Abstract: The present disclosure provides a method and device for detecting insulation impedance of a photovoltaic inverter.

Abstract: The present disclosure relates to an IGBT driving circuit and a power conversion device. The IGBT driving circuit includes a driving chip with a first driving signal port (Vo); a driving resistor adjustment circuit connected between the first driving signal port (Vo) and a gate (G) of an IGBT, a driving resistor formed by the driving resistor adjustment circuit being adjustable in size; a peak voltage detection circuit connected to the gate (G) of the IGBT which is conductive to the first driving signal port (Vo), the peak voltage detection circuit being configured to monitor whether a peak voltage occurs when the IGBT is turned off; and a resistor adjustment control circuit connected between the peak voltage detection circuit and the driving resistor adjustment circuit and configured to reduce a resistor formed by the driving resistor adjustment circuit when the peak voltage is monitored when the IGBT is turned off.

Abstract: A photovoltaic air conditioner control method and apparatus and a photovoltaic air conditioner. The method includes: detecting in real time the grid-connected side inverter module temperature and the grid-connected side current of a photovoltaic air conditioner; determining the interval in which the grid-connected inverter module temperature is located and the interval in which the grid-connected side current is located; and, on the basis of the determining results, performing frequency-limiting and frequency-reduction control of the photovoltaic air conditioner.

Abstract: A photovoltaic air conditioning system startup method, a controller, and a photovoltaic air conditioning system. The photovoltaic air conditioning system starting method includes: when a photovoltaic device meets a preset power generation condition, controlling a bidirectional converter to enter an operating state; and when the bidirectional converter enters the operating state, controlling a direct current-direct current converter connected to the photovoltaic device to enter an operating state, so that the photovoltaic device provides electric energy to an air-conditioning device by means of the direct current-direct current converter.

Abstract: The present disclosure relates to an air conditioner pipeline device and an air conditioner. The air conditioner pipeline device includes a gaseous refrigerant connecting pipe and a liquid refrigerant connecting pipe which are configured to be connected between an indoor unit and an outdoor unit of the air conditioner. At least one of the gaseous refrigerant connecting pipe and the liquid refrigerant connecting pipe adopts a multi-layer pipe. The multi-layer pipe includes at least two conductive pipes, sequentially and coaxially sleeved along a radial direction of the multi-layer pipe and configured to be connected to a power supply of the air conditioner to transmit power to the air conditioner, where an internal area of the innermost layer of conductive pipe is used for a refrigerant to flow; and first insulating layers, configured to achieve insulation of at least two conductive pipes.

Abstract: -- The present disclosure relates to an IGBT driving circuit and a power conversion device. The IGBT driving circuit includes a driving chip with a first driving signal port (Vo); a driving resistor adjustment circuit connected between the first driving signal port (Vo) and a gate (G) of an IGBT, a driving resistor formed by the driving resistor adjustment circuit being adjustable in size; a peak voltage detection circuit connected to the gate (G) of the IGBT which is conductive to the first driving signal port (Vo), the peak voltage detection circuit being configured to monitor whether a peak voltage occurs when the IGBT is turned off; and a resistor adjustment control circuit connected between the peak voltage detection circuit and the driving resistor adjustment circuit and configured to reduce a resistor formed by the driving resistor adjustment circuit when the peak voltage is monitored when the IGBT is turned off.

Abstract: The present disclosure provides a method and device for detecting insulation impedance of a photovoltaic inverter.

Abstract: Disclosed are a photovoltaic power supply system and a control method thereof, and an air conditioning unit. The system includes: a photovoltaic cell panel; a direct-current bus; a DC/DC converter, one end of which is connected to the photovoltaic cell panel, and the other end of which is connected to the direct-current bus; and a switch assembly arranged in parallel with the DC/DC converter, wherein one end of the switch assembly is connected to the photovoltaic cell panel, and the other end thereof is connected to the direct-current bus, and the switch assembly is used for controlling a grid connection mode of the photovoltaic cell panel. When the switch assembly is turned off, the photovoltaic cell panel is connected to the direct-current bus by means of the DC/DC converter; and when the switch assembly is turned on, the photovoltaic cell panel is directly connected to the direct-current bus.

Abstract: The present disclosure provides a parameter configuration device, including a first signal modulator, a second signal modulator and an operating member electrically connected with the first signal modulator or the second signal modulator. The first signal modulator and the second signal modulator have a connection state and a separated state. In the connection state, the first signal modulating element is electrically connected with the second signal modulating element, and the first signal modulating element and the second signal modulating element enclose a configuration space for a cable to pass through In the separated state, the first signal modulator is separated from the second signal modulator.

Abstract: A photovoltaic air conditioner control method and apparatus and a photovoltaic air conditioner. The method includes: detecting in real time the grid-connected side inverter module temperature and the grid-connected side current of a photovoltaic air conditioner; determining the interval in which the grid-connected inverter module temperature is located and the interval in which the grid-connected side current is located; and, on the basis of the determining results, performing frequency-limiting and frequency-reduction control of the photovoltaic air conditioner.

Abstract: A photovoltaic air conditioning system startup method, a controller, and a photovoltaic air conditioning system. The photovoltaic air conditioning system starting method includes: when a photovoltaic device meets a preset power generation condition, controlling a bidirectional converter to enter an operating state; and when the bidirectional converter enters the operating state, controlling a direct current-direct current converter connected to the photovoltaic device to enter an operating state, so that the photovoltaic device provides electric energy to an air-conditioning device by means of the direct current-direct current converter.