Non-isolated EC motor control circuit

Abstract

The utility model belongs to the technical field of control circuits, and particularly relates to a non-isolated EC motor control circuit. The circuit comprises an AC input circuit, a rectification circuit, a DC-DC BUCK step-down circuit, an MCU main control circuit, an IPM power control circuit and a HALL induction circuit. The MCU main control circuit is respectively connected with the HALL induction circuit, the IPM circuit, the bus voltage detection circuit and the DC-DC BUCK step-down circuit, the AC input circuit is connected with the rectification circuit, and the rectification circuit is respectively connected with the DC-DC BUCK step-down circuit, the bus voltage detection circuit and the IPM circuit. Control signals received by the IPM power control circuit are two paths of IPM reverse driving signals and two paths of IPM forward driving signals. The non-isolated EC motor control circuit is used for solving the problem that the compatible voltage range in the existing non-isolated EC motor control is narrow.

Description

Technical Field

[0001] The utility model belongs to the technical field of control circuits, and in particular relates to a non-isolated EC motor control circuit. Background Art

[0002] Many large-capacity fans currently use variable frequency drive (VFD) to adjust air volume. These VFDs are primarily imported and expensive. Fans with power ratings below 1 kW, particularly those used in household air conditioners, are driven by EC motors and use variable speed drive to adjust air volume.

[0003] Generally, EC motors use non-isolated control circuits and isolated control circuits. However, existing non-isolated control circuits have problems such as poor compatibility with a wide voltage range, low integration, and complex peripheral circuits.

[0004] The utility model proposes a non-isolated EC motor control circuit, which can reduce costs and increase efficiency while solving the above problems. Utility Model Content

[0005] The utility model provides a non-isolated EC motor control circuit, which is used to solve the problems of poor compatibility with wide voltage, low integration and complex peripheral circuits in existing non-isolated EC motor control.

[0006] The utility model is achieved through the following technical solutions:

[0007] A non-isolated EC motor control circuit, comprising an AC input circuit, a rectifier circuit, a DC-DC buck circuit, an MCU main control circuit, an IPM power control circuit, and a Hall sensing circuit;

[0008] The MCU main control circuit is connected to the HALL sensing circuit, IPM circuit, bus voltage detection circuit and DC-DCBUCK step-down circuit respectively.

[0009] The AC input circuit is connected to the rectifier circuit, and the rectifier circuit is connected to the DC-DC BUCK step-down circuit bus voltage detection circuit and the IPM circuit respectively.

[0010] The control signals received by the IPM power control circuit are two IPM reverse drive signals and two IPM forward drive signals.

[0011] Furthermore, the DC-DC BUCK step-down circuit includes a chip U1, terminal 2 of the chip U1 is connected to 310V, terminal 1 of the chip U1 is grounded, terminal 3 of the chip U1 is respectively connected to one end of the capacitor C20 and one end of the inductor L1, terminal 4 of the chip U1 is respectively connected to the other end of the capacitor C20 and the positive electrode of the Zener diode ZD1, the negative electrode of the Zener diode ZD1 is connected to the negative electrode of the diode D2, the positive electrode of the diode D2 is respectively connected to the other end of the inductor L1, one end of the capacitor C1, the positive end of the capacitor E5, the negative electrode of the diode D2 and the 12V output end, the other end of the capacitor C1, the negative end of the capacitor E5 and the positive electrode of the diode D2 are connected and then grounded.

[0012] Furthermore, the MCU main control circuit includes a chip IC1, wherein terminal 6 of the IC1 is connected to a DC15V terminal and one end of a capacitor C5, respectively; terminal 6 of the IC1 is connected to one end of a capacitor C6, one end of a capacitor C7, and a VDD5 terminal, respectively; and the other end of the capacitor C5 is connected to the other end of the capacitor C6 and the other end of the capacitor C7, respectively, and then grounded;

[0013] Terminal 6 of the IC1 is connected to one end of a resistor R6 and one end of a capacitor C8 respectively. The other end of the capacitor C8 is grounded. The other end of the resistor R6 is connected to the chip U4 of the IPM power control circuit.

