed and high-precision charging accuracy with respect to the charging voltage command value, a quick charging period and a fine adjustment period are provided in one charging period. The load capacitor is rapidly charged to a voltage (target voltage) that is several percent lower than the command value, and then additionally charged to the voltage command value V * in the fine adjustment period. In this additional charging, it is difficult to perform high-accuracy charging with respect to the command value only by the quick charging circuit, so the high-accuracy charging is realized by charging the load capacitor slightly low in the quick charging circuit and by additional charging of the fine adjustment circuit ( For example, see Patent Document 1). The circuit configuration and operation will be described below (see FIG. 8 for waveforms).

<Operation during the quick charge period>
In FIG. 7, the quick charging circuit is configured as a DC chopper type using a DC power source 1 as a power source and a semiconductor switch 2, a reactor 3, a semiconductor switch 4 and flywheel diodes 5, 6. Charge.

  The voltage control circuit 8 first turns on the switch 2 and the switch 4 at the same time, passes a current through the path of the arrow A, and accumulates energy in the reactor 3. Next, the switch 2 and the switch 4 are simultaneously turned off, and a current is passed through the circuit along the path indicated by the arrow B to transfer all the energy stored in the reactor 3 to the capacitor 7, thereby charging the capacitor 7. The charging voltage at this time is a value obtained by multiplying the charging voltage command by a coefficient (gain G: 1 or less) of the coefficient circuit 9 as a voltage command value of the control circuit 8, and is calculated by the control circuit 8 based on this voltage command value. As a result, the OFF timing of the switches 2 and 4 is obtained.

  In this calculation, the reactor value of the reactor 3 is L, the capacitor capacity of the capacitor 7 is C, the current when the switch 2 and the switch 4 are turned off (arrow A) is I, and the capacitor 7 when the current of the arrow B finishes flowing. If V is V (hereinafter referred to as coarse charge voltage), the law of conservation of energy

Holds. In the quick charge, the capacitor 7 is charged to the target voltage (a voltage that is several percent lower than the command value) V based on the above equation. That is, the current i of the reactor 3 is always detected, and the following equation:

When the above is established, the switch 2 and the switch 4 are turned off.

<Operation during the fine adjustment period>
In FIG. 7, the fine adjustment charging circuit obtains an AC voltage by an inverter 10 using a DC power source 1 as a power source, boosts this voltage by a pulse transformer 11, and includes a rectifier circuit 12, a DC reactor 13, a semiconductor switch 14, and a diode 15. The fine adjustment charging current of the capacitor 7 is output by the constant current circuit. The constant current charging circuit 16 always keeps the switch 14 turned on, and the operation of the inverter 10 causes a current (a constant direct current) set by a constant current command to flow through the path of the rectifier circuit 12, the reactor 13, and the switch 14. Keep it. Next, the switch 14 is turned off, the charging current continues to flow through the capacitor 7, and the capacitor 7 is finely charged.

  In this fine adjustment period control, the charging voltage command value V * and the voltage of the capacitor 7 are always compared by the comparator 17, and the switch 14 is turned off until the voltage of the capacitor 7 matches the set value V *.

  FIG. 9 shows another example of the charging circuit, and a different part from FIG. 7 is a case where the quick charging circuit is supplied as the LC oscillation current (see, for example, Patent Document 2). This LC resonance type quick charging circuit is composed of an inverter-structured pulse generation circuit 18, a pulse transformer 19, a rectifier circuit 20 and a reactor 21, and the voltage control circuit 8 alternately applies positive and negative polarity pulses to the pulse generation circuit 18. Each time the pulse is generated, a half-cycle oscillating current is passed through the capacitor 21 through the reactor 21, and the capacitor 7 is charged to the target voltage every time one pulse is generated (see FIG. 10 for waveforms). This charging circuit is equivalently configured by replacing the pulse generation circuit 18, the pulse transformer 19, and the rectification circuit 20 with the switch 2 and the diode 5 of FIG. 7 and omitting the diode 6 and the switch 4.

