JP2015122835A - Power unit, air conditioner with the same, and heat pump hot-water supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power unit which prevents a secondary failure caused by a failure of components forming a step-up chopper circuit and can be continuously used even if a failure occurs, an air conditioner with the same and a heat pump hot-water supply device.SOLUTION: The power unit comprises: pressure rise means 200 in which a plurality of step-up chopper circuits 3 and 4 including reactors 3a and 4a, switch elements 3b and 4b and reverse block diodes 3c and 4c are connected in parallel between rectifying means 2 and smoothing means 5; and control means 11 which performs pressure rise control for executing pressure rising by driving the switch elements 3b and 4b forming the plurality of step-up chopper circuits 3 and 4 on the basis of step-up chopper currents flowing into the step-up chopper circuits, an input voltage to the pressure rise means 200 and an output voltage to a load, and performs failure time control if a failure is determined in any one of the reactors 3a and 4a, the switch elements 3b and 3b and the reverse block diodes 3c and 4c forming the plurality of step-up chopper circuits 3 and 4.

Description

  The present invention relates to a power supply device, an air conditioner including the power supply device, and a heat pump hot water supply device.

  Conventionally, a so-called interleaved power factor correction circuit has been proposed in which currents flowing through a plurality of inductors individually provided in a plurality of current paths separated from a full-wave rectified AC power source are switched in different phases. (For example, patent document 1).

JP 2007-195282 A

  A power supply device including an interleaved power factor correction circuit has a configuration including a plurality of boost chopper circuits including a reactor, a switch element, and a reverse blocking diode, and has a failure rate higher than a configuration including only one boost chopper circuit. Get higher. Also, for example, even if one reverse blocking diode of a plurality of boost chopper circuits has an open failure, the other boost chopper circuits do not open the circuit, so that the open failure of this reverse blocking diode cannot be detected and the operation continues. If this happens, the energy stored in the reactor will lose its place when the switch element of the step-up chopper circuit including the reverse blocking diode that has failed to open is turned off, and an excessive voltage will be applied to the switch element, resulting in a secondary failure. May be incurred. In addition, there is a problem that it is difficult to continuously use the equipment due to such a secondary failure.

  The present invention has been made in view of the above, and in a power supply apparatus including an interleaved power factor correction circuit having a plurality of boost chopper circuits, a failure of each component constituting the boost chopper circuit is detected. Thus, it is an object of the present invention to provide a power supply device that can prevent a secondary failure in advance and can be used continuously even when the failure occurs, an air conditioner including the power supply device, and a heat pump hot water supply device.

  In order to solve the above-described problems and achieve the object, a power supply apparatus according to the present invention includes a rectifying unit that rectifies an alternating current supplied from an alternating current power source, a smoothing unit that smoothes a direct current supplied to a load, a reactor, and a switch. A plurality of step-up chopper circuits each having an element and a reverse blocking diode for detecting a plurality of step-up chopper circuit currents flowing into the plurality of step-up chopper circuits, and a plurality of step-up chopper circuits connected in parallel between the rectifying unit and the smoothing unit; Current detecting means, input voltage detecting means for detecting an input voltage to the boosting means, output voltage detecting means for detecting an output voltage to the load, each boosting chopper circuit current, the input voltage, and the Based on the output voltage, the switching elements that drive the respective booster chopper circuits are boosted and boosted. A control means for performing failure-time control corresponding to the failed element when determining the failure of at least one of the reactors, the switch elements, and the reverse blocking diodes constituting the boost chopper circuit; It is characterized by providing.

  According to the present invention, it is possible to prevent a secondary failure due to a failure of each component constituting the step-up chopper circuit and to enable continuous use even when a failure occurs.

FIG. 1 is a diagram of a configuration example of the power supply device according to the first embodiment. FIG. 2 is a timing chart for explaining a schematic operation of the power supply device according to the first embodiment. FIG. 3 is a diagram illustrating a first half of a control flowchart example in the power supply device according to the first embodiment. FIG. 4 is a diagram illustrating a second half of the control flowchart example in the power supply device according to the first embodiment. FIG. 5 is a diagram of a configuration example of the power supply device according to the second embodiment.

  Hereinafter, a power supply device, an air conditioner including the power supply device, and a heat pump hot water supply device according to an embodiment of the present invention will be described with reference to the accompanying drawings. In addition, this invention is not limited by embodiment shown below.

Embodiment 1 FIG.
FIG. 1 is a diagram of a configuration example of the power supply device according to the first embodiment. As shown in FIG. 1, a power supply device 100 according to the first embodiment includes a rectifying unit 2 that rectifies alternating current supplied from an alternating current power supply 1 and an inverter 9 for driving a motor 10 connected as a load of the power supply device 100. A first step-up chopper circuit 3 comprising a smoothing means 5, a first reactor 3a, a first switch element 3b, and a first reverse blocking diode 3c, and a second reactor. 4a, a second switch element 4b, and a second boost chopper circuit 4 including a second reverse blocking diode 4c.

  The first boost chopper circuit 3 and the second boost chopper circuit 4 are connected in parallel between the rectifying means 2 and the inverter 9 to constitute the boost means 200. The first step-up chopper circuit 3 and the second step-up chopper circuit 4 respectively step-up chop the output of the rectifier 2.

