CN-113972830-B - Totem pole power factor correction circuit, control method, device and equipment

CN113972830BCN 113972830 BCN113972830 BCN 113972830BCN-113972830-B

Abstract

The invention discloses a totem pole power factor correction circuit, a control method, a device and equipment, wherein the totem pole power factor correction circuit comprises a rectification module, a reactor, a capacitance module, a control module and a switch module, wherein the input end of the rectification module is connected with an alternating current power supply, the output end of the rectification module is used for being connected with a load, the capacitance module is connected with the output end and comprises a first capacitor and a second capacitor which are connected in series, the first connection point of the first capacitor and the second capacitor is connected with the alternating current power supply through the switch module, the control module is arranged to control the rectification module and the switch module according to load parameters, so that the totem pole power factor correction circuit is switched to a synchronous rectification mode or an uncontrolled rectification mode, loss and resources can be reduced under the condition that the load parameters are changed, and circuit efficiency is ensured. The invention can be widely applied to the technical field of control.

Inventors

ZHONG XIONGBIN
ZHANG JIENAN
ZENG XIANJIE
XU JINQING
HU BIN
WEN XIANSHI

Assignees

广东美的制冷设备有限公司
美的集团股份有限公司

Dates

Publication Date: 20260512
Application Date: 20200722

Claims (11)

1. Totem pole power factor correction circuit, characterized by comprising: The rectification module comprises an input end and an output end, wherein the input end is connected with an alternating current power supply, and the output end is used for being connected with a load; the rectifying module further comprises a first switching unit and a second switching unit, the first switching unit comprises a first power tube and a first diode, the first diode is in anti-parallel connection with the first power tube, the second switching unit comprises a second power tube and a second diode, the second diode is in anti-parallel connection with the second power tube, and the negative electrode of the second diode is connected with the positive electrode of the first diode; the reactor is arranged between the rectifying module and the alternating current power supply; a switch module; the capacitor module is connected with the output end and comprises a first capacitor and a second capacitor, the first capacitor is connected with the second capacitor in series, and a first connection point of the first capacitor and the second capacitor is connected with the alternating current power supply through the switch module; The control module is used for acquiring the load parameters under the condition that the voltage required by the load is more than twice of the alternating voltage peak value; if the load parameter is smaller than a first threshold value, controlling the rectifying module and the switching module to enable the totem pole power factor correction circuit to be switched to an uncontrolled rectifying mode; Or if the load parameter is greater than or equal to a first threshold value and less than a second threshold value, controlling the rectifying module and the switching module to enable the totem pole power factor correction circuit to be switched to a synchronous rectifying mode; the controlling the rectifying module and the switching module to switch the totem pole power factor correction circuit to a synchronous rectifying mode includes: Controlling the switch module to be conducted, determining that the input voltage of the rectifying module is in a positive half cycle and in a first time period after a voltage zero crossing point, controlling the first power tube to be conducted, and controlling the second power tube to be turned off so as to charge the first capacitor, wherein the first time period is the time when the current between the first power tube and the first diode is detected to be zero; And controlling the switch module to be conducted, determining that the input voltage of the rectifying module is in a negative half cycle and in a second time period after a voltage zero crossing point, controlling the second power tube to be conducted, and controlling the first power tube to be turned off so as to charge the second capacitor, wherein the second time period is the time when the second diode is detected to have current until the current is zero.
2. The totem pole power factor correction circuit of claim 1, wherein a negative pole of the first diode is connected to a first end of the first capacitor, a second end of the first capacitor is connected to a first end of the second capacitor, and a second end of the first capacitor is connected to one end of the AC power source through the switch module; the cathode of the second diode is connected with the anode of the first diode, the cathode of the second diode is connected with the other end of the alternating current power supply, and the anode of the second diode is connected with the second end of the second capacitor; The reactor is arranged between the cathode of the second diode and the alternating current power supply or between the second end of the first capacitor and the alternating current power supply.
3. The totem pole power factor correction circuit of claim 2, wherein the rectification module further comprises a first power diode and a second power diode; The positive electrode of the first power diode is connected with the negative electrode of the first diode, the negative electrode of the first power diode is connected with the first end of the first capacitor, the positive electrode of the second power diode is connected with the second end of the second capacitor, and the negative electrode of the second power diode is connected with the positive electrode of the second diode.
4. The totem pole power factor correction circuit of any of claims 1-3, wherein the switching module comprises a relay or a switching tube unit; The switching tube unit comprises a third power diode, a fourth power diode, a fifth power diode, a sixth power diode and a first switching tube, wherein the third power diode and the fourth power diode are connected in series to form a first power diode branch, the fifth power diode and the sixth power diode are connected in series to form a second power diode branch, the first switching tube, the first power diode branch and the second power diode branch are connected in parallel, the connection point of the third power diode and the fourth power diode is led out to serve as one end of the switching module, and the connection point of the fifth power diode and the sixth power diode is led out to serve as the other end of the switching module; Or the switching tube unit comprises a second switching tube and a third switching tube which are connected in parallel in an anti-parallel manner; or the switching tube unit comprises a fourth switching tube and a fifth switching tube which are connected in reverse series, and the fourth switching tube and the fifth switching tube are connected in reverse parallel with a power diode.
5. A control method applied to the totem pole power factor correction circuit of any of claims 1-4, the control method comprising the steps of: acquiring the load parameter under the condition that the voltage required by the load is more than twice of the alternating voltage peak value; Determining that the load parameter is smaller than a first threshold value, and controlling the rectifying module and the switching module to enable the totem pole power factor correction circuit to be switched to an uncontrolled rectifying mode; Or determining that the load parameter is larger than or equal to a first threshold value and smaller than a second threshold value, and controlling the rectifying module and the switching module to enable the totem pole power factor correction circuit to be switched to a synchronous rectifying mode; The control of the rectifying module and the switching module enables the totem pole power factor correction circuit to be switched to a synchronous rectifying mode, and the control method comprises the following steps: Controlling the switch module to be conducted, determining that the input voltage of the rectifying module is in a positive half cycle and in a first time period after a voltage zero crossing point, controlling the first power tube to be conducted, and controlling the second power tube to be turned off so as to charge the first capacitor, wherein the first time period is the time when the current between the first power tube and the first diode is detected to be zero; And controlling the switch module to be conducted, determining that the input voltage of the rectifying module is in a negative half cycle and in a second time period after a voltage zero crossing point, controlling the second power tube to be conducted, and controlling the first power tube to be turned off so as to charge the second capacitor, wherein the second time period is the time when the second diode is detected to have current until the current is zero.
6. The control method according to claim 5, wherein said controlling the totem pole power factor correction circuit to switch to the uncontrolled rectifying mode comprises the steps of: and controlling the first power tube and the second power tube to be turned off and controlling the switch module to be turned on.
7. The control method according to any one of claims 5 to 6, wherein the rectifying module further includes a third switching unit and a fourth switching unit, the first switching unit and the second switching unit are connected in series to form a first branch, the third switching unit and the fourth switching unit are connected in series to form a second branch, the first branch and the second branch are connected in parallel, and a common terminal of the third switching unit and the fourth switching unit is connected to a second terminal of the first capacitor through the switching module, the control method further comprising the steps of: and controlling the third switch unit and the fourth switch unit to be turned off.
8. The method according to claim 5-6, wherein the load parameter comprises at least one of a load current, a load power, a load operating pressure, and a load frequency.
9. An apparatus, comprising: At least one processor; at least one memory for storing at least one program; the at least one program, when executed by the at least one processor, causes the at least one processor to implement the control method of any one of claims 5-8.
10. An apparatus, comprising: A load; The load being driven by the device of claim 9.
11. A storage medium storing a program which, when executed by a processor, is adapted to carry out the control method according to any one of claims 5-8.