[0014] Furthermore, the IPM power control circuit includes a chip U3, wherein the 26th terminal and the 1st terminal to the 7th terminal of the chip U3 are all connected to 310V, the 21st terminal to the 24th terminal of the chip U3 are all connected to the interface L2 and one end of the capacitor C10, the other end of the capacitor C10 is connected to the 9th terminal of the chip U3, the 11th terminal of the chip U3 is respectively connected to the 13th terminal of the chip U3, one end of the capacitor C9, the ground terminal, one end of the capacitor C11 and one end of the capacitor C12, and the 12th terminal of the chip U3 is respectively connected to the voltage 12V and the other end of the capacitor C9. The other end of the capacitor C11 is respectively connected to one end of the resistor R10 and terminal 14 of the chip U3, the other end of the capacitor C12 is respectively connected to one end of the resistor R9 and terminal 15 of the chip U3, terminal 17 of the chip U3 is connected to one end of the resistor R8, the other end of the resistor R8 is respectively connected to one end of the capacitor C13 and terminal 15 of the chip U1, the other end of the capacitor C13 is respectively connected to terminal 16 of the chip U3 and then to ground, terminal 18 of the chip U3 is connected to terminal 19 of the chip U3 and then to the COM terminal.

[0015] Furthermore, the IPM power control circuit includes a chip U4, wherein the 26th terminal and the 1st terminal to the 7th terminal of the chip U4 are all connected to 310V, the 21st terminal to the 24th terminal of the chip U4 are all connected to the interface L1 and one end of the capacitor C15, the other end of the capacitor C15 is connected to the 9th terminal of the chip U4, the 11th terminal of the chip U4 is respectively connected to the 13th terminal of the chip U4, one end of the capacitor C14, the ground terminal, one end of the capacitor C16 and one end of the capacitor C17, the 12th terminal of the chip U4 is respectively connected to the voltage 12V and the other end of the capacitor C14, the other end of the capacitor C16 is connected to the 12th terminal of the chip U4. They are respectively connected to one end of the resistor R11 and terminal 14 of the chip U4, the other end of the capacitor C17 is respectively connected to one end of the resistor R12 and terminal 15 of the chip U4, terminal 17 of the chip U4 is connected to one end of the resistor R13, the other end of the resistor R13 is respectively connected to one end of the capacitor C18 and terminal 12 of the chip U1, the other end of the capacitor C18 is respectively connected to terminal 16 of the chip U4 and then to ground, terminal 18 of the chip U4 is connected to terminal 19 of the chip U4 and then to the COM terminal, the other end of the resistor RS2, the other end of the resistor RS1 and the other end of the resistor R6;

[0016] The other end of the resistor R11 is connected to the IPM drive signal reverse circuit, and the other end of the resistor R12 is also connected to the IPM drive signal reverse circuit.

[0017] Furthermore, the IPM drive signal reverse circuit includes a transistor Q1, wherein terminal 1 of the transistor Q1 is connected to one end of the resistor R16 and the anode of the voltage stabilizing diode ZD3, respectively, and the cathode of the voltage stabilizing diode ZD3 is connected to terminal 2 of the chip IC1.

[0018] Terminal 2 of the transistor Q1 is connected to one end of the resistor R17 and the other end of the resistor R11 respectively, and the other end of the resistor R17 is connected to the VDD5 terminal;

[0019] Terminal 3 of the transistor Q1 is connected to the other end of the resistor R16 and then grounded.

[0020] Furthermore, the IPM drive signal reverse circuit includes a transistor Q2, wherein terminal 1 of the transistor Q2 is connected to one end of the resistor R15 and the anode of the voltage stabilizing diode ZD2, respectively, and the cathode of the voltage stabilizing diode ZD2 is connected to terminal 3 of the chip IC1.

[0021] Terminal 2 of the transistor Q2 is connected to one end of the resistor R14 and the other end of the resistor R12, respectively. The other end of the resistor R15 is connected to the VDD5 terminal.

[0022] Terminal 3 of the transistor Q2 is connected to the other end of the resistor R15 and then grounded.