  The power supply apparatus 100 according to the first embodiment also detects current detection means 6a for detecting a boost chopper circuit current flowing into the first boost chopper circuit 3, and a boost chopper circuit current flowing into the second boost chopper circuit 4. Connected to the input terminal of the rectifier 2, the current detector 6 b for detecting the input voltage, the input voltage detector 7 for detecting the input voltage to the booster 200, the output voltage detector 8 for detecting the output voltage to the inverter 9, Voltage zero cross detection means 12 for detecting the voltage zero point of the AC power supply 1, each boost chopper circuit current detected by each current detection means 6a, 6b, input voltage detected by the input voltage detection means 7, and output voltage detection Based on the output voltage detected by the means 8, the first switch element 3b and the second boost chopper circuit constituting the first boost chopper circuit 3 are used. 4 and the second switching element 4b constituting drives the and a control unit 11 for controlling the (boost control) for boosting the output of the rectifier means 2.

  In the boosting means 200 including the first boosting chopper circuit 3 and the second boosting chopper circuit 4, the control means 11 drives the first switch element 3b and the second switch element 4b with a phase difference of 180 degrees. It operates as a so-called interleave type power factor correction circuit.

  In the example shown in FIG. 1, the boosting unit 200 is exemplified by a configuration in which two boosting circuits, the first boosting chopper circuit 3 and the second boosting chopper circuit 4, are provided. However, three or more boosting chopper circuits are provided. It may be configured to provide an interleave operation.

  Further, in the example shown in FIG. 1, the input voltage detection means 7 and the output voltage detection means 8 detect the midpoint voltage of the series resistance provided between the input terminals and the output terminals of the booster 200, respectively. However, any configuration capable of obtaining the input voltage and the output voltage may be used, and the input voltage and output voltage detection technique and configuration by the input voltage detection means 7 and the output voltage detection means 8 may be used. Needless to say, the present invention is not limited by the above. Further, in the example shown in FIG. 1, the control unit 11 also controls the inverter 9 connected as a load. However, it goes without saying that the control unit 11 may have another control unit for controlling the inverter 9.

  Next, the operation of the power supply apparatus 100 according to the present embodiment will be described with reference to FIGS. FIG. 2 is a timing chart for explaining a schematic operation of the power supply device according to the first embodiment. FIG. 2A shows the waveforms of the input voltage Vi and the output voltage Vo, and FIG. 2B shows the detection timing of the voltage zero point of the AC power supply 1 by the voltage zero cross detection means 12. 2C shows the control timing of the first switch element 3b, FIG. 2D shows the control timing of the second switch element 4b, and FIG. 2E shows the first switch element 3b. 2 (f) shows the current I1 flowing into the boost chopper circuit 3, FIG. 2 (f) shows the current I2 flowing into the second boost chopper circuit 4, and FIG. 2 (g) shows the alternating current detected by the voltage zero-cross detection means 12. The voltage phase of the alternating current power supply 1 obtained based on the voltage zero point of the power supply 1 is shown.

  FIG. 2 shows an example in which all the constituent elements constituting the boosting means 200 are all normal, and shows each state before starting the above-described boosting control after the AC power supply 1 is turned on. . In FIG. 2, in the period Ta, the first switch element 3b and the second switch element 4b are turned off, and in the period Tb, the first switch element 3b in a period after 0 degrees of the voltage phase of the AC power supply 1. In the period Tc, the second switch element 4b is on-controlled in a period after 180 degrees of the voltage phase of the AC power supply 1.

  In the present embodiment, in addition to the above-described boost control, the control unit 11 controls to prevent a secondary failure due to the failure when determining a failure of any of the constituent elements constituting the boost unit 200 (hereinafter referred to as “failure”). ("Control at the time of failure"). It should be noted that this failure time control can also be positioned as a control that is activated in accordance with elements constituting the boosting means 200.

  Next, a failure determination method for each component constituting the booster 200 will be described.

  First, a method for determining a short-circuit fault between the first reverse blocking diode 3c and the second reverse blocking diode 4c will be described. If all the constituent elements constituting the boosting means 200 are normal, the average value Viaave of the input voltage Vi becomes smaller than the average value Voave of the output voltage Vo regardless of whether or not boost control is performed.

  On the other hand, when the first reverse blocking diode 3c constituting the first boost chopper circuit 3 or the second reverse blocking diode 4c constituting the second boost chopper circuit 4 is short-circuited, the smoothing means 5 is used. Therefore, the average value Viaave of the input voltage Vi is almost equal to the average value Voave of the output voltage Vo.

  Therefore, in the present embodiment, the difference between the average value Voave of the output voltage Vo and the average value Viaave of the input voltage Vi is obtained, and when the voltage difference is smaller than a preset voltage threshold, the first reverse prevention It is determined that a short circuit failure has occurred in the diode 3c or the second reverse blocking diode 4c. Here, as the voltage threshold, for example, the average value Voave of the output voltage Vo and the input voltage when each of the constituent elements constituting the first boost chopper circuit 3 and the second boost chopper circuit 4 are normal, for example. What is necessary is just to be below the minimum value of the difference with the average value Via of Vi.

  Next, a method for determining an open failure of the first reverse blocking diode 3c, the first reactor 3a, the second reverse blocking diode 4c, and the second reactor 4a will be described.

  As shown in the period Ta in FIG. 2, when the first switch element 3 b and the second switch element 4 b are turned off after the AC power source 1 is turned on, all the constituent elements constituting the booster 200 are all If normal, a current flows through the first boost chopper circuit 3 and the second boost chopper circuit 4 in a period including 90 degrees or 270 degrees of the voltage phase of the AC power supply 1.

  On the other hand, for example, when the first reactor 3a constituting the first step-up chopper circuit 3 has an open failure, the first step-up chopper is in a period including 90 degrees or 270 degrees of the voltage phase of the AC power supply 1. No current flows through the circuit 3.

