PFC (Power Factor Correction) control circuit with protection

Abstract

The utility model discloses a PFC (Power Factor Correction) control circuit with protection, which is characterized by further comprising an MOS (Metal Oxide Semiconductor) tube driving circuit connected with a triode driving circuit and a voltage detection circuit connected with the MOS tube driving circuit, and the MOS tube driving circuit and the voltage detection circuit are respectively connected with a PFC driving circuit; according to the hardware detection overvoltage and overcurrent protection circuit, an MOS tube Q3 is driven by PWM to work through arrangement of an MOS tube driving circuit, 311V voltage is boosted to 385V voltage, and when voltage on a sampling resistor RS1 is smaller than preset voltage, a PFC driving circuit outputs the 385V voltage; and when the voltage on the sampling resistor RS1 exceeds the preset voltage, the voltage is fed back to the CS end of the PFC driving circuit, and the PFC driving output is closed, so that the purpose of over-current turn-off output is achieved, the MOS tube Q3 is protected from over-current breakdown, and the electronic device is protected from being damaged.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy vehicles, in particular to a protected PFC control circuit. Background Technique

[0002] At present, in the field of new energy vehicles, in order to meet safety specifications and strengthen the protection of electronic devices, more and more electronic devices need to be equipped with protected PFC control circuits. However, the current PFC circuits may cause damage to electronic components when overvoltage or overcurrent occurs for a long time. Therefore, a protected PFC control circuit is proposed. Content of the Utility Model

[0003] The main purpose of the utility model is to provide a solution that can effectively solve the problems in the background technique.

[0004] To achieve the above purpose, the technical solution adopted by the utility model is as follows: A protected PFC control circuit includes a PFC enable circuit, a PFC drive circuit connected to the PFC enable circuit, and a triode drive circuit connected to the PFC drive circuit. It is characterized in that it further includes a MOS tube drive circuit connected to the triode drive circuit and a voltage detection circuit connected to the MOS tube drive circuit, and the MOS tube drive circuit and the voltage detection circuit are also respectively connected to the PFC drive circuit; the voltage detection circuit includes a resistor R16, a resistor R20, a resistor R22, a resistor R23 connected in series in turn with the 385V power supply terminal, and a resistor R25, a resistor R24, and a capacitor C9 connected to the resistor R23 and connected to the PFC drive circuit, and the capacitor C9, the resistor R24, and the resistor R25 are grounded; the MOS tube drive circuit includes a MOS tube Q3, a sampling resistor RS1 connected to the MOS tube Q3 and connected to the PFC drive circuit, the other end of the sampling resistor RS1 is connected to alternating current, an inductor L1 and a diode D5 connected to the MOS tube Q3, a capacitor CX1 and a diode D4 connected to the other end of the inductor L1, the other end of the capacitor CX1 is connected to alternating current, a diode D4, a resistor R15, a capacitor CE2, and a capacitor CE3 connected to the diode D5, and the diode D4, the diode D5, the resistor R15, the capacitor CE3, and the capacitor CE2 are also connected to the 385V power supply terminal, a resistor R18 and a resistor R21 connected in series in turn with the resistor R15, and the resistor R21, the capacitor CE2, the capacitor CE3, the MOS tube Q3, and the sampling resistor RS1 are grounded, and the MOS tube Q3 is connected to the triode drive circuit.

[0005] Preferably, the PFC enabling circuit includes an optocoupler U2, a resistor R19 connected to the PFC driving circuit and the optocoupler U2, a capacitor C8 connected to the resistor R19, a resistor R17 connected to the optocoupler U2, resistors R14, R13, and R11 connected in series in sequence with the resistor R17, a VIN power supply terminal, a diode D2, and a resistor R12 connected to the other end of the resistor R11, a diode D3 connected to the resistor R12, and the diodes D2 and D3 are connected to the alternating current. The capacitor C8, the resistor R12, and the optocoupler U2 are grounded.