[0023] Furthermore, the AC input rectifier circuit outputs a 310V voltage to power the bus voltage detection circuit and the IPM power control circuit.

[0024] The beneficial effects of the utility model are:

[0025] The utility model has high integration, reliable protection mode, protection against lightning and surge impact, compatibility with wide voltage operation, and convenient application.

[0026] The utility model has high circuit integration, obvious circuit cost advantage and high cost performance;

[0027] The utility model has simple peripheral circuits, small PCB layout area, convenient installation, and is particularly suitable for motors with smaller spaces; it also has multiple protections and high stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a circuit block diagram of the utility model.

[0029] Figure 2 This is the AC input rectification circuit diagram of the utility model.

[0030] Figure 3 This is the DC-DC BUCK step-down circuit diagram of the utility model.

[0031] Figure 4 This is the MCU main control circuit diagram of the utility model.

[0032] Figure 5 This is the IPM power control circuit diagram of the utility model.

[0033] Figure 6 This is the IPM drive signal reverse circuit diagram of the utility model.

[0034] Figure 7 This is a bus voltage detection circuit diagram of the utility model.

[0035] Figure 8 This is the IC output signal circuit diagram of the utility model. DETAILED DESCRIPTION

[0036] In the following description, specific details such as specific system structures and technologies are provided for illustration rather than limitation to facilitate a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid obstructing the description of the present application with unnecessary details.

[0037] It will be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0038] It should also be understood that the terms used in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0039] The following is a clear and complete description of the technical solutions in the embodiments of this application in conjunction with the drawings in the specification of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0040] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0041] A non-isolated EC motor control circuit, such as Figure 1 As shown, the circuit includes an AC input circuit, a rectifier circuit, a DC-DC BUCK step-down circuit, an MCU main control circuit, an IPM power control circuit and a HALL sensing circuit;

[0042] The MCU main control circuit is connected to the HALL sensing circuit, IPM circuit, bus voltage detection circuit and DC-DCBUCK step-down circuit respectively.

[0043] The AC input circuit is connected to the rectifier circuit, and the rectifier circuit is connected to the DC-DC BUCK step-down circuit bus voltage detection circuit and the IPM circuit respectively.

[0044] The control signals received by the IPM power control circuit are two IPM reverse drive signals and two IPM forward drive signals.

[0045] Furthermore, the DC-DC BUCK step-down circuit includes a chip U1, terminal 2 of the chip U1 is connected to 310V, terminal 1 of the chip U1 is grounded, terminal 3 of the chip U1 is respectively connected to one end of the capacitor C20 and one end of the inductor L1, terminal 4 of the chip U1 is respectively connected to the other end of the capacitor C20 and the positive electrode of the Zener diode ZD1, the negative electrode of the Zener diode ZD1 is connected to the negative electrode of the diode D2, the positive electrode of the diode D2 is respectively connected to the other end of the inductor L1, one end of the capacitor C1, the positive end of the capacitor E5, the negative electrode of the diode D2 and the 12V output end, the other end of the capacitor C1, the negative end of the capacitor E5 and the positive electrode of the diode D2 are connected and then grounded.

[0046] Specifically, the DC-DC BUCK step-down circuit converts the rectified high-voltage DC power into a low-voltage DC 12V. The 12V voltage is used to supply the main control MCU and the IPM bootstrap circuit.

[0047] Furthermore, the MCU main control circuit includes a chip IC1, wherein terminal 6 of the IC1 is connected to a DC15V terminal and one end of a capacitor C5, respectively; terminal 6 of the IC1 is connected to one end of a capacitor C6, one end of a capacitor C7, and a VDD5 terminal, respectively; and the other end of the capacitor C5 is connected to the other end of the capacitor C6 and the other end of the capacitor C7, respectively, and then grounded;

[0048] Terminal 6 of the IC1 is connected to one end of a resistor R6 and one end of a capacitor C8 respectively. The other end of the capacitor C8 is grounded. The other end of the resistor R6 is connected to the chip U4 of the IPM power control circuit.

