CN210246600U - Correction control module of power factor correction circuit - Google Patents
Correction control module of power factor correction circuit Download PDFInfo
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- CN210246600U CN210246600U CN201921545157.7U CN201921545157U CN210246600U CN 210246600 U CN210246600 U CN 210246600U CN 201921545157 U CN201921545157 U CN 201921545157U CN 210246600 U CN210246600 U CN 210246600U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
A correction control module of a power factor correction circuit comprises a current sampling unit, an adjusting unit and a control unit. The current sampling unit generates a sampling current based on the work of a power factor correction circuit, the adjusting unit is connected with the current sampling unit and receives the sampling current, the adjusting unit consists of a resistance value fixing branch and a resistance value variable branch connected with the resistance value fixing branch in parallel, and the resistance value variable branch and the resistance value fixing branch receive the current to generate a node voltage. The control unit controls the resistance value of the resistance value variable branch circuit based on an input voltage and an output voltage of the power factor correction circuit, so that an equivalent resistance value of the resistance value variable branch circuit and the resistance value fixed branch circuit is changed according to the working state of the power factor correction circuit, and the node voltage is not influenced by the input voltage.
Description
Technical Field
The utility model relates to a power factor correction circuit's correction control module.
Background
The control of the power factor correction circuit is mainly performed by a correction control module, as shown in patents such as TWI459696, TW I466428, TW I590574 and CN1753290, etc., the correction control module is mainly based on the input voltage, the output voltage and the operating current of the power factor correction circuit as the basis of power factor adjustment, but because the input voltage of the power factor correction circuit used in the present power supply is up to 380V, the operating current of the power factor correction circuit is small, and the current mode of the conventional correction control module will cause that the operating current is small, the power factor control and the current harmonic distortion cannot be effectively improved.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main objective lies in solving the current problem that correction control module can't make power factor and electric current harmonic distortion can't effectively be improved according to current adjustment circuit parameter.
To achieve the above object, the present invention provides a correction control module of a power factor correction circuit, comprising: the current sampling unit generates a sampling current based on the work of a power factor correction circuit; the adjusting unit is connected with the current sampling unit and receives the sampling current, and consists of a resistance value fixed branch and a resistance value variable branch connected with the resistance value fixed branch in parallel, wherein the resistance value variable branch comprises a first field effect transistor, and the resistance value variable branch and the resistance value fixed branch receive the sampling current to generate a node voltage; and the control unit is connected with the power factor correction circuit and the adjusting unit to obtain the node voltage, an input voltage and an output voltage, the control unit generates a control signal based on the input voltage and the output voltage, the control signal is output to a grid electrode of the first field effect transistor, the first field effect transistor works in a linear mode to change an equivalent resistance value of the variable resistance branch and the fixed resistance branch, and the node voltage is not influenced by the size of the input voltage.
In one embodiment, the control unit has a node voltage input terminal and a reference potential connection terminal, one of the parallel nodes of the resistance variable branch and the resistance fixed branch is connected to the node voltage input terminal, and the other parallel node is connected to the reference potential connection terminal.
In one embodiment, the variable resistance branch comprises a first resistor connected in series with the first field effect transistor, and the fixed resistance branch comprises at least one second resistor.
In one embodiment, the power factor correction circuit includes an input capacitor, the current sampling unit includes at least a third resistor connected to the negative terminal of the input capacitor and an operational amplifier having a positive input terminal connected to the third resistor at a terminal not connected to the input capacitor, a negative input terminal connected to the third resistor and the negative terminal of the input capacitor, and an output terminal connected to the adjusting unit.
In one embodiment, the power factor correction circuit includes a second field effect transistor, and the current sampling unit includes a first current transformer and a first diode, the first current transformer has a first winding connected in series with a drain of the second field effect transistor and a second winding magnetically coupled with the first winding and connected with the first diode.
In one embodiment, the power factor correction circuit includes an output capacitor, a second diode connected to the output capacitor, a cathode of the second diode being connected to an anode of the output capacitor, the current sampling unit includes a second current transformer and a third diode, the second current transformer has a third winding connected in series to the anode of the second diode and a fourth winding magnetically coupled to the third winding and connected to the third diode.
Through the utility model discloses aforementioned, it is shown to compare in having following characteristics in the current: the utility model discloses this first field effect transistor changes the resistance according to this control signal's control, makes the variable branch road resistance of this resistance change, makes this variable branch road of resistance and this equivalent resistance of the fixed branch road of this resistance change. Therefore, when the power factor correction circuit is input at high voltage, the sampling current of the correction control module does not affect the node voltage even though the sampling current is reduced, so that the generation of current harmonic distortion is avoided, and the power factor correction of the power factor correction circuit is optimized.
Drawings
Fig. 1 is a schematic composition diagram of an embodiment of the present invention.
Fig. 2 is a schematic circuit diagram according to an embodiment of the present invention.
Fig. 3 is a circuit diagram (a) according to another embodiment of the present invention.