In this LC resonance type charging voltage control, the pulse generation period is controlled while detecting the voltage Vc of the capacitor 7. That is, assuming that the current when one pulse voltage is generated from the pulse generation circuit 18 is I, the charging voltage of the capacitor 7 is V ₀ , and the voltage of the capacitor 7 when the pulse is stopped is V, the following is given from the law of energy conservation. Expression (1-1) is established. In order to charge the capacitor 7 to the target voltage V from this equation, the voltage control circuit 8 calculates the following equation (2-1) for the charging current i, and when this equation holds, the pulse of the pulse generation circuit 18 Stop generating operation.

  In the capacitor charging device using the rapid charging and fine adjustment charging as described above, the capacitance of the capacitor 7 varies due to the change of the internal temperature due to the change of the ambient temperature and the operating rate of the device, and the reactor value of the reactor 3 is also the surroundings. The coarse charge voltage may vary from the command value V (a value obtained by multiplying V * by the gain G) in some cases due to a change in temperature or the operating rate of the apparatus.

  For example, when the equation (1) is modified,

Therefore, when the capacitance of the capacitor 7 varies from C to C ′, the coarse charge voltage is

When the reactor value of reactor 3 fluctuates from L to L ′, the coarse charge voltage is

Fluctuates.

  Further, when the above equation (1-1) is modified,

Therefore, when the capacitance of the capacitor 7 varies from C to C ′, the coarse charge voltage is

When the reactor value of reactor 3 fluctuates from L to L ′, the coarse charge voltage is

Fluctuates.

  Therefore, when the capacitance of the capacitor 7 decreases due to a temperature change or the like, from the equation (4-1) and the equation (4-3), when the reactor value of the reactor 3 increases, the equation (4-2) From equation (4-4), the coarse charge voltage increases, the coarse charge voltage exceeds the set value V * (see a in FIG. 11), and fine adjustment by the fine adjustment charging circuit cannot be performed. As a result, the charging accuracy is improved. Getting worse.

  On the contrary, when the capacitance of the capacitor 7 is increased, from the equations (4-1) and (4-3), when the reactor value of the reactor 3 is similarly decreased, the equations (4-2) and (4) -4) The coarse charging voltage is reduced (see b in FIG. 11), and the following inconvenience occurs.

  -It is necessary to increase the margin of the charging current capacity of the fine adjustment charging circuit, leading to an increase in the size of the device.

  The coarse charge voltage drops, and there are cases where additional charge cannot be fully achieved up to the set value V * within the fine adjustment period determined by the charge repetition cycle.

  If the fine adjustment charging current is increased for the purpose of preventing these inconveniences, the fine adjustment charging voltage dV / dt increases and the charging accuracy deteriorates.

The above-described fluctuation of the capacitor capacity C and the fluctuation of the reactor value L are caused not only by these temperature changes but also by changes in circuit constants due to replacement of unit units or replacement of circuit elements. As a countermeasure in this case, Patent Document 2 compensates for a change in pulse current energy by changing a value of an operation constant of the voltage control circuit.
Japanese Patent Laying-Open No. 2005-086970 JP 2005-108910 A

  The method of Patent Document 2 described above compensates for fluctuations in the capacitor capacity C and the reactor value L of the charging device by changing the input setting values of the circuit constants. The constant will be changed.

  For this reason, compensation cannot be made if the capacitance or reactor value fluctuates due to a change in ambient temperature during operation of the charging device or a temperature change due to the operating rate of the device. In other words, it is not possible to compensate for fluctuations in capacitance and reactor value due to the operation of the charging device and the operating rate of the device.

  An object of the present invention is to provide a capacitor charging device that can sequentially correct the coarse charging voltage of the capacitor to an appropriate value even when the capacitor capacity C or the reactor value L varies due to the operation of the charging device or the operating rate of the device. is there.

  In order to solve the above-described problems, the present invention provides a capacitor charging device including a DC chopper type or LC resonance type quick charging circuit and a fine adjustment charging circuit. The change of the quick charge voltage due to the value fluctuation is obtained by calculation using the temperature, circuit constant, voltage, current, and operation period as calculation elements, and the output current and target voltage of the quick charge circuit are controlled from the calculation result. It is characterized by the following configuration.