Description

Totem pole power factor correction circuit, control method, device and equipment Technical Field The invention relates to the technical field of control, in particular to a totem pole power factor correction circuit, a control method, a control device and equipment. Background In the existing electronic power technology, in order to obtain a higher power factor, a PFC (Power Factor Correction ) circuit is commonly used to provide a bus voltage. Some existing totem pole PFC circuits have a boosting effect, and can boost the voltage of the rectified output, but when the voltage needs to be doubled for output, that is, the output voltage is twice of the input voltage, the output cannot be achieved, and the output cannot be adjusted according to the load requirement under the doubled voltage output, so that the output of the totem pole PFC circuit is not matched with the load parameter, and the circuit efficiency is affected. Disclosure of Invention The embodiment of the application provides a totem pole power factor correction circuit, a control method, a control device and equipment, which can ensure the circuit efficiency of the totem pole power factor correction circuit. According to a first aspect of an embodiment of the present application, there is provided a totem pole power factor correction circuit, including: the rectification module comprises an input end and an output end, wherein the input end is connected with an alternating current power supply, and the output end is used for being connected with a load; the reactor is arranged between the rectifying module and the alternating current power supply; a switch module; the capacitor module is connected with the output end and comprises a first capacitor and a second capacitor, the first capacitor is connected with the second capacitor in series, and a first connection point of the first capacitor and the second capacitor is connected with the alternating current power supply through the switch module; and the control module is used for controlling the rectifying module and the switching module according to the load parameters of the load, so that the totem pole power factor correction circuit is switched to a synchronous rectifying mode or an uncontrolled rectifying mode. According to the embodiment of the application, the rectifying module can be controlled according to the load parameter, so that the totem pole power factor correction circuit is switched to the synchronous rectifying mode or the uncontrolled rectifying mode, and the loss and the resource can be reduced and the circuit efficiency can be ensured under the condition that the load parameter changes. Optionally, in one embodiment of the present application, the rectifying module includes a switching module, a first switching unit, and a second switching unit; The first switch unit comprises a first power tube and a first diode, the first diode is in anti-parallel connection with the first power tube, and the negative electrode of the first diode is connected with the first end of the first capacitor; the second end of the first capacitor is connected with the first end of the second capacitor, and the second end of the first capacitor is connected with one end of the alternating current power supply through the switch module; The second switch unit comprises a second power tube and a second diode, the second diode is in anti-parallel connection with the second power tube, the negative electrode of the second diode is connected with the positive electrode of the first diode, the negative electrode of the second diode is connected with the other end of the alternating current power supply, and the positive electrode of the second diode is connected with the second end of the second capacitor; The reactor is arranged between the cathode of the second diode and the alternating current power supply or between the second end of the first capacitor and the alternating current power supply. In the embodiment of the application, the first switch unit comprises a first power tube and a first diode, and the second switch unit comprises a second power tube and a second diode, so that different flow paths can be provided for the input current of the rectifying module, and a foundation is provided for a synchronous rectifying mode or an uncontrolled rectifying mode. Optionally, in one embodiment of the present application, the rectifying module further includes a first power diode and a second power diode; The positive electrode of the first power diode is connected with the negative electrode of the first diode, the negative electrode of the first power diode is connected with the first end of the first capacitor, the positive electrode of the second power diode is connected with the second end of the second capacitor, and the negative electrode of the second power diode is connected with the positive electrode of the second diode. In the embodiment of the application, the first power diode and the