[0006] Preferably, the PFC driving circuit includes a controller and a voltage regulator block U1, resistors R8, R9, and a capacitor C7 connected to the PFC enabling circuit and the controller and the voltage regulator block U1, a capacitor C2 and a resistor R5 connected to the controller and the voltage regulator block U1, a resistor R7 connected to the controller and the voltage regulator block U1, a capacitor C1 and a resistor R4 connected to the other end of the resistor R7, a MOS transistor driving circuit connected to the other end of the resistor R4, and the capacitor C1, the resistor R5, the capacitor C2, the controller, and the voltage regulator block U1 are grounded, a triode driving circuit connected to the controller and the voltage regulator block U1, a capacitor C3 and a resistor R6 connected to the controller and the voltage regulator block U1, and the other end of the capacitor C3 is grounded, a capacitor CE1, a capacitor C4, and a 12V power supply terminal connected to the resistor R6, capacitors C6 and C5 connected to the controller and the voltage regulator block U1, an R10 connected to the other end of the capacitor C5, a voltage detection circuit connected to the controller and the voltage regulator block U1. The resistors R9, the capacitor C7, the capacitor C6, the resistor R10, the capacitor CE1, and the capacitor C4 are grounded.

[0007] Preferably, the triode driving circuit includes a triode Q1, a triode Q2 connected to the triode Q1, a resistor R1 connected to the PFC driving circuit and the triode Q1 and the triode Q2, a 12V power supply terminal connected to the triode Q1, the triode Q2, a resistor R3, and a diode D1 connected to the triode Q1, and the triode Q2 is grounded, a resistor R3, a diode Z1, a resistor R2, and a MOS transistor driving circuit connected to the diode D1, and the diode Z1 is grounded.

[0008] The utility model has the following beneficial effects: This circuit is a hardware detection overvoltage and overcurrent protection circuit. Through the setting of the MOS tube drive circuit, the PWM drives the MOS tube Q3 to work, boosting the 311V voltage to 385V. When the voltage on the sampling resistor RS1 is less than the preset voltage, the PFC drive circuit outputs 385V voltage; when the voltage on the sampling resistor RS1 exceeds the preset voltage, the voltage is fed back to the CS terminal of the PFC drive circuit to turn off the PFC drive output, achieving the purpose of turning off the output under overcurrent condition, protecting the MOS tube Q3 from being broken down by overcurrent, and thus protecting the electronic devices from being damaged; through the setting of the voltage detection circuit, when it detects a voltage less than the preset voltage, the PFC drive circuit outputs normally. When the voltage exceeds the preset voltage, the voltage is fed back to the FB terminal of the PFC drive circuit to turn off the PFC drive output, achieving the purpose of turning off the output under overvoltage condition, protecting the MOS tube Q3 from being broken down by overvoltage, and thus protecting the electronic devices from being damaged;

[0009] Through the setting of the PFC usage circuit, the MCU outputs a low level to control that the optocoupler U2 cannot be turned on, so that the output of the optocoupler U2 does not pull down the enable signal;

[0010] Through the setting of the PFC drive circuit, when receiving the low-level enable signal output by the PFC enable circuit, the PFC drive stops working. When receiving a non-low-level signal, it enables the PFC drive to output a PWM signal, so that both overvoltage and overcurrent stop output, protecting the MOS tube Q3 from being broken down by overvoltage and overcurrent;

[0011] Through the setting of the triode drive circuit, the triode drive circuit receives the PWM signal output by the PFC drive circuit and amplifies the voltage to drive the MOS tube Q3 to work. Description of the Drawings

[0012] Figure 1 is the circuit principle block diagram of the utility model;

[0013] Figure 2 is the circuit diagram of the PFC enable circuit of the utility model;

[0014] Figure 3 is the circuit diagram of the PFC drive circuit of the utility model;

[0015] Figure 4 is the circuit diagram of the triode drive circuit of the utility model;

[0016] Figure 5 The circuit diagram of the MOS tube drive circuit of the utility model;

[0017] Figure 6 The circuit diagram of the voltage detection circuit of the utility model.