(1) A DC chopper type quick charging circuit that rapidly charges a capacitor to a target voltage close to the charging voltage command value by the output of the DC chopper circuit, and charging the capacitor to a charging voltage command value by constant current charging after the rapid charging. In a capacitor charging device with a fine adjustment charging circuit,
The voltage control circuit of the quick charge circuit includes control means for correcting a change in the quick charge voltage due to a change in capacitance of the capacitor or a change in reactor value of the reactor of the quick charge circuit.

(2) An LC resonance type quick charging circuit that rapidly charges the capacitor to a target voltage close to a charging voltage command value by flowing an oscillating current through the DC voltage reactor to the capacitor, and a constant current after the rapid charging. In a capacitor charging device with a fine adjustment charging circuit that charges up to a charging voltage command value by charging,
The voltage control circuit of the quick charge circuit includes control means for correcting a change in the quick charge voltage due to a change in capacitance of the capacitor or a change in reactor value of the reactor of the quick charge circuit.

  (3) The control means calculates the capacitor capacity C or the reactor value L from the temperature measurement value of the capacitor itself or the reactor itself, or the temperature measurement value around the quick charging circuit, and calculates the calculated capacitor capacity C or reactor. A change in the rapid charging voltage due to the fluctuation of the value L is corrected by the output current control of the rapid charging circuit.

  (4) The control means calculates the capacitor capacity C ′ from the measurement results of the coarse charge voltage V1, fine adjustment voltage V2, fine adjustment current I, and fine adjustment charge time T of the capacitor, and the calculated capacitor capacity C The change in the quick charge voltage due to the fluctuation of 'is corrected by the output current control of the quick charge circuit.

  (5) The control means calculates the capacitor capacitance C ′ from the measurement result of the fine adjustment voltage V2, the fine adjustment current I, the fine adjustment charging time T, and the rough charge voltage V1 ′ predicted from these measurement results. A change in the quick charge voltage due to the fluctuation of the calculated capacitor capacity C ′ is corrected by output current control of the quick charge circuit or by control of the target voltage V.

  (6) The control means calculates a reactor value L ′ of the reactor from a time T2 during which a current flows through the reactor, a current I2 at that time, and a DC power supply voltage E of the DC chopper circuit, and the calculated reactor value The quick charge voltage change due to the variation of L ′ is corrected by the output current control of the quick charge circuit.

  (7) When the fine adjustment charging time T exceeds a preset time T2, the control means determines the fine adjustment current I, the measurement result of the fine adjustment charging time T, the capacitor capacity C, and the charging voltage command value V *. The target voltage V after the next time is switched at a ratio obtained from the following, and charging is performed up to the charging voltage command value V * within the fine adjustment charging period.

(8) The control means calculates the fluctuation of the capacitor capacity C or the reactor value L in advance, and immediately before the start of the quick charge, the calculated capacity C, the reactor value L, and the DC power supply voltage E of the quick charge circuit. And the target voltage V is used to control the on-period T _ON of the quick charge circuit to correct the change in the quick charge voltage.

  (9) The control means calculates the reactor value L ′ of the reactor from the capacitance C of the capacitor, the time T2 during which the current flows to the reactor, the current I2 at that time and the DC power supply voltage E of the quick charging circuit. The change in the rapid charging voltage due to the fluctuation of the calculated reactor value L ′ is corrected by the output current control of the rapid charging circuit.

(10) wherein, said capacitance C, the reactor value L and rapidly by controlling the ON period T _ON of the rapid charging circuit quick charge immediately before the start of the DC power supply voltage E and the charge voltage command value V * It is characterized by correcting a change in charging voltage.

