Power supply device compatible with AC/DC input and control method thereof
The present application provides a power supply device compatible with AC/DC input and a control method thereof, the device comprising a power factor correction circuit, a direct current-to-direct current (DC/DC) circuit, a bypass circuit, an input sampling circuit, and a controller. The power factor correction circuit is connected to the DC/DC circuit. The bypass circuit is connected to a boost circuit input end of the power factor correction circuit and an input end of the DC/DC circuit. The controller is connected to the input sampling circuit and the power factor correction circuit respectively, for controlling the power factor correction circuit to stabilize the output voltage within a preset range according to an input signal collected by the input sampling circuit, or turning off the power factor correction circuit and providing power for the DC/DC circuit via the bypass circuit.
1 . A power supply device compatible with an alternating current (AC)/direct current (DC) input, characterized in comprising a power factor correction circuit, a direct current-to-direct current (DC/DC) circuit, a bypass circuit, an input sampling circuit, and a controller;
the power factor correction circuit is connected to the DC/DC circuit;
the bypass circuit is connected to a boost circuit input end of the power factor correction circuit and an input end of the DC/DC circuit;
the controller is connected to the input sampling circuit and the power factor correction circuit respectively;
wherein the input sampling circuit is configured to collect an input signal and analyze a type of the input signal;
when a peak value of an input AC voltage is less than an input DC voltage and a range of the input DC voltage is within a first preset range, the controller is configured to:
when the type of the input signal is an AC input, control the power factor correction circuit to perform a power factor correction function and stabilize an output voltage within a second preset range; and
when the type of the input signal is a DC input, turn off the power factor correction circuit and control the bypass circuit to provide power to the DC/DC circuit.
2 . The power supply device compatible with AC/DC input according to claim 1 , characterized in that, the bypass circuit comprises a low conduction voltage drop component.
3 . The power supply device compatible with AC/DC input according to claim 2 , characterized in that, the power factor correction circuit is a boost-type bridged power factor correction circuit, the boost-type bridged power factor correction circuit comprises an uncontrolled rectifier bridge and a boost circuit, and the boost circuit is a single-phase boost circuit, a two-phase boost circuit or a multi-phase interleaved boost circuit.
4 . The power supply device compatible with AC/DC input according to claim 3 , characterized in that, when a voltage polarity of the DC input of the power supply device compatible with AC/DC input is changed, the low conduction voltage drop component comprises a first conduction unit and a second conduction unit, the first conduction unit is connected to an input positive end of the uncontrolled rectifier bridge and an output positive end of the boost circuit, respectively, and the second conduction unit is connected to an input negative end of the rectifier bridge and the output positive end of the boost circuit, respectively.
5 . The power supply device compatible with AC/DC input according to claim 1 , characterized in that, the power factor correction circuit is a boost-type bridgeless power factor correction circuit, the boost-type bridgeless power factor correction circuit comprises a boost circuit, a first switch, a second switch, a third switch and a fourth switch;
the first switch is disposed between an inductor and a positive end of a capacitor of the boost circuit, and the second switch is disposed between the inductor and a negative end of the capacitor of the boost circuit;
the third switch is disposed between a negative end of the AC/DC input and the positive end of the capacitor, and the fourth switch is disposed between the negative end of the AC/DC input and the negative end of the capacitor.
6 . The power supply device compatible with AC/DC input according to claim 5 , characterized in that, the bypass circuit comprises a low conduction voltage drop component, and when a voltage polarity of the DC input of the power supply device compatible with AC/DC input is changed, the low conduction voltage drop component comprises a first conduction unit and a second conduction unit, the first conduction unit is connected to an input end of the inductor of the boost circuit and an output positive end of the boost circuit, respectively, and the second conduction unit is connected to the input end of the inductor of the boost circuit and an output negative end of the boost circuit, respectively.
7 . A control method suitable for the power supply device compatible with AC/DC input according to claim 1 , characterized in that, the method comprises:
collecting the input signal and analyzing the type of the input signal via the input sampling circuit, and
when the peak value of the input AC voltage is less than the input DC voltage and the range of the input DC voltage is within the first preset range, performing the following operations by the controller:
when the type of the input signal is an AC input, controlling the power factor correction circuit to perform the power factor correction function, and stabilizing the output voltage of the power factor correction circuit within the second preset range; and
when the type of the input signal is a DC input, turning off the power factor correction circuit and controlling the bypass circuit to provide power to the DC/DC circuit.
8 . The control method suitable for the power supply device compatible with AC/DC input according to claim 7 , characterized in that, the bypass circuit comprises a low conduction voltage drop component.
9 . The control method suitable for the power supply device compatible with AC/DC input according to claim 8 , characterized in that, the power factor correction circuit is a boost-type bridged power factor correction circuit, the boost-type bridged power factor correction circuit comprises an uncontrolled rectifier bridge and a boost circuit, and the boost circuit is a single-phase boost circuit, a two-phase boost circuit or a multi-phase interleaved boost circuit.
10 . The control method suitable for the power supply device compatible with AC/DC input according to claim 9 , characterized in that, when a voltage polarity of the DC input of the power supply device compatible with AC/DC input is changed, the low conduction voltage drop component comprises a first conduction unit and a second conduction unit, the first conduction unit is connected to an input positive end of the uncontrolled rectifier bridge and an output positive end of the boost circuit, respectively, and the second conduction unit is connected to an input negative end of the rectifier bridge and the output positive end of the boost circuit, respectively.
11 . The control method suitable for the power supply device compatible with AC/DC input according to claim 7 , characterized in that, the power factor correction circuit is a boost-type bridgeless power factor correction circuit, the boost-type bridgeless power factor correction circuit comprises a boost circuit, a first switch, a second switch, a third switch and a fourth switch;
the first switch is disposed between an inductor and a positive end of a capacitor of the boost circuit, and the second switch is disposed between the inductor and a negative end of the capacitor of the boost circuit;
the third switch is disposed between a negative end of the AC/DC input and the positive end of the capacitor, and the fourth switch is disposed between the negative end of the AC/DC input and the negative end of the capacitor.
12 . The control method suitable for the power supply device compatible with AC/DC input according to claim 11 , characterized in that, the bypass circuit comprises a low conduction voltage drop component, and when a voltage polarity of the DC input of the power supply device compatible with AC/DC input is changed, the low conduction voltage drop component comprises a first conduction unit and a second conduction unit, the first conduction unit is connected to an input end of the inductor of the boost circuit and an output positive end of the boost circuit, respectively, and the second conduction unit is connected to the input end of the inductor of the boost circuit and an output negative end of the boost circuit, respectively.