  Therefore, in the present embodiment, before the boost control is started after the AC power supply 1 is turned on, a preset setting period including 90 degrees or 270 degrees of the voltage phase of the AC power supply 1 (hereinafter referred to as “first setting period”). Currents flowing in the first boost chopper circuit 3 and the second boost chopper circuit 4 (hereinafter referred to as “boost chopper circuit current”) I1 and I2 are detected, and the boost chopper circuit current I1 is If it is smaller than the preset first current threshold, it is determined that the first reactor 3a or the first reverse blocking diode 3c constituting the first boost chopper circuit 3 has an open fault, and the boost When the chopper circuit current I2 is smaller than a preset first current threshold value, the second reactor 4a or the second reverse blocking diode constituting the second boost chopper circuit 4 is used. It determines that the one of de 4c is open fault. Here, the first current threshold value flows in the first set period when, for example, each of the components constituting the first boost chopper circuit 3 and the second boost chopper circuit 4 is normal. What is necessary is just to make it below the minimum value of an electric current value.

  Next, a method for determining an open failure of either the first switch element 3b or the second switch element 4b will be described.

  As shown in a period Tb of FIG. 2, before the boost control after the AC power supply 1 is turned on, if the first switch element 3b is on-controlled for a period after 0 degree of the voltage phase of the AC power supply 1, the boosting means If all the constituent elements constituting 200 are normal, a current I1 flows through the first step-up chopper circuit 3. Similarly, as shown in a period Tc in FIG. 2, if the second switch element 4 b is on-controlled for a period after 180 degrees of the voltage phase of the AC power supply 1 before starting the boost control after the AC power supply 1 is turned on. If all the constituent elements constituting the boosting means 200 are normal, the current I2 flows through the second boosting chopper circuit 4.

  On the other hand, for example, when the first switch element 3b has an open failure, the current I1 does not flow through the first step-up chopper circuit 3 even if the first switch element 3b is on-controlled. For example, when the second switch element 4b has an open failure, the current I2 does not flow through the second boost chopper circuit 4 even if the second switch element 4b is turned on.

  Therefore, in the present embodiment, the first switch element 3b and the second switch element set in advance at 0 degree or 180 degrees or more of the voltage phase of the AC power supply 1 before the start of the boost control after the AC power supply 1 is turned on. When each step-up chopper circuit current I1 and I2 is detected in a period during which ON of 4b is controlled (hereinafter referred to as a “second set period”), and the step-up chopper circuit current I1 is smaller than a preset second current threshold value Is determined that the first switch element 3b constituting the first boost chopper circuit 3 has an open failure, and when the boost chopper circuit current I2 is smaller than the second current threshold, the second It is determined that the second switch element 4b constituting the boost chopper circuit 4 has an open failure. Here, the second current threshold value flows in the second set period when, for example, each of the components constituting the first boost chopper circuit 3 and the second boost chopper circuit 4 is normal. What is necessary is just to make it below the minimum value of an electric current value.

  Next, a method for determining a short-circuit fault in either the first reactor 3a or the second reactor 4a will be described.

  As described above, if the first switch element 3b is on-controlled for a set period after 0 degree of the voltage phase of the AC power supply 1 before starting the boost control after the AC power supply 1 is turned on, the boosting means 200 is configured. If all the components are normal, a current I1 flows through the first boost chopper circuit 3. Similarly, as shown in a period Tc in FIG. 2, the second switch element 4 b is on-controlled during a set period after 180 degrees of the voltage phase of the AC power supply 1 before starting the boost control after the AC power supply 1 is turned on. Then, if all the constituent elements constituting the boosting means 200 are all normal, a current I2 flows through the second boosting chopper circuit 4.

  On the other hand, for example, when the first reactor 3a is short-circuited, if the first switch element 3b is turned on, the output of the rectifier 2 is short-circuited and an excessive current flows. Further, for example, when the second reactor 4a is short-circuited, if the second switch element 4b is turned on, the output of the rectifying means 2 is similarly short-circuited and an excessive current flows. .

  Therefore, in the present embodiment, before the boost control is started after the AC power supply 1 is turned on, the first chopper circuit current I1 in the second setting period is larger than the preset third current threshold value. When it is determined that the first reactor 3a constituting the step-up chopper circuit 3 is short-circuited and the step-up chopper circuit current I2 in the second setting period is larger than the second current threshold value, It is determined that the second reactor 4a constituting the boost chopper circuit 4 has a short circuit failure. Here, the third current threshold value flows in the second set period when, for example, each of the constituent elements constituting the first boost chopper circuit 3 and the second boost chopper circuit 4 is normal. What is necessary is just to make it more than the maximum value of an electric current value.

  When the failure of each component constituting the boosting unit 200 is determined by the above-described method, the control unit 11 performs failure time control for preventing a secondary failure due to the failure.

  For example, when it is determined that one of the first reverse blocking diode 3c and the second reverse blocking diode 4c is short-circuited during normal operation, the control unit 11 stops the boost control as the failure control. Alternatively, the boost control is not started when it is determined that one of the first reverse blocking diode 3c and the second reverse blocking diode 4c is short-circuited before the boost control is started after the AC power supply 1 is turned on. In this case, the control of the inverter 9 connected as a load is also stopped.

  Further, for example, before the boost control is started after the AC power supply 1 is turned on, an open failure of any of the first reverse blocking diode 3c, the first reactor 3a, the second reverse blocking diode 4c, and the second reactor 4a is caused. When the determination is made, the control unit 11 starts the boost control using a boost chopper circuit other than the boost chopper circuit including the component for which the failure has been determined as the failure control.

  Further, for example, when it is determined that one of the first switch element 3b and the second switch element 4b has an open failure before the boost control is started after the AC power source 1 is turned on, the control unit 11 performs the failure control. Then, boost control is started using a boost chopper circuit other than the boost chopper circuit including the component for which the failure has been determined.