  As described above, according to the present invention, in the capacitor charging device using the DC chopper type or LC resonance type quick charging circuit and the fine adjustment charging circuit, the capacity fluctuation of the load capacitor or the reactor value fluctuation of the reactor of the quick charging circuit In order to control the output current and target voltage of the quick charging circuit based on the calculation result of the temperature, circuit constant, voltage, current, and operation period as the calculation elements, The fluctuation of the capacitor capacity C or the reactor value L due to the time or the operating rate of the apparatus also has an effect that the coarse charging voltage of the capacitor can be corrected to an appropriate value successively.

(Embodiment 1)
FIG. 1 is a configuration diagram of a main part of the charging apparatus according to the present embodiment, and a different part from FIG. 7 is that a quick charge calculation by the voltage control circuit 8 is corrected for a capacitance variation of the capacitor 7 due to temperature.

  Since the capacitance C of the capacitor 7 can be estimated by measuring its internal temperature, the internal temperature of the capacitor 7 is measured by the temperature detector 31 immediately before the start of charging, and the temperature correction circuit 32 is calculated from this temperature measurement value. And the voltage control circuit 8 substitutes the calculated capacitance C ′ of the capacitor 7 as a variable into the above-described equation (2), thereby setting the capacitor 7 to the target voltage V. The current i required for charging up to 2 is obtained, and when this current i is reached, the switches 2 and 4 are turned off.

  Therefore, even when the capacitance of the capacitor 7 fluctuates due to a change in the ambient temperature or the operating rate of the apparatus, the coarse charging voltage of the capacitor 7 can be sequentially corrected to improve the charging accuracy. Can be eliminated.

  Note that the temperature correction is not limited to when the operation of the charging device is started, and the coarse charging accuracy can be further improved by correcting the temperature every fixed number of charging operations. Further, the temperature correction circuit 32 may be configured as a function calculation circuit of temperature-capacitance characteristics or a configuration in which a function is converted into table data. Further, the temperature detector 31 is not limited to directly measuring the temperature of the capacitor 7 but can also be estimated from the ambient temperature measurement of the charging device.

  Further, the temperature correction can be similarly performed for the reactor value of the reactor 3 in addition to the capacitance of the capacitor 7. In this case, a circuit for correcting the reactor value equivalent to the temperature correction circuit 32 may be added.

(Embodiment 2)
FIG. 2 is a configuration diagram of the main part of the charging apparatus according to the present embodiment. The parts different from FIG. 7 are the quick charge calculation performed by the voltage control circuit 8 and the coarse charge voltage V1, fine adjustment voltage V2, and fine adjustment of the capacitor 7. From the measurement result of the current I and the fine adjustment charging time (off time of the switch 26) T, the fluctuation of the capacitance of the capacitor 7 is calculated, and the calculated capacitance C ′ of the capacitor 7 is used as in the first embodiment. Similarly, by substituting into the equation (2), a current i required to charge the capacitor 7 to the target voltage V is obtained, and when this current i is reached, the switches 2 and 4 are controlled to be turned off. .

  The capacitance C of the capacitor 7 at the time of the previous charging is calculated by the following arithmetic expression, where T is the off time of the switch 26, V1 is the coarse charge voltage, V2 is the fine adjustment voltage, and I is the fine adjustment current value.

  The voltage control circuit 8 performs a calculation by substituting the capacitance C calculated based on the equation (6) into the capacitance C ′ of the equation (2), and when the detected current i matches the calculation result. The switches 2 and 4 are turned off.

  Therefore, even when the capacitance of the capacitor 7 fluctuates due to a change in the ambient temperature or the operating rate of the apparatus, the coarse charging voltage of the capacitor 7 can be sequentially corrected to improve the charging accuracy. Can be eliminated.

  The capacitance correction does not need to be calculated for each charging operation, and may be corrected for each certain number of charging operations.

(Embodiment 3)
FIG. 3 is a configuration diagram of a main part of the charging apparatus according to the present embodiment. A portion different from FIG. 2 is a fine adjustment charging time without measuring the rough charging voltage V1 in the quick charging calculation by the voltage control circuit 8. The rough charge voltage V1 is estimated from the (off time of the switch 26), and an error from the target value V is reflected in the next set value.