[0049] Specifically, the drive control method is single-phase sensed square wave control. IC1 detects the high and low level digital signals output by the HALL sensor IC2, and continuously switches the high and low levels of the H_PU, H_PV, L_NU, and L_NV drive signals to change the switching state of the IPM modules U3 and U4, thereby changing the current direction of the motor stator coil and allowing the motor to continue running.

[0050] IC1 monitors the motor's operating current through R6 and C8. When the current exceeds the set protection threshold, the overcurrent protection is triggered and the motor stops running immediately to protect the electronic components from being damaged.

[0051] IC1 monitors the input voltage through R1, R2, R3, R24, and C3. When the input voltage exceeds the set protection threshold, the overvoltage protection is triggered and the motor stops running immediately to protect the electronic components from being damaged.

[0052] IC1 determines the motor's operating status by detecting the frequency of change in the output signal of the HALL sensor IC2 per unit time. When the frequency of the HALL output signal is lower than the set value, IC1 stops outputting the drive signal, putting the motor into a stall protection state. This protects the motor from being stopped by external forces by cutting off the current in the motor's stator coil and protecting the coil from being burned out by high temperatures.

[0053] Furthermore, the IPM power control circuit includes a chip U3, wherein the 26th terminal and the 1st terminal to the 7th terminal of the chip U3 are all connected to 310V, the 21st terminal to the 24th terminal of the chip U3 are all connected to the interface L2 and one end of the capacitor C10, the other end of the capacitor C10 is connected to the 9th terminal of the chip U3, the 11th terminal of the chip U3 is respectively connected to the 13th terminal of the chip U3, one end of the capacitor C9, the ground terminal, one end of the capacitor C11 and one end of the capacitor C12, and the 12th terminal of the chip U3 is respectively connected to the voltage 12V and the other end of the capacitor C9. The other end of the capacitor C11 is respectively connected to one end of the resistor R10 and terminal 14 of the chip U3, the other end of the capacitor C12 is respectively connected to one end of the resistor R9 and terminal 15 of the chip U3, terminal 17 of the chip U3 is connected to one end of the resistor R8, the other end of the resistor R8 is respectively connected to one end of the capacitor C13 and terminal 15 of the chip U1, the other end of the capacitor C13 is respectively connected to terminal 16 of the chip U3 and then to ground, terminal 18 of the chip U3 is connected to terminal 19 of the chip U3 and then to the COM terminal.

[0054] Furthermore, the IPM power control circuit includes a chip U4, wherein the 26th terminal and the 1st terminal to the 7th terminal of the chip U4 are all connected to 310V, the 21st terminal to the 24th terminal of the chip U4 are all connected to the interface L1 and one end of the capacitor C15, the other end of the capacitor C15 is connected to the 9th terminal of the chip U4, the 11th terminal of the chip U4 is respectively connected to the 13th terminal of the chip U4, one end of the capacitor C14, the ground terminal, one end of the capacitor C16 and one end of the capacitor C17, the 12th terminal of the chip U4 is respectively connected to the voltage 12V and the other end of the capacitor C14, the other end of the capacitor C16 is connected to the 12th terminal of the chip U4. They are respectively connected to one end of the resistor R11 and terminal 14 of the chip U4, the other end of the capacitor C17 is respectively connected to one end of the resistor R12 and terminal 15 of the chip U4, terminal 17 of the chip U4 is connected to one end of the resistor R13, the other end of the resistor R13 is respectively connected to one end of the capacitor C18 and terminal 12 of the chip U1, the other end of the capacitor C18 is respectively connected to terminal 16 of the chip U4 and then to ground, terminal 18 of the chip U4 is connected to terminal 19 of the chip U4 and then to the COM terminal, the other end of the resistor RS2, the other end of the resistor RS1 and the other end of the resistor R6;

[0055] The other end of the resistor R11 is connected to the IPM drive signal reverse circuit, and the other end of the resistor R12 is also connected to the IPM drive signal reverse circuit.