Fig. 4 is a circuit diagram (ii) according to another embodiment of the present invention.
Fig. 5 is a circuit diagram (iii) according to another embodiment of the present invention.
Fig. 6 is a circuit diagram (iv) according to another embodiment of the present invention.
Detailed Description
The detailed description and technical contents of the present invention are described as follows with reference to the drawings:
referring to fig. 1, the present invention provides a calibration control module 100, wherein the calibration control module 100 controls the operation of a power factor correction circuit 200 based on feedback information of the power factor correction circuit 200. The pfc circuit 200 may be configured in a power supply module and is known to those skilled in the art, and is not described herein. In addition, the calibration control module 100 includes a current sampling unit 11, an adjusting unit 13, and a control unit 14. The current sampling unit 11 is connected to the pfc circuit 200, and generates a sampling current 110 based on the operation of the pfc circuit 200, and the adjusting unit 13 is connected to the current sampling unit 11 and receives the sampling current 110, further, the adjusting unit 13 is composed of a resistance value fixing branch 131 and a resistance value variable branch 132 connected in parallel to the resistance value fixing branch 131, and the resistance value variable branch 132 includes a first field effect transistor 133. In addition, the variable resistance branch 132 and the fixed resistance branch 131 generate an equivalent resistance, and after receiving the sampling current 110, the variable resistance branch 132 and the fixed resistance branch 131 generate a node voltage 134 at a parallel node.
On the other hand, the control unit 14 can be implemented by an Integrated Circuit (IC), and the control unit 14 is connected to the pfc Circuit 200 and the adjusting unit 13 to obtain the node voltage 134, an input voltage 21 and an output voltage 22. The control unit 14 is directly connected to an input point and an output point of the pfc circuit 200 to obtain the input voltage 21 and the output voltage 22. Furthermore, referring to fig. 2, the control unit 14 uses the node voltage 134 as a control reference to provide a pulse width modulation signal 142 (i.e. PWM signal) to a second fet 23 of the pfc circuit 200 via a control signal output terminal 141 for active power factor adjustment. In addition, the control unit 14 of the present invention further generates a control signal 143 based on the input voltage 21 and the output voltage 22, wherein the control signal 143 is a signal generated based on the pwm technique, but the control signal 143 is different from the pwm signal 142, the former controls the first field effect transistor 133, and the latter controls the second field effect transistor 23.
Accordingly, the control signal 143 is output to a gate 135 of the first field effect transistor 133, the first field effect transistor 133 is controlled by the control signal 143 and then operates in a linear mode (or an ohm mode), the first field effect transistor 133 changes the resistance value according to the control of the control signal 143, so that the resistance value of the variable resistance branch 132 is changed, and the equivalent resistance values of the variable resistance branch 132 and the fixed resistance branch 131 are changed. Therefore, when the pfc control module 100 receives the high voltage input from the pfc circuit 200, the sampling current 110 does not affect the node voltage even though it is small, so as to avoid the generation of current harmonic distortion, and optimize the pfc of the pfc circuit 200.
Referring to fig. 1 and fig. 2, in an embodiment, the control unit 14 has a node voltage input terminal 144 and a reference potential connection terminal 145, one parallel node of the resistance variable branch 132 and the resistance fixed branch 131 is connected to the node voltage input terminal 144, and the other parallel node is connected to the reference potential connection terminal 145. In addition, in one embodiment, the variable resistance branch 132 includes a first resistor 136 connected in series with the first fet 133, the fixed resistance branch 131 includes at least a second resistor 137, and the first resistor 136 and the second resistor 137 are fixed resistance components.
Referring to fig. 2 again, an implementation structure of an embodiment of the current sampling unit 11 is described herein. The pfc circuit 200 comprises an input capacitor 24, the current sampling unit 11 comprises at least a third resistor 111 connected to the negative terminal of the input capacitor 24 and an operational amplifier 112, the operational amplifier 112 has a positive input terminal 113 connected to the third resistor 111 and not connected to the input capacitor 24, a negative input terminal 114 connected to the third resistor 111 and the negative terminal of the input capacitor 24, and an output terminal 115 connected to the adjusting unit 13. Accordingly, the operation principle of the operational amplifier 112 is well known to those skilled in the art, and will not be described herein. In addition, the current sampling unit 11 of the present invention is not limited to the above, please refer to fig. 3, in another embodiment, the current sampling unit 11 includes a first current transformer 116 and a first diode 117, the first current transformer 116 has a first winding 118 connected in series to the Drain (Drain) of the second field effect transistor 23 and a second winding 119 coupled to the first winding 118 and connected to the first diode 117. Referring to fig. 4, in an embodiment, the power factor correction circuit 200 includes an output capacitor 25, a second diode 26 connected to the output capacitor 25, a cathode of the second diode 26 is connected to an anode of the output capacitor 25, the current sampling unit 11 includes a second current transformer 120 and a third diode 121, the second current transformer 120 has a third winding 122 connected in series to an anode of the second diode 26, and a fourth winding 123 magnetically coupled to the third winding 122 and connected to the third diode 121. Furthermore, the circuits shown in fig. 3 and fig. 4 of the present invention can be implemented together as shown in fig. 5, so that the control unit 14 can omit the mechanism of program operation.