  The estimated value V1 'of the rough charge voltage at the previous charge is T from the switch 26 off time and V * from the charge voltage command 16 (command value).

Can be obtained as

  The command value V of the coarse charging voltage input to the voltage control circuit 8 is a value obtained by multiplying the charging voltage command V * by the coefficient (gain G) of the coefficient circuit 9, so that the value of the gain G is expressed by the equation (7). The next rough charging voltage can be controlled by changing the estimated value V1 ′ obtained in (1).

  Gain G

  However, g is a variable, for example, the initial value is 1, for example, G0 is the value (initial value) of the gain G before the change, and is a value for charging the capacitor 7 by ΔV lower than the charge voltage command value V *. It becomes the relation of the expression of.

  Next, assuming that the target voltage V at the time of previous charging and the value of the variable g at the time of charging is g1, the value g2 of the variable g used at the next charging is obtained from the following equation (8-2):

  The gain G used at the next charging is obtained from the following equation (8-3), and this is set as the value of the gain G at the next charging.

  In a system in which a rough charging target voltage V of V * −ΔV = V * ′ is set and inputted in advance, G0 = 1 and the following equation (8-4) is used.

  The calculation according to the present embodiment will be described with a specific example. The actual coarse charge voltage value is V1 ′ last time with respect to the input value V * × G0 × g1 of the voltage control circuit 8, and the next charge voltage command V * is the same. In this case, the input value of the voltage control circuit 8 is

Therefore, the rough charge voltage value is

Thus, the rough charge voltage can be controlled to the target voltage V. However, since the capacitance C of the capacitor 7 is a fixed constant, an error occurs.

  Therefore, in the present embodiment, the detection of the coarse charge voltage V1 is not required, and the coarse charge voltage of the capacitor 7 is changed even when the capacitance of the capacitor 7 fluctuates due to a change in ambient temperature or the operating rate of the apparatus. Correction can be made sequentially to improve charging accuracy, and the above-mentioned problems can be solved.

(Embodiment 4)
FIG. 4 is a configuration diagram of a main part of the charging apparatus according to the present embodiment. A portion different from FIG. 7 is a quick charging operation performed by the voltage control circuit 8 to correct fluctuations in the reactor value L of the reactor 3 and to perform a quick charging voltage. The point is to control.

  The voltage control circuit 8 calculates the reactor value of the reactor 3 from the ON time of the switch 2 and the switch 4 and the detected current at that time, and substitutes the calculated reactor value of the reactor 3 into the equation (2) as a variable. Thus, the current i necessary to charge the capacitor 7 to the target voltage V is obtained, and when this current i is reached, the switches 2 and 4 are controlled to be turned off.

When the on time of the switch 2 and the switch 4 is T2, the current value of the reactor 3 at that time is I2, and the DC voltage is E (= V _DC ), the reactor value L of the reactor 3 is obtained from the following equation (9). Can do.

  Therefore, even when the reactor value L of the reactor 3 fluctuates due to a change in the ambient temperature or the operating rate of the apparatus, the charging accuracy can be improved by sequentially correcting the coarse charging voltage of the capacitor 7, and the above-described problem Can be eliminated.

(Embodiment 5)
FIG. 5 is a configuration diagram of a main part of the charging apparatus according to the present embodiment. A different part from FIG. 3 is that the gain G in the multiplier circuit 9 is switched in a stepped manner for the quick charge calculation by the voltage control circuit 8.

  When the time T (off time of the switch 26) at the previous fine adjustment charging exceeds the required time, the voltage control circuit 8 gains the gain G of the multiplier 9 for setting the rough charging target voltage used for the subsequent charging. Is changed stepwise to control the charging voltage of the capacitor 7.

  The fine adjustment charging time (off time of the switch 26) T is obtained from the above equation (6), but the actual fine adjustment charging time longer than this time T means that the coarse charging voltage has decreased. As described above, there arises a problem that additional charging cannot be performed up to the set value V * within the fine adjustment period determined by the repetition cycle of charging.