  For example, when the short-circuit failure of either the first reactor 3a or the second reactor 4a is determined before the boost control is started after the AC power source 1 is turned on, the control means 11 Boost control is started using a boost chopper circuit other than the boost chopper circuit including the determined components.

  As a control at the time of failure, a part of the plurality of boost chopper circuits (here, for example, the second boost chopper circuit 4 when the failure of the component of the first boost chopper circuit 3 is determined) is selected. When the boost control is performed using the normal boost operation, the boost control is performed using all the boost chopper circuits (here, the first boost chopper circuit 3 and the second boost chopper circuit 4) constituting the boost means 200. The output voltage becomes smaller than the time. For this reason, the control means 11 performs control according to the output voltage of the power supply apparatus 100 also about the inverter connected as load.

  As described above, in the power supply device 100 according to the present embodiment, the inverter 9 and the motor 10 are stopped although the output voltage is limited compared to the normal operation depending on the failure state of each component constituting the booster 200. It becomes possible to operate without doing.

  In addition, depending on the component to be determined for failure and the failure state, it is possible to change the conditions for performing the failure control.

  For example, determination of an open fault in any of the first reverse blocking diode 3c, the first reactor 3a, the second reverse blocking diode 4c, and the second reactor 4a before the boost control is started after the AC power source 1 is turned on. Even in the case of determining the open failure of any of the first switch element 3b and the second switch element 4b, the control means 11 is a control other than the boost chopper circuit including the component for which the failure has been determined as the failure control. The boost control may be started using a boost chopper circuit.

  Further, for example, before the boost control is started after the AC power supply 1 is turned on, any one of the open faults of the first reverse blocking diode 3c, the first reactor 3a, the second reverse blocking diode 4c, and the second reactor 4a Even when the determination and the determination of the short-circuit failure of any of the first reactor 3a and the second reactor 4a are performed, the control unit 11 performs control other than the step-up chopper circuit including the component for which the failure has been determined as the failure control. The boost control may be started using a boost chopper circuit.

  Further, for example, before the boost control is started after the AC power supply 1 is turned on, any one of the open faults of the first reverse blocking diode 3c, the first reactor 3a, the second reverse blocking diode 4c, and the second reactor 4a In addition to the determination and the determination of the open fault of any of the first switch element 3b and the second switch element 4b, the determination of the short-circuit fault of any of the first reactor 3a and the second reactor 4a is further performed. Even when it is performed, the control means 11 may start the boost control using a boost chopper circuit other than the boost chopper circuit including the component determined to be faulty as the control at the time of failure.

  Next, an example of operation control including the above-described failure determination operation and failure time control will be described. FIG. 3 is a diagram illustrating a first half of a control flowchart example in the power supply device according to the first embodiment. FIG. 4 is a diagram illustrating the latter half of the control flowchart example in the power supply apparatus according to the first embodiment. In the example shown in FIGS. 3 and 4, an example is shown in which a failure of each component constituting the booster 200 is determined before the boost control is started after the AC power supply 1 is turned on.

  After the AC power source 1 is turned on (step ST101), the control means 11 does not perform the boost control, and the first switch element 3b and the second switch element 4b are off-controlled (period Ta shown in FIG. 2). ).

  The control means 11 starts control of the inverter 9 (step ST102), and starts the motor 10.

  Subsequently, the control means 11 obtains the input voltage average value Viaave from the input voltage Vi acquired from the input voltage detection means 7, obtains the output voltage average value Voave from the output voltage Vo acquired from the output voltage detection means 8, and outputs the output voltage Voave. The voltage difference between the voltage average value Voave and the input voltage average value Viave is compared with a preset voltage threshold value Vcheck (step ST103). When the voltage difference between the output voltage average value Voave and the input voltage average value Viave is smaller than the voltage threshold Vcheck (step ST103; Yes), the control unit 11 uses the first reverse blocking diode 3c or the second reverse blocking. It is determined that the diode 4c has a short circuit failure (step ST104). At this time, the control means 11 also stops the control of the inverter 9 without starting the boost control, stops the inverter 9 (step ST105), and ends the flow shown in FIGS.

  When the voltage difference between the output voltage average value Voave and the input voltage average value Viave exceeds the voltage threshold Vcheck (step ST103; No), the control unit 11 includes the first reverse blocking diode 3c and the second reverse blocking. It is determined that none of the diodes 4c are short-circuited (step ST106).

  Subsequently, the control unit 11 compares the step-up chopper circuit current I1 acquired from the current detection unit 6a in the first setting period with the preset first current threshold Icheck1 (step ST107). When the step-up chopper circuit current I1 is smaller than the first current threshold Icheck1 (step ST107; Yes), the control means 11 has an open failure in the first reactor 3a or the first reverse blocking diode 3c. Is determined (step ST108). At this time, the control means 11 prohibits subsequent ON control of the first switch element 3b (step ST109). When the step-up chopper circuit current I1 is equal to or greater than the first current threshold Icheck1 (step ST107; No), the control means 11 has an open failure in both the first reactor 3a and the first reverse blocking diode 3c. It is determined that there is not (step ST110).

  Similarly, the control unit 11 compares the step-up chopper circuit current I2 acquired from the current detection unit 6b in the first setting period with the preset first current threshold Icheck1 (step ST111). When the step-up chopper circuit current I2 is smaller than the first current threshold Icheck1 (step ST111; Yes), the control means 11 has an open failure in the second reactor 4a or the second reverse blocking diode 4c. Is determined (step ST112). At this time, the control means 11 prohibits subsequent ON control of the second switch element 4b (step ST113). When the step-up chopper circuit current I2 is greater than or equal to the first current threshold Icheck1 (step ST111; No), the control unit 11 has an open failure in both the second reactor 4a and the second reverse blocking diode 4c. It is determined that there is not (step ST114).