Referring to fig. 6, the input voltage 21 is illustrated as an input of the pfc circuit 200, in one embodiment, the input voltage 21 refers to a voltage that the power supply module receives the commercial power to enter the subsequent circuit, the acquisition points refer to a first voltage acquisition point 27 and a second voltage acquisition point 28 shown in fig. 6, and the control unit 14 has two input terminals 146 and 147 respectively connected to the first voltage acquisition point 27 and the second voltage acquisition point 28.
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Claims (10)
1. A calibration control module for a power factor calibration circuit, comprising:
the current sampling unit generates a sampling current based on the work of a power factor correction circuit;
the adjusting unit is connected with the current sampling unit and receives the sampling current, and consists of a resistance value fixed branch and a resistance value variable branch connected with the resistance value fixed branch in parallel, wherein the resistance value variable branch comprises a first field effect transistor, and the resistance value variable branch and the resistance value fixed branch receive the sampling current to generate a node voltage; and
and the control unit is connected with the power factor correction circuit and the adjusting unit to obtain the node voltage, an input voltage and an output voltage, the control unit generates a control signal based on the input voltage and the output voltage, the control signal is output to a grid electrode of the first field effect transistor, the first field effect transistor works in a linear mode to change an equivalent resistance value of the variable resistance branch and the fixed resistance branch, and the node voltage is not influenced by the size of the input voltage.
2. The calibration control module of claim 1, wherein the control unit has a node voltage input terminal and a reference potential connection terminal, one of the parallel nodes of the resistance variable branch and the resistance fixed branch is connected to the node voltage input terminal, and the other parallel node is connected to the reference potential connection terminal.
3. The calibration control module of the pfc circuit of claim 1 or 2, wherein the variable resistance branch comprises a first resistor connected in series with the first fet, and the fixed resistance branch comprises at least a second resistor.
4. The calibration control module of claim 3, wherein the PFC circuit comprises an input capacitor, the current sampling unit comprises at least a third resistor connected to a negative terminal of the input capacitor, and an operational amplifier having a positive input terminal connected to a terminal of the third resistor not connected to the input capacitor, a negative input terminal connected to the third resistor and the negative terminal of the input capacitor, and an output terminal connected to the adjustment unit.
5. The calibration control module of claim 3, wherein the PFC circuit comprises a second FET, and the current sampling unit comprises a first current transformer having a first winding coupled in series with a drain of the second FET and a second winding magnetically coupled to the first winding and connected to a first diode.
6. The calibration control module of claim 5, wherein the PFC circuit comprises an output capacitor, a second diode connected to the output capacitor, a cathode of the second diode being connected to an anode of the output capacitor, the current sampling unit comprising a second current transformer having a third winding connected in series to the anode of the second diode and a fourth winding magnetically coupled to the third winding and connected to the third diode, and a third diode.
7. The calibration control module of claim 3, wherein the PFC circuit comprises an output capacitor, a second diode connected to the output capacitor, a cathode of the second diode being connected to an anode of the output capacitor, the current sampling unit comprising a second current transformer having a third winding connected in series to the anode of the second diode and a fourth winding magnetically coupled to the third winding and connected to the third diode, and a third diode.
8. The calibration control module of the pfc circuit of claim 1 or 2, wherein the pfc circuit comprises an input capacitor, the current sampling unit comprises at least a third resistor connected to the negative terminal of the input capacitor and an operational amplifier having a positive input terminal connected to the third resistor and to the input capacitor, a negative input terminal connected to the third resistor and to the negative terminal of the input capacitor, and an output terminal connected to the regulating unit.
9. The calibration control module of claim 1 or 2, wherein the PFC circuit comprises a second FET, and the current sampling unit comprises a first diode having a first winding coupled in series with a drain of the second FET and a second winding magnetically coupled to the first winding and coupled to the first diode.
10. The calibration control module of claim 9, wherein the pfc circuit comprises an output capacitor, a second diode connected to the output capacitor, a cathode of the second diode being connected to an anode of the output capacitor, the current sampling unit comprising a second current transformer having a third winding connected in series to the anode of the second diode and a fourth winding magnetically coupled to the third winding and connected to the third diode, and a third diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921545157.7U CN210246600U (en) | 2019-09-17 | 2019-09-17 | Correction control module of power factor correction circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921545157.7U CN210246600U (en) | 2019-09-17 | 2019-09-17 | Correction control module of power factor correction circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210246600U true CN210246600U (en) | 2020-04-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921545157.7U Active CN210246600U (en) | 2019-09-17 | 2019-09-17 | Correction control module of power factor correction circuit |
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| Country | Link |
|---|---|
| CN (1) | CN210246600U (en) |
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2019
- 2019-09-17 CN CN201921545157.7U patent/CN210246600U/en active Active
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