  Therefore, when an appropriate time T2 shorter than the required fine adjustment charging time T is set and the off time T of the switch 26 exceeds T2, the gain G used for the next time is changed to the equation (8-3). Then, the value is switched to a value multiplied by a coefficient (ratio) obtained according to the following equation (10).

And However, the gain G up to the previous time is set to G0 × g1.

  Therefore, in the present embodiment, in order to correct the fluctuation of the capacitor capacitance C or the fluctuation of the reactor value L, only the gain G is switched, and the charging voltage command value is within the fine adjustment charging period required from the charging repetition cycle. Can charge up to V *. Thereby, compared with the case where the fluctuation | variation of C and L by Embodiment 3 etc. is calculated | required by calculation, the gain G by Formula (8-3) can be calculated | required previously, and the calculation of the gain G is carried out in the voltage control circuit 8. It becomes unnecessary.

(Embodiment 6)
FIG. 6 is a main part configuration diagram of the charging apparatus according to the present embodiment. In the first to fifth embodiments described above, the control of the quick charge period is to perform the calculation of the above formula (2) in real time while detecting the current i, but the voltage V of the DC power supply 1 immediately before the start of the quick charge. _{If DC} is detected, the ON time T _ON of the switch 2 and the switch 4 necessary for charging up to the target voltage V can be calculated in advance. For example, if the value of the DC voltage V _DC is E,

Therefore, substituting into the above equation (1),

Can be calculated.

Therefore, the voltage control circuit 8 controls the switches 2 and 4 to be turned off at the time T _ON calculated by the above equation (11), and the fluctuation of the capacitor capacity C or the reactor value L used for the calculation of the time T _ON is described above. It is set as the structure corrected by the calculation in the first to fifth embodiments. This eliminates the need for quick charge voltage correction by detecting the reactor current i.

(Embodiment 7)
The present embodiment is a case where the same rapid charging control as in the first to sixth embodiments is applied to the LC resonance type rapid charging circuit shown in FIG.

  Specifically, the adjustment or switching of the gain G in the third or fifth embodiment can be applied as it is to the LC resonance type quick charging circuit of FIG. Further, in place of the calculation of the current i by the equation (2), if the equation (2-1) type suitable for the LC resonance type quick charging circuit is used, the same as in the first to fifth embodiments. Can be corrected.

  Further, if Equation (9) is changed to a form suitable for an LC resonance type quick charging circuit, it can be corrected in the same manner as in the fourth embodiment (FIG. 4). In this case, assuming that the capacitance C of the capacitor 7, the pulse generation time of the pulse generation circuit 18 is T2, the current value of the reactor 21 at that time is I2, and the DC voltage boosted by the pulse transformer 19 is E, the value of the reactor 21 L can be obtained from the following equation (9-1).

Further, if Equation (11) is changed to a form suitable for an LC resonance type quick charging circuit, it can be corrected in the same manner as in the sixth embodiment (FIG. 6). In this case, assuming that the DC voltage boosted by the pulse transformer 19 is E, the pulse generation time T _ON of the pulse generation circuit 18 can be obtained from the following equation (11-1).

The principal part circuit diagram of the charging device which shows Embodiment 1 of this invention. The principal part circuit diagram of the charging device which shows Embodiment 2 of this invention. The principal part circuit diagram of the charging device which shows Embodiment 3 of this invention. The principal part circuit diagram of the charging device which shows Embodiment 4 of this invention. The principal part circuit diagram of the charging device which shows Embodiment 5 of this invention. The principal part circuit diagram of the charging device which shows Embodiment 6 of this invention. Circuit example of quick charge and fine adjustment charge (part 1). DC / Chopper current / voltage waveform. Circuit example of quick charge and fine adjustment charge (part 2). LC resonance type current / voltage waveform. An example of a change in charging voltage.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 DC power supply 2, 4 Semiconductor switch 3 Reactor 7 Load capacitor 8 Voltage control circuit 9 Multiplication circuit 31 Temperature detector 32 Temperature correction circuit

Claims (10)