[0056] Specifically, U3 and U4 of the IPM power control circuit are unilateral IPM modules that integrate N+N high-voltage MOS and the upper bridge boost drive circuit. The circuit periphery only needs to be configured with bootstrap capacitors C10 and C15 to drive the switch of the upper bridge N_MOS; through the vot pin, the main control can monitor the temperature rise of the IPM module to protect the IPM module from being damaged by overheating.

[0057] Furthermore, the IPM drive signal reverse circuit includes a transistor Q1, wherein terminal 1 of the transistor Q1 is connected to one end of the resistor R16 and the anode of the voltage stabilizing diode ZD3, respectively, and the cathode of the voltage stabilizing diode ZD3 is connected to terminal 2 of the chip IC1.

[0058] Terminal 2 of the transistor Q1 is connected to one end of the resistor R17 and the other end of the resistor R11 respectively, and the other end of the resistor R17 is connected to the VDD5 terminal;

[0059] Terminal 3 of the transistor Q1 is connected to the other end of the resistor R16 and then grounded.

[0060] Furthermore, the IPM drive signal reverse circuit includes a transistor Q2, wherein terminal 1 of the transistor Q2 is connected to one end of the resistor R15 and the anode of the voltage stabilizing diode ZD2, respectively, and the cathode of the voltage stabilizing diode ZD2 is connected to terminal 3 of the chip IC1.

[0061] Terminal 2 of the transistor Q2 is connected to one end of the resistor R14 and the other end of the resistor R12, respectively. The other end of the resistor R15 is connected to the VDD5 terminal.

[0062] Terminal 3 of the transistor Q2 is connected to the other end of the resistor R15 and then grounded.

[0063] Furthermore, the AC input rectifier circuit outputs a 310V voltage to power the bus voltage detection circuit and the IPM power control circuit.

[0064] Specifically, the driving signal output by the main control U1 is inverted to prevent the upper and lower bridge MOS inside the IPM module from directly burning out, effectively preventing signal interference and making the circuit run more smoothly.

[0065] Figure 2 Includes AC input circuit and rectifier circuit.

[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the invention of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the invention of the present invention should be included in the scope of protection of the invention of the present invention.

Claims

1. A non-isolated EC motor control circuit, characterized in that: The circuit includes an AC input circuit, a rectifier circuit, a DC-DC BUCK step-down circuit, an MCU main control circuit, an IPM power control circuit and a HALL sensing circuit; The MCU main control circuit is connected to the HALL sensing circuit, IPM circuit, bus voltage detection circuit and DC-DC BUCK step-down circuit respectively. The AC input circuit is connected to the rectifier circuit, and the rectifier circuit is connected to the DC-DC BUCK step-down circuit bus voltage detection circuit and the IPM circuit respectively. The control signals received by the IPM power control circuit are two IPM reverse drive signals and two IPM forward drive signals.

2. The non-isolated EC motor control circuit according to claim 1, characterized in that: The DC-DC BUCK step-down circuit includes a chip U1, wherein terminal 2 of the chip U1 is connected to 310V, terminal 1 of the chip U1 is grounded, terminal 3 of the chip U1 is respectively connected to one end of the capacitor C20 and one end of the inductor L1, terminal 4 of the chip U1 is respectively connected to the other end of the capacitor C20 and the positive electrode of the Zener diode ZD1, the negative electrode of the Zener diode ZD1 is connected to the negative electrode of the diode D2, the positive electrode of the diode D2 is respectively connected to the other end of the inductor L1, one end of the capacitor C1, the positive end of the capacitor E5, the negative electrode of the diode D2, and the 12V output end, the other end of the capacitor C1, the negative end of the capacitor E5, and the positive electrode of the diode D2 are connected and then grounded.

3. The non-isolated EC motor control circuit according to claim 1, characterized in that: The MCU main control circuit includes a chip IC1, wherein terminal 6 of the IC1 is connected to a DC15V terminal and one end of a capacitor C5, respectively; terminal 6 of the IC1 is connected to one end of a capacitor C6, one end of a capacitor C7, and a VDD5 terminal, respectively; and the other end of the capacitor C5 is connected to the other end of the capacitor C6 and the other end of the capacitor C7, respectively, and then grounded; Terminal 6 of the IC1 is connected to one end of a resistor R6 and one end of a capacitor C8 respectively. The other end of the capacitor C8 is grounded. The other end of the resistor R6 is connected to the chip U4 of the IPM power control circuit.