  Subsequently, the control means 11 determines whether or not on-control of the first switch element 3b is prohibited (step ST115). When the on control of the first switch element 3b is prohibited (step ST115; Yes), the process proceeds to step ST125 described later.

  When the on control of the first switch element 3b is not prohibited (step ST115; No), the control means 11 performs the first switch in the second setting period after 0 degrees of the voltage phase of the AC power supply 1. The element 3b is turned on (step ST116), and the step-up chopper circuit current I1 acquired from the current detection means 6a at this time is compared with a preset second current threshold value Icheck2 (step ST117). When the step-up chopper circuit current I1 is smaller than the second current threshold Icheck2 (step ST117; Yes), the control unit 11 determines that the first switch element 3b has an open failure (step ST118). . At this time, the control means 11 determines whether or not the on control of the second switch element 4b is prohibited (step ST119). When the on control of the second switch element 4b is not prohibited (step ST119; No), the process proceeds to step ST125 described later.

  When the on-control of the second switch element 4b is prohibited (step ST119; Yes), the control unit 11 stops the control of the inverter 9 without starting the boost control, and stops the inverter 9. (Step ST105), the flow shown in FIGS.

  When the step-up chopper circuit current I1 is greater than or equal to the second current threshold Icheck2 (step ST117; No), the control means 11 determines that the first switch element 3b is not open failure (step ST120). Subsequently, the boost chopper circuit current I1 in the second setting period is compared with a preset third current threshold Icheck3 (step ST121). When the step-up chopper circuit current I1 is larger than the third current threshold Icheck3 (step ST121; Yes), the control unit 11 determines that the first reactor 3a has a short circuit fault (step ST122). At this time, the control means 11 determines whether or not the on control of the second switch element 4b is prohibited (step ST123). When the on control of the second switch element 4b is not prohibited (step ST123; No), the process proceeds to step ST125 described later.

  When the ON control of the second switch element 4b is prohibited (step ST123; Yes), the control unit 11 stops the control of the inverter 9 without starting the boost control, and stops the inverter 9. (Step ST105), the flow shown in FIGS.

  When the step-up chopper circuit current I1 is equal to or smaller than the third current threshold Icheck3 (step ST121; No), the control unit 11 determines that the first reactor 3a is not short-circuited (step ST124).

  Subsequently, the control means 11 determines whether or not the on control of the second switch element 4b is prohibited (step ST125). When the on control of the second switch element 4b is prohibited (step ST125; Yes), the process proceeds to step ST135 described later.

  When the on-control of the second switch element 4b is not prohibited (step ST125; No), the control unit 11 performs the second switch in the second setting period after 180 degrees of the voltage phase of the AC power supply 1. The element 4b is turned on (step ST126), and the step-up chopper circuit current I2 acquired from the current detection means 6b at this time is compared with a preset second current threshold Icheck2 (step ST127). When the step-up chopper circuit current I2 is smaller than the second current threshold Icheck2 (step ST127; Yes), the control unit 11 determines that the second switch element 4b has an open failure (step ST128). . At this time, the control means 11 determines whether or not the on-control of the first switch element 3b is prohibited (step ST129). When the on control of the first switch element 3b is not prohibited (step ST129; No), the process proceeds to step ST135 described later.

  When the on control of the first switch element 3b is prohibited (step ST129; Yes), the control unit 11 stops the control of the inverter 9 without starting the boost control, and stops the inverter 9. (Step ST105), the flow shown in FIGS.

  When the step-up chopper circuit current I2 is greater than or equal to the second current threshold Icheck2 (step ST127; No), the control unit 11 determines that the second switch element 4b is not open failure (step ST130). Subsequently, the boost chopper circuit current I2 in the second setting period is compared with a preset third current threshold Icheck3 (step ST131). When the step-up chopper circuit current I2 is larger than the third current threshold Icheck3 (step ST131; Yes), the control unit 11 determines that the second reactor 4a has a short circuit fault (step ST132). At this time, the control means 11 determines whether or not the on-control of the first switch element 3b is prohibited (step ST133). When the on control of the first switch element 3b is not prohibited (step ST133; No), the process proceeds to step ST135 described later.

  When the on-control of the second switch element 4b is prohibited (step ST133; Yes), the control unit 11 stops the control of the inverter 9 without starting the boost control, and stops the inverter 9. (Step ST105), the flow shown in FIGS.

  When the step-up chopper circuit current I2 is equal to or smaller than the third current threshold Icheck3 (step ST131; No), the control unit 11 determines that the second reactor 4a is not short-circuited (step ST134).

  The control means 11 then opens the first reactor 3a constituting the first step-up chopper circuit 3, opens the first reverse blocking diode 3c, opens the first switch element 3b, or first It is determined whether or not any one or more of the short-circuit faults in the reactor 3a have been determined (step ST135). When determining an abnormality of at least one of an open fault of the first reactor 3a, an open fault of the first reverse blocking diode 3c, an open fault of the first switch element 3b, or a short-circuit fault of the first reactor 3a (Step ST135; Yes), the control means 11 subsequently opens the second reactor 4a constituting the second step-up chopper circuit 4 and opens the second reverse blocking diode 4c. The second switch It is determined whether or not any one or more abnormality of the open failure of the element 4b or the short-circuit failure of the second reactor 4a is determined (step ST136). When determining an abnormality of at least one of an open failure of the second reactor 4a, an open failure of the second reverse blocking diode 4c, an open failure of the second switch element 4b, or a short-circuit failure of the second reactor 4a (Step ST136; Yes), the control means 11 stops the control of the inverter 9 without starting the boost control, stops the inverter 9 (Step ST105), and ends the flow shown in FIGS. .