DC chopper type quick charging circuit that quickly charges the capacitor to the target voltage close to the charging voltage command value by the output of the DC chopper circuit, and fine adjustment charging that charges the capacitor to the charging voltage command value by constant current charging after the rapid charging In a capacitor charging device comprising a circuit,
The voltage control circuit of the quick charge circuit includes a control unit that corrects a change in the quick charge voltage due to a change in capacitance of the capacitor or a change in reactor value of the reactor of the quick charge circuit. . An LC resonance type quick charge circuit that rapidly charges the capacitor to a target voltage close to the charge voltage command value by passing an oscillating current through the DC reactor through the DC voltage reactor, and charging the capacitor with constant current charging after the rapid charge In a capacitor charging device with a fine adjustment charging circuit that charges to a voltage command value,
The voltage control circuit of the quick charge circuit includes a control unit that corrects a change in the quick charge voltage due to a change in capacitance of the capacitor or a change in reactor value of the reactor of the quick charge circuit. .   The control means calculates the capacitor capacity C or the reactor value L from the temperature measurement value of the capacitor itself or the reactor itself, or the temperature measurement value around the quick charging circuit, and determines the calculated capacitor capacity C or the reactor value L. The capacitor charging device according to claim 1, wherein a change in the rapid charging voltage due to fluctuation is corrected by output current control of the rapid charging circuit.   The control means calculates the capacitor capacitance C ′ from the measurement results of the coarse charge voltage V1, fine adjustment voltage V2, fine adjustment current I, and fine adjustment charge time T of the capacitor, and the fluctuation of the calculated capacitor capacitance C ′. The capacitor charging device according to claim 1, wherein a change in the rapid charging voltage due to the output is corrected by an output current control of the rapid charging circuit.   The control means calculates the capacitor capacitance C ′ from the measurement result of the fine adjustment voltage V2, the fine adjustment current I, the fine adjustment charging time T, and the rough charge voltage V1 ′ predicted from these measurement results, and calculates the calculated capacitor 3. The capacitor charging device according to claim 1, wherein a change in the rapid charging voltage due to a change in the capacity C ′ is corrected by controlling the output current of the rapid charging circuit or by controlling the target voltage V. 4.   The control means calculates a reactor value L ′ of the reactor from a time T2 during which a current flows through the reactor, a current I2 at that time and a DC power supply voltage E of the DC chopper circuit, and the calculated reactor value L ′ The capacitor charging device according to claim 1, wherein a change in the rapid charging voltage due to fluctuation is corrected by output current control of the rapid charging circuit.   When the fine adjustment charging time T exceeds a preset time T2, the control means obtains the ratio obtained from the fine adjustment current I, the measurement result of the fine adjustment charging time T, the capacitor capacity C, and the charge voltage command value V *. 3. The capacitor charging device according to claim 1, wherein the target voltage V after the next time is switched and charging is performed up to a charging voltage command value V * within a fine adjustment charging period. The control means calculates in advance the fluctuation of the capacitor capacity C or the reactor value L, and immediately before the start of the quick charge, the calculated capacity C, the reactor value L, the DC power supply voltage E of the quick charge circuit, and the target 2. The capacitor charging device according to claim 1, wherein a change in a rapid charging voltage is corrected by controlling an _ON period T _ON of the rapid charging circuit from the voltage V. 3.   The control means calculates the reactor value L ′ of the reactor from the capacitance C of the capacitor, the time T2 during which the current flows to the reactor, the current I2 at that time and the DC power supply voltage E of the quick charging circuit, 3. The capacitor charging apparatus according to claim 2, wherein a change in the rapid charging voltage due to the fluctuation of the calculated reactor value L 'is corrected by output current control of the rapid charging circuit. The control means controls the on-time period T _ON of the quick charge circuit from the capacitor capacity C, the reactor value L, the DC power supply voltage E immediately before the start of quick charge, and the charge voltage command value V *, thereby adjusting the rapid charge voltage. The capacitor charging device according to claim 2, wherein the change is corrected.

Images