[0018] Legend: 1. PFC enabling circuit; 2. PFC driving circuit; 3. Triode driving circuit; 4. MOS transistor driving circuit; 5. Voltage detection circuit. Detailed implementation manners

[0019] To make the technical means, creative features, achieved purposes and effects of the present utility model easy to understand, the present utility model will be further described below in conjunction with specific implementation manners.

[0020] As Figure 1-6As shown in the figure, a protected PFC control circuit includes a PFC enabling circuit 1, a PFC driving circuit 2 connected to the PFC enabling circuit 1, and a triode driving circuit 3 connected to the PFC driving circuit 2. It is characterized in that: it further includes a MOS tube driving circuit 4 connected to the triode driving circuit 3, and a voltage detection circuit 5 connected to the MOS tube driving circuit 4, and the MOS tube driving circuit 4 and the voltage detection circuit 5 are also respectively connected to the PFC driving circuit 2; the voltage detection circuit 5 includes a resistor R16, a resistor R20, a resistor R22, a resistor R23 connected in series in sequence with the 385V power supply terminal, and a resistor R25, a resistor R24, and a capacitor C9 connected to the resistor R23 and connected to the PFC driving circuit 2, and the capacitor C9, the resistor R24, and the resistor R25 are grounded; the MOS tube driving circuit 4 includes a MOS tube Q3, a sampling resistor RS1 connected to the MOS tube Q3 and connected to the PFC driving circuit 2, the other end of the sampling resistor RS1 is connected to alternating current, an inductor L1 and a diode D5 connected to the MOS tube Q3, a capacitor CX1 and a diode D4 connected to the other end of the inductor L1, the other end of the capacitor CX1 is connected to alternating current, a diode D4, a resistor R15, a capacitor CE2, and a capacitor CE3 connected to the diode D5, and the diode D4, the diode D5, the resistor R15, the capacitor CE3, and the capacitor CE2 are also connected to the 385V power supply terminal, a resistor R18 and a resistor R21 connected in series in sequence with the resistor R15, and the resistor R21, the capacitor CE2, the capacitor CE3, the MOS tube Q3, and the sampling resistor RS1 are grounded, and the MOS tube Q3 is connected to the triode driving circuit 3; this circuit is a hardware detection overvoltage and overcurrent protection circuit. Through the setting of the MOS tube driving circuit 4, the PWM drives the MOS tube Q3 to work, boosts the 311V voltage to 385V voltage. When the voltage on the sampling resistor RS1 is less than the preset voltage, the PFC driving circuit 2 outputs 385V voltage; when the voltage on the sampling resistor RS1 exceeds the preset voltage, the voltage is fed back to the CS terminal of the PFC driving circuit 2, and the PFC driving output is turned off to achieve the purpose of overcurrent shutdown output, protecting the MOS tube Q3 from being broken down by overcurrent, thereby protecting the electronic devices from being damaged; through the setting of the voltage detection circuit 5, when the detected voltage is less than the preset voltage, the PFC driving circuit 2 outputs normally. When the voltage exceeds the preset voltage, the voltage is fed back to the FB terminal of the PFC driving circuit 2, and the PFC driving output is turned off to achieve the purpose of overvoltage shutdown output, protecting the MOS tube Q3 from being broken down by overvoltage, thereby protecting the electronic devices from being damaged.

[0021] In one embodiment, the PFC enabling circuit 1 includes an optocoupler U2, a resistor R19 connected to the PFC driving circuit 2 and the optocoupler U2, a capacitor C8 connected to the resistor R19, a resistor R17 connected to the optocoupler U2, resistors R14, R13, and R11 connected in series in sequence with the resistor R17, a VIN power supply terminal, a diode D2, and a resistor R12 connected to the other end of the resistor R11, a diode D3 connected to the resistor R12, and the diodes D2 and D3 are connected to an alternating current. The capacitor C8, the resistor R12, and the optocoupler U2 are grounded. Through the setting of the PFC usage circuit 1, the MCU outputs a low level to control that the optocoupler U2 cannot be turned on, so that the output of the optocoupler U2 does not pull down the enabling signal.