  Any abnormality among the open fault of the second reactor 4a, the open fault of the second reverse blocking diode 4c, the open fault of the second switch element 4b, and the short-circuit fault of the second reactor 4a was not determined. In this case (step ST136; No), the control means 11 starts boost control using only the second boost chopper circuit 4 (step ST137), and ends the flow shown in FIGS.

  Any abnormality among the open fault of the first reactor 3a, the open fault of the first reverse blocking diode 3c, the open fault of the first switch element 3b, and the short-circuit fault of the first reactor 3a was not determined. In the case (step ST135; No), the control means 11 subsequently opens the second reactor 4a constituting the second step-up chopper circuit 4 and opens the second reverse blocking diode 4c. It is determined whether or not any one or more abnormality of the open failure of the switch element 4b or the short-circuit failure of the second reactor 4a is determined (step ST138). When determining an abnormality of at least one of an open failure of the second reactor 4a, an open failure of the second reverse blocking diode 4c, an open failure of the second switch element 4b, or a short-circuit failure of the second reactor 4a (Step ST138; Yes), the control means 11 starts boost control using only the first boost chopper circuit 3 (Step ST139), and ends the flow shown in FIGS.

  Any abnormality among the open fault of the second reactor 4a, the open fault of the second reverse blocking diode 4c, the open fault of the second switch element 4b, and the short-circuit fault of the second reactor 4a was not determined. In this case (step ST138; No), the control means 11 starts normal boost control for interleaving the first boost chopper circuit 3 and the second boost chopper circuit 4 (step ST140). The flow shown in FIG.

  As described above, according to the power supply device of the first embodiment, when any one of the reactors, the switch elements, and the reverse blocking diodes constituting the plurality of step-up chopper circuits is determined, Since the control at the time of failure to prevent secondary failure due to failure is made, secondary failure due to failure of each component constituting the boost chopper circuit can be prevented in advance, and continuous use is possible even when failure occurs .

  More specifically, the difference between the input voltage to the boosting means and the output voltage to the load is obtained, and when the voltage difference is smaller than a preset voltage threshold, at least one of the plurality of boosting chopper circuits. It is determined that the reverse blocking diode that constitutes the short-circuit failure, and in this case, the boost control is not performed. Therefore, it is possible to prevent the occurrence of an excessive voltage and the accompanying secondary failure.

  In addition, before starting the boost control after turning on the AC power, each current flowing through the first boost chopper circuit and the second boost chopper circuit in the first setting period including 90 degrees or 270 degrees of the voltage phase of the AC power supply If the current flowing through the first boost chopper circuit is smaller than a first current threshold value set in advance, at least the first reactor or the first reverse blocking diode constituting the first boost chopper circuit is detected. When it is determined that one of them has an open failure and the current flowing through the second boost chopper circuit is smaller than a preset first current threshold, at least the second boost chopper circuit constituting the second boost chopper circuit is configured. It is determined that either one of the reactors 2 or the second reverse blocking diode has an open failure, and the voltage phase of the AC power supply is 0 ° or 180 ° after the first. When each current flowing through the first step-up chopper circuit and the second step-up chopper circuit is detected during the set period, and the current flowing through the first step-up chopper circuit is smaller than a preset second current threshold value, When it is determined that the first switch element constituting the first boost chopper circuit has an open failure, and the current flowing through the second boost chopper circuit is smaller than the second current threshold, When it is determined that the second switch element constituting the boost chopper circuit has an open failure, and the current flowing through the first boost chopper circuit in the second setting period is greater than a preset third current threshold value Is determined that the first reactor constituting the first step-up chopper circuit is short-circuited and the current flowing through the first step-up chopper circuit in the second setting period is the second current. If larger than the value, it is determined that the second reactor constituting the second step-up chopper circuit has a short-circuit fault, and the first reactor has an open fault and the first reverse blocking diode has an open fault. , First switch element open fault, first reactor short circuit fault, second reactor open fault, second reverse blocking diode open fault, second switch element open fault, or second reactor Even if a short circuit failure occurs, the boost control is performed using a healthy boost chopper circuit that does not cause any component failure, so all boost chopper circuits that constitute the boost means are used. Although the output voltage is limited compared to the normal operation in which the boost control is performed and the interleave operation is performed, the inverter and the motor connected as a load can be operated without being stopped. For this reason, for example, when applied to an air conditioner or a heat pump hot-water supply device, a minimum operation can be performed until a serviceman repairs the failure.

Embodiment 2. FIG.
In the first embodiment, determination of a reverse blocking diode short circuit fault, a reactor open fault, a reverse blocking diode open fault, a switch element open fault, and a reactor short circuit fault constituting a boosting unit having a plurality of boost chopper circuits In the present embodiment, a configuration for preventing the occurrence of a secondary failure at the time of a short-circuit failure of the switch element will be described.

  FIG. 5 is a diagram of a configuration example of the power supply device according to the second embodiment. In addition, the same code | symbol is attached | subjected to the component which is the same as that of Embodiment 1, or equivalent, and the detailed description is abbreviate | omitted. An example of operation control of the power supply apparatus 100a according to the present embodiment will be described with reference to FIGS. 3 and 4 described in the first embodiment.

  The power supply device 100a according to the second embodiment includes a first current fuse 13 connected between the AC power source 1 and the rectifying means 2 in addition to the configuration of FIG. And a second current fuse 14b connected between the rectifier 2 and the second reactor 4a. The second current fuse 14a is connected between the rectifier 2 and the second reactor 4a. Here, the current rating value of the first current fuse 13 is smaller than the current rating value of each component constituting the boosting means 200, and the current rating value of each of the second current fuses 14a and 14b is the first rating value. The current value is equal to or less than half of the rated current value of the current fuse 13.

