JP2015070644A5

JP2015070644A5 -

Info

Publication number: JP2015070644A5
Application number: JP2013200565A
Authority: JP
Filing date: 2013-09-26
Publication date: 2015-08-13
Anticipated expiration: 2033-09-26

Claims

An AC / DC converter that converts AC power supplied from an AC power source into DC power and supplies it to a DC load,
First and second rectifiers connected in parallel to the AC power supply via a reactor;
Two capacitors connected in series between output terminals of the first rectifier to the DC load;
Two switching elements connected in series between the output terminals of the second rectifier, the connection point being connected to the connection point of the two capacitors;
A control unit for controlling the DC load by controlling the two switching elements to perform step-up control of the output voltage value to the DC load;
With
The controller is
Based on the voltage between both ends of the two capacitors during the boost control, the failure determination of the two switching elements is performed, and it is determined that one of the two switching elements is defective. In this case, the two switching elements are turned off to stop the step-up control and stop the DC load.

An AC / DC converter that converts AC power supplied from an AC power source into DC power and supplies it to a DC load,
First and second rectifiers connected in parallel to the AC power supply via a reactor;
Two capacitors connected in series between output terminals of the first rectifier to the DC load;
Two switching elements connected in series between the output terminals of the second rectifier, the connection point being connected to the connection point of the two capacitors;
A control unit for controlling the DC load by controlling the two switching elements to perform step-up control of the output voltage value to the DC load;
With
The controller is
The AC / DC converter is characterized in that the control of the DC load and the step-up operation are not started when the voltage between both ends of at least one of the two capacitors is not more than a specified value.

An AC / DC converter that converts AC power supplied from an AC power source into DC power and supplies it to a DC load,
First and second rectifiers connected in parallel to the AC power supply via a reactor;
Two capacitors connected in series between output terminals of the first rectifier to the DC load;
Two switching elements connected in series between the output terminals of the second rectifier, the connection point being connected to the connection point of the two capacitors;
Two reverse voltage prevention diodes connected in reverse parallel to the two capacitors, each having a larger current capacity than a current value that can be passed through the DC load;
A control unit for controlling the DC load by controlling the two switching elements to perform step-up control of the output voltage value to the DC load;
With
The controller is
Based on the voltage between both ends of the two capacitors during the boost control, the failure determination of the two switching elements is performed, and it is determined that one of the two switching elements is defective. In this case, the two switching elements are controlled to be turned off to stop the step-up control, and the operation range of the DC load is restricted from that during normal operation.

When the controller determines that the failure has occurred, if one of the two capacitors has a voltage across a predetermined value or less, one of the two switching elements has failed. AC-DC converter according to claim 1 or 3, wherein determining that there.

An AC / DC converter that converts AC power supplied from an AC power source into DC power and supplies it to a DC load,
First and second rectifiers connected in parallel to the AC power supply via a reactor;
Two capacitors connected in series between output terminals of the first rectifier to the DC load;
Two switching elements connected in series between the output terminals of the second rectifier;
A protective switch inserted between the connection point of the two capacitors and the connection point of the two switching elements;
A control unit for controlling the DC load by controlling the two switching elements to perform step-up control of the output voltage value to the DC load;
With
The controller is
During the period in which the DC load is operating and the boost control is stopped, failure determination of the two switching elements is performed based on the current flowing between the output terminals of the second rectifier, and the two In the case of a switching element failure other than both of the switching elements being short-circuited, the protection switch is turned off, the two switching elements are turned off, and a full-wave rectification state is established. An AC / DC converter characterized in that it is operated with a more restrictive than normal operation.

When the controller determines the failure, the current flowing between the output terminals of the second rectifier is less than a specified value in a state where the two switching elements are on-controlled and the protection switch is off-controlled. 6. The AC / DC converter according to claim 5, wherein one or both of the first and second switching elements are determined to have an open failure.

The controller, when performing the failure determination, turns on one of the two switching elements, turns off the other, and turns off the protection switch, and outputs the second rectifier. When the current flowing between the terminals is equal to or greater than a specified value, it is determined that the other of the two switching elements is short-circuited, the protection switch is turned off, and one of the two switching elements is used to The boost control using both the wave rectification mode and the power supply short-circuit mode is performed, and the target DC voltage of the boost control is limited to an output voltage range in which the harmonic regulation value can be cleared, and the operating range of the DC load is 6. The AC / DC converter according to claim 5, wherein the AC / DC converter is operated in a larger scale than the full-wave rectification state.

An AC / DC converter that converts AC power supplied from an AC power source into DC power and supplies it to a DC load,
First and second rectifiers connected in parallel to the AC power supply via a reactor;
Two capacitors connected in series between output terminals of the first rectifier to the DC load;
Two switching elements connected in series between the output terminals of the second rectifier;
A protective switch inserted between the connection point of the two capacitors and the connection point of the two switching elements;
A plurality of resistors connected in series between output terminals of the first rectifier to the DC load, the connection point being connected to a connection point of the two switching elements;
A control unit for controlling the DC load by controlling the two switching elements to perform step-up control of the output voltage value to the DC load;
With
The controller is
The first load voltage between the output terminals of the first rectifier and the negative output terminal of the first rectifier as a reference in a period in which the DC load is operating and the boost control is stopped. Based on the second voltage at the connection point of the two switching elements, the failure determination of the two switching elements is performed, and in the case of a switching element failure other than both of the two switching elements being short-circuited, An AC / DC converter characterized in that a protection switch is controlled to be turned off, a full-wave rectification state in which the two switching elements are controlled to be turned off, and an operating range of the DC load is limited compared to normal operation.

The controller, when performing the failure determination, turns on one of the two switching elements, turns off the other, and turns off the protection switch, and the half value of the first voltage 9. The AC according to claim 8, wherein one of the two switching elements is determined to have an open failure when an absolute value of a value obtained by subtracting the second voltage from the threshold is less than a specified value. DC converter.

The controller, when performing the failure determination, has an absolute value of a value obtained by subtracting the second voltage from a half value of the first voltage in a state where the two switching elements and the protection switch are turned off. When it is equal to or greater than a specified value, it is determined that one of the two switching elements is short-circuited, the protection switch is turned off, and the full-wave rectification mode and the power supply are short-circuited using one of the two switching elements. In addition to performing step-up control in combination with the mode, the target DC voltage of the step-up control is limited to an output voltage range in which the harmonic regulation value can be cleared, and the operating range of the DC load is more than the full-wave rectification state. The AC / DC converter according to claim 8, wherein the AC / DC converter is expanded and operated.

In the failure determination, the controller determines that the failure is not a failure in the failure determination after a lapse of a specified time after the failure determination when the number of times that the failure is determined to be consecutive is less than a specified value. The AC / DC converter according to any one of claims 1 to 10, wherein the step-up control is started when the control is started.

12. The AC / DC converter according to claim 1, wherein a reference ground of the control unit is connected to a negative output terminal of the first rectifier in a non-insulated manner. 13.

13. The AC according to claim 1, further comprising a failure notification unit that notifies the failure when the control unit determines that the switching element has a short failure or an open failure. DC converter.

The AC / DC converter according to any one of claims 1 to 13,
As the DC load, an inverter main circuit for driving a permanent magnet motor of a compressor by converting DC power supplied from the AC / DC converter into AC power;
A compressor driving device comprising:

An air conditioner comprising the compressor driving device according to claim 14, wherein refrigerant is circulated by a compressor driven by the compressor driving device.