[0022] In one embodiment, the PFC driving circuit 2 includes a controller and a voltage regulator block U1, resistors R8, R9, and a capacitor C7 connected to the PFC enabling circuit 1 and the controller and the voltage regulator block U1, a capacitor C2 and a resistor R5 connected to the controller and the voltage regulator block U1, a resistor R7 connected to the controller and the voltage regulator block U1, a capacitor C1 and a resistor R4 connected to the other end of the resistor R7, a MOS tube driving circuit 4 connected to the other end of the resistor R4, and the capacitor C1, the resistor R5, the capacitor C2, the controller, and the voltage regulator block U1 are grounded, a triode driving circuit 3 connected to the controller and the voltage regulator block U1, a capacitor C3 and a resistor R6 connected to the controller and the voltage regulator block U1, and the other end of the capacitor C3 is grounded, a capacitor CE1, a capacitor C4, and a 12V power supply terminal connected to the resistor R6, capacitors C6 and C5 connected to the controller and the voltage regulator block U1, an R10 connected to the other end of the capacitor C5, a voltage detection circuit 5 connected to the controller and the voltage regulator block U1. The resistors R9, C7, C6, R10, CE1, and C4 are grounded. Through the setting of the PFC driving circuit 2, when receiving the low-level enabling signal output by the PFC enabling circuit 1, the PFC driving stops working. When receiving a non-low-level signal, the PFC driving is enabled to output a PWM signal, so that overvoltage and overcurrent outputs are both stopped to protect the MOS tube Q3 from being broken down by overvoltage and overcurrent.

[0023] In one embodiment, the triode driving circuit 3 includes triodes Q1 and Q2, a resistor R1 connected to the PFC driving circuit 2 and the triodes Q1 and Q2, a 12V power supply terminal connected to the triode Q1, the triode Q2, a resistor R3, and a diode D1 connected to the triode Q1, and the triode Q2 is connected to the power ground, a resistor R3, a diode Z1, a resistor R2, and a MOS tube driving circuit 4 connected to the diode D1. The diode Z1 is connected to the ground. Through the setting of the triode driving circuit 3, the triode driving circuit 3 receives the PWM signal output by the PFC driving circuit and amplifies the voltage to drive the MOS tube Q3 to work.

[0024] The working principle of the present utility model is as follows: The PFC enabling circuit 1 is connected to the PFC driving circuit 2. The PFC enabling low-level signal is isolated by the optocoupler U2 without pulling down the enabling signal. The power supply terminal VIN signal is introduced into the enabling terminal of the PFC driving circuit 2 after passing through a resistor to control the operation of the PFC driving circuit 2. The PFC driving circuit 2 is connected to the triode driving circuit 3. The PFC driving circuit 2 outputs a PWM to control the operation of the triode driving circuit 3, amplifying the driving ability. The triode driving circuit 3 is connected to the MOS tube driving circuit 4. The triode outputs a PWM to control the operation of the MOS tube Q3, boosting the 311V voltage to 385V. When the voltage on the sampling resistor RS1 is less than the preset voltage, the PFC driving circuit 2 outputs a 385V voltage. When the voltage on the sampling resistor RS1 exceeds the preset voltage, the voltage is fed back to the CS terminal of the PFC driving circuit 2 to turn off the PFC driving output for the purpose of overcurrent shutdown output. The MOS tube driving circuit 4 is connected to the voltage detection circuit 5. When the voltage detection circuit 5 detects a voltage less than the preset voltage, the PFC driving circuit 2 outputs normally. When the voltage exceeds the preset voltage, the voltage is fed back to the FB terminal of the PFC driving circuit 2 to turn off the PFC driving output for the purpose of overvoltage shutdown output.