  Next, an example of operation control of the power supply device 100a according to the second embodiment will be described with reference to FIGS. 3, 4, and 5. FIG.

  In the configuration shown in FIG. 5, for example, when the first switch element 3 b is short-circuited, the AC power source 1 → the first current fuse 13 → the rectifying means 2 → the second current fuse 14 a → the first reactor 3 a → the first Excessive current flows through the path of the switching element 3b → rectifier 2 → AC power source 1. At this time, the second current fuse 14a is blown out earlier than the other components constituting the first step-up chopper circuit 3 are secondary-failed by an excessive current. As a result, a failure mode equivalent to that in the case where the first reactor 3a or the first reverse blocking diode 3c described in the first embodiment has an open failure occurs. That is, in step ST107 of the control flowchart shown in FIG. 3, the step-up chopper circuit current I1 becomes smaller than the first current threshold Icheck1 (step ST107; Yes), and the first reactor 3a or the first reverse blocking diode 3c It is possible to determine an open failure, and further, a blowout of the second current fuse 14a due to a short circuit failure of the first switch element 3b (step ST108). In this case, it is determined that there is an abnormality in the components of the first boost chopper circuit 3 (step ST135; Yes), and further, it is determined that there is an abnormality in the components of the second boost chopper circuit 4. In this case (step ST136; Yes), the control of the inverter 9 is also stopped without starting the boost control, the inverter 9 is stopped (step ST105), and the flow shown in FIGS. If there is no abnormality in the components of the second boost chopper circuit 4 (step ST136; No), the control means 11 starts boost control using only the second boost chopper circuit 4 (step ST137), and FIG. , 4 is ended.

  Further, for example, when the second switch element 4b is short-circuited, the AC power source 1 → the first current fuse 13 → the rectifier 2 → the second current fuse 14b → the second reactor 4a → the second switch element 4b → Excessive current flows through the path from the rectifying means 2 to the AC power source 1. At this time, the second current fuse 14b is blown out earlier than the other components constituting the second boost chopper circuit 4 are secondary-failed by an excessive current. As a result, a failure mode equivalent to the case where the second reactor 4a or the second reverse blocking diode 4c described in the first embodiment has an open failure occurs. That is, in step ST111 of the control flowchart shown in FIG. 3, the step-up chopper circuit current I2 becomes smaller than the first current threshold Icheck1 (step ST111; Yes), and the second reactor 4a or the second reverse blocking diode 4c It becomes possible to determine whether the second current fuse 14b is blown or not due to an open circuit failure or a short circuit failure of the second switch element 4b (step ST112). In this case, if there is no abnormality in the components of the first boost chopper circuit 3 (step ST135; No), it is determined that there is an abnormality in the components of the second boost chopper circuit 4 (step ST138; Yes), boost control using only the first boost chopper circuit 3 is started (step ST139), and the flow shown in FIGS.

  Even when both the first switch element 3b and the second switch element 4b are short-circuited, if the second current fuses 14a and 14b are not blown for some reason, the first current fuse 13 The occurrence of secondary failure can be prevented by fusing. In this case, in step ST107 of the control flowchart shown in FIG. 3, the step-up chopper circuit current I1 becomes smaller than the first current threshold value Icheck1 (step ST107; Yes), and the first reactor 3a or the first reverse prevention is performed. An open failure of the diode 3c, and further, a blowout of the second current fuse 14a due to a short circuit failure of the first switch element 3b is detected (step ST108). In step ST111, the boost chopper circuit current I2 is Current threshold value Icheck1 (step ST111; Yes), the second reactor 4a or the second reverse blocking diode 4c is opened, and the second switch element 4b is short-circuited. Of the current fuse 14b is detected (step ST112). . In this case, in step ST135 and step ST136, it is assumed that both the components of the first boost chopper circuit 3 and the second boost chopper circuit 4 of the booster 200 are abnormal (step ST135; Yes, step ST136; Yes) Control of the inverter 9 is also stopped without starting the boost control, the inverter 9 is stopped (step ST105), and the flow shown in FIGS.

  As described above, according to the power supply device of the second embodiment, the first current fuse is inserted into the input of the rectifying means, and the currents are input to the inputs of the plurality of boost chopper circuits from the first current fuse, respectively. Since the second current fuse having a small rated value is inserted, even if a short circuit failure of the switch element occurs, the second current fuse can be melted to prevent the occurrence of a secondary failure. As in 1, since the boost control is performed using a healthy boost chopper circuit in which no failure of any component has occurred, the boost control is performed using all the boost chopper circuits constituting the boost means. Although the output voltage is limited compared to the normal operation that performs interleave operation, it becomes possible to operate without stopping the inverter and motor connected as a load, for example, When applied to the gas conditioning system or heat pump hot water supply device, it is possible to perform a minimum of operation until a service person to perform repair.

  Note that the configuration shown in the above embodiment is an example of the configuration of the present invention, and can be combined with another known technique, and a part thereof is omitted without departing from the gist of the present invention. Needless to say, it is possible to change the configuration.

  As described above, according to the present invention, in a power supply apparatus including an interleaved power factor correction circuit having a plurality of boost chopper circuits, secondary failures due to the failure of each component constituting the boost chopper circuit can be prevented. At the same time, it is useful as a technology that enables continuous use even when a failure occurs, and is particularly suitable for an air conditioner or a heat pump hot water supply device that connects a motor or an inverter for driving a motor as a load of a power supply device.

  DESCRIPTION OF SYMBOLS 1 AC power supply, 2 Rectification means, 3 1st pressure | voltage rise chopper circuit, 3a 1st reactor, 3b 1st switch element, 3c 1st reverse blocking diode, 4th 2nd pressure | voltage rise chopper circuit, 4a 2nd reactor 4b 2nd switching element 4c 2nd reverse blocking diode 5 smoothing means 6a 6b current detecting means 7 input voltage detecting means 8 output voltage detecting means 9 inverter 10 motor 11 control means 12 Voltage zero-cross detection means, 13 1st current fuse, 14a, 14b 2nd current fuse, 100, 100a power supply device, 200 boosting means.

Claims (14)

Rectification means for rectifying the alternating current supplied from the alternating current power supply;
Smoothing means for smoothing the direct current supplied to the load;
A step-up chopper circuit having a reactor, a switching element, and a reverse blocking diode, and a plurality of step-up means connected in parallel between the rectifying unit and the smoothing unit;
A plurality of current detection means for respectively detecting boost chopper circuit currents flowing into the plurality of boost chopper circuits;
An input voltage detecting means for detecting an input voltage to the boosting means;
Output voltage detection means for detecting an output voltage to the load;
Based on each of the boost chopper circuit currents, the input voltage, and the output voltage, performs boost control to drive and boost the switch elements constituting the plurality of boost chopper circuits, and the plurality of boost chopper circuits Control means for performing failure-time control corresponding to a failed element when determining a failure of at least one of the reactors, the switch elements, and the reverse blocking diodes;
A power supply device comprising:   The control means obtains a difference between the input voltage and the output voltage, and when the voltage difference is smaller than a preset voltage threshold, the inverse circuit constituting at least one of the plurality of boost chopper circuits. The power supply device according to claim 1, wherein it is determined that a blocking diode has a short circuit failure, and the step-up control is stopped as the control at the time of the failure. A voltage zero cross detecting means connected to the input of the rectifying means and detecting a voltage zero point of the AC power supply;
The control means includes
Before detecting the voltage phase of the AC power supply based on the voltage zero point and starting the boost control, the boost chopper circuit current is preliminarily set in a first set period including 90 degrees or 270 degrees of the voltage phase. 3. When detecting that it is smaller than a set first current threshold value, it is determined that the reactor or the reverse blocking diode constituting the boost chopper circuit has an open failure. The power supply device described in 1.   The control means starts the step-up control by using a step-up chopper circuit other than the step-up chopper circuit that has determined an open failure of the reactor or the reverse blocking diode as the control at the time of the failure. 4. The power supply device according to 3.   The control means controls the switch elements to be on during the second setting period after the voltage phase is 0 degrees or 180 degrees before starting the boost control, and the boost chopper circuit current is preset. 4. The power supply device according to claim 3, wherein when it is detected that the switching current is smaller than the second current threshold value, it is determined that the switch element constituting the boost chopper circuit has an open failure.   The control means starts the step-up control using a step-up chopper circuit other than the step-up chopper circuit that has determined an open-circuit failure of the reactor, the reverse blocking diode, or the switch element as the control at the time of the failure. The power supply device according to claim 5, wherein   The control means controls the switch elements to be on during the second setting period after the voltage phase is 0 degrees or 180 degrees before starting the boost control, and the boost chopper circuit current is preset. 4. The power supply device according to claim 3, wherein, when it is detected that the value is larger than a third current threshold value, it is determined that the reactor constituting the boost chopper circuit has a short circuit failure. 5.   The control means uses the boost chopper circuit other than the boost chopper circuit other than the boost chopper circuit that has determined an open fault of the reactor, a short circuit fault of the reactor, or an open fault of the reverse blocking diode as the on-failure control. The power supply device according to claim 7, wherein the power supply device is started.   When the control means detects that the boost chopper circuit current is larger than a preset third current threshold value during the second set period, the switch element is turned on, and the boost chopper circuit The power supply device according to claim 5, wherein it is determined that the reactor that constitutes the short circuit has failed.   The control means is a step-up chopper circuit other than the step-up chopper circuit that has determined the open-circuit failure of the reactor, the short-circuit failure of the reactor, the open-circuit failure of the reverse blocking diode, or the open-circuit failure of the switch element as the on-failure control The power supply apparatus according to claim 9, wherein the step-up control is started by using. A first current fuse inserted into one input of the rectifying means;
A plurality of second current fuses each having a rated current smaller than that of the first current fuses and inserted respectively at the inputs of the plurality of boost chopper circuits;
The power supply device according to claim 1, further comprising: A voltage zero cross detecting means connected to the input of the rectifying means and detecting a voltage zero point of the AC power supply;
The control means detects the voltage phase of the AC power source based on the voltage zero point, and starts the boost control in a first setting period including 90 degrees or 270 degrees of the voltage phase before starting the boost control. When it is detected that the chopper circuit current is smaller than the preset first current threshold, the reactor or the reverse blocking diode constituting the boost chopper circuit is caused by an open failure or a short circuit failure of the switch element. It is determined that the second current fuse is blown, and in the second setting period after the voltage phase is 0 degrees or 180 degrees, the switch elements are turned on, and the boost chopper circuit current is preset. When it is detected that the switching current is smaller than the second current threshold value, it is determined that the switch element constituting the boost chopper circuit has an open failure. In the second setting period, when the switch elements are turned on and when it is detected that the boost chopper circuit current is larger than a preset third current threshold, the boost chopper circuit is configured. It is determined that the reactor has a short-circuit failure, and the reactor is open-circuit failure, the reactor short-circuit failure, the reverse blocking diode open-circuit failure, the switch element open-circuit failure, or the switch element short-circuit failure. 12. The power supply device according to claim 11, wherein the step-up control is started using a step-up chopper circuit other than the step-up chopper circuit that has determined that the current fuse 2 is blown.   An air conditioner comprising the power supply device according to any one of claims 1 to 12.   A heat pump hot water supply apparatus comprising the power supply apparatus according to any one of claims 1 to 12.

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