[0025] The above has shown and described the basic principle, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A protected PFC control circuit, comprising a PFC enabling circuit (1), a PFC driving circuit (2) connected to the PFC enabling circuit (1), a triode driving circuit (3) connected to the PFC driving circuit (2), characterized in that: it further comprises a MOS tube driving circuit (4) connected to the triode driving circuit (3), a voltage detection circuit (5) connected to the MOS tube driving circuit (4), and the MOS tube driving circuit (4) and the voltage detection circuit (5) are also respectively connected to the PFC driving circuit (2); the voltage detection circuit (5) comprises a resistor R16, a resistor R20, a resistor R22, a resistor R23 connected in series in turn with the 385V power supply terminal, and a resistor R25, a resistor R24, a capacitor C9 connected to the resistor R23 and connected to the PFC driving circuit (2), and the capacitor C9, the resistor R24 and the resistor R25 are grounded; the MOS tube driving circuit (4) comprises a MOS tube Q3, a sampling resistor RS1 connected to the MOS tube Q3 and connected to the PFC driving circuit (2), the other end of the sampling resistor RS1 is connected to alternating current, an inductor L1, a diode D5 connected to the MOS tube Q3, a capacitor CX1, a diode D4 connected to the other end of the inductor L1, the other end of the capacitor CX1 is connected to alternating current, a diode D4, a resistor R15, a capacitor CE2, a capacitor CE3 connected to the diode D5, and the diode D4, the diode D5, the resistor R15, the capacitor CE3, the capacitor CE2 are also connected to the 385V power supply terminal, a resistor R18, a resistor R21 connected in series in turn with the resistor R15, and the resistor R21, the capacitor CE2, the capacitor CE3, the MOS tube Q3, the sampling resistor RS1 are grounded, and the MOS tube Q3 is connected to the triode driving circuit (3).

2. The protected PFC control circuit according to claim 1, wherein: The PFC enabling circuit (1) comprises an optocoupler U2, a resistor R19 connected to the PFC driving circuit (2) and connected to the optocoupler U2, a capacitor C8 connected to the resistor R19, a resistor R17 connected to the optocoupler U2, a resistor R14, a resistor R13, a resistor R11 connected in series in turn with the resistor R17, a VIN power supply terminal, a diode D2 and a resistor R12 connected to the other end of the resistor R11, a diode D3 connected to the resistor R12, and the diode D2, the diode D3 are connected to alternating current, and the capacitor C8, the resistor R12, the optocoupler U2 are grounded.

3. The protected PFC control circuit according to claim 1, characterized in that: The described PFC driving circuit (2) includes a controller and a voltage regulator block U1, a resistor R8, a resistor R9, and a capacitor C7 that are connected to the PFC enabling circuit (1) and are also connected to the controller and the voltage regulator block U1, a capacitor C2 and a resistor R5 that are connected to the controller and the voltage regulator block U1, a resistor R7 that is connected to the controller and the voltage regulator block U1, a capacitor C1 and a resistor R4 that are connected to the other end of the resistor R7, a MOS transistor driving circuit (4) that is connected to the other end of the resistor R4, and the capacitor C1, the resistor R5, the capacitor C2, the controller, and the voltage regulator block U1 are grounded. There is a triode driving circuit (3) that is connected to the controller and the voltage regulator block U1, a capacitor C3 and a resistor R6 that are connected to the controller and the voltage regulator block U1, and the other end of the capacitor C3 is grounded. There are a capacitor CE1, a capacitor C4, and a 12V power supply terminal that are connected to the resistor R6, a capacitor C6 and a capacitor C5 that are connected to the controller and the voltage regulator block U1, an R10 that is connected to the other end of the capacitor C5, a voltage detection circuit (5) that is connected to the controller and the voltage regulator block U1. The resistor R9, the capacitor C7, the capacitor C6, the resistor R10, the capacitor CE1, and the capacitor C4 are grounded.

4. A protected PFC control circuit according to claim 1, characterized in that: The described triode driving circuit (3) includes a triode Q1, a triode Q2 that is connected to the triode Q1, a resistor R1 that is connected to the PFC driving circuit (2) and is also connected to the triode Q1 and the triode Q2, a 12V power supply terminal that is connected to the triode Q1, the triode Q2, a resistor R3, and a diode D1 that are connected to the triode Q1, and the triode Q2 is grounded. There are a resistor R3, a diode Z1, a resistor R2, and a MOS transistor driving circuit (4) that are connected to the diode D1, and the diode Z1 is grounded.

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