4. The non-isolated EC motor control circuit according to claim 1, characterized in that: The IPM power control circuit includes a chip U3, wherein the 26th terminal and the 1st terminal to the 7th terminal of the chip U3 are all connected to 310V, the 21st terminal to the 24th terminal of the chip U3 are all connected to the interface L2 and one end of the capacitor C10, the other end of the capacitor C10 is connected to the 9th terminal of the chip U3, the 11th terminal of the chip U3 is respectively connected to the 13th terminal of the chip U3, one end of the capacitor C9, the ground terminal, one end of the capacitor C11 and one end of the capacitor C12, and the 12th terminal of the chip U3 is respectively connected to the voltage 12V and the other end of the capacitor C9. The other end of the capacitor C11 is respectively connected to one end of the resistor R10 and terminal 14 of the chip U3, the other end of the capacitor C12 is respectively connected to one end of the resistor R9 and terminal 15 of the chip U3, terminal 17 of the chip U3 is connected to one end of the resistor R8, the other end of the resistor R8 is respectively connected to one end of the capacitor C13 and terminal 15 of the chip U1, the other end of the capacitor C13 is respectively connected to terminal 16 of the chip U3 and then grounded, terminal 18 of the chip U3 is connected to terminal 19 of the chip U3 and then connected to the COM terminal.

5. The non-isolated EC motor control circuit according to claim 4, characterized in that: The IPM power control circuit includes a chip U4, wherein terminal 26 and terminals 1 to 7 of the chip U4 are all connected to 310V, terminals 21 to 24 of the chip U4 are all connected to interface L1 and one end of capacitor C15, the other end of the capacitor C15 is connected to terminal 9 of the chip U4, terminal 11 of the chip U4 is respectively connected to terminal 13 of the chip U4, one end of capacitor C14, ground, one end of capacitor C16 and one end of capacitor C17, terminal 12 of the chip U4 is respectively connected to voltage 12V and the other end of capacitor C14, the other end of capacitor C16 is respectively connected to One end of the resistor R11 is connected to terminal 14 of the chip U4, the other end of the capacitor C17 is respectively connected to one end of the resistor R12 and terminal 15 of the chip U4, terminal 17 of the chip U4 is connected to one end of the resistor R13, the other end of the resistor R13 is respectively connected to one end of the capacitor C18 and terminal 12 of the chip U1, the other end of the capacitor C18 is respectively connected to terminal 16 of the chip U4 and then grounded, terminal 18 of the chip U4 is connected to terminal 19 of the chip U4 and then connected to the COM terminal, the other end of the resistor RS2, the other end of the resistor RS1 and the other end of the resistor R6; The other end of the resistor R11 is connected to the IPM drive signal inverting circuit, and the other end of the resistor R12 is also connected to the IPM drive signal inverting circuit.

6. The non-isolated EC motor control circuit according to claim 5, characterized in that: The IPM drive signal reverse circuit includes a transistor Q1, wherein terminal 1 of the transistor Q1 is connected to one end of the resistor R16 and the positive electrode of the voltage stabilizing diode ZD3, respectively, and the negative electrode of the voltage stabilizing diode ZD3 is connected to terminal 2 of the chip IC1. Terminal 2 of the transistor Q1 is connected to one end of the resistor R17 and the other end of the resistor R11 respectively, and the other end of the resistor R17 is connected to the VDD5 terminal; Terminal 3 of the transistor Q1 is connected to the other end of the resistor R16 and then grounded.

7. The non-isolated EC motor control circuit according to claim 6, characterized in that: The IPM drive signal reverse circuit includes a transistor Q2, wherein terminal 1 of the transistor Q2 is connected to one end of the resistor R15 and the positive electrode of the voltage stabilizing diode ZD2, respectively, and the negative electrode of the voltage stabilizing diode ZD2 is connected to terminal 3 of the chip IC1. Terminal 2 of the transistor Q2 is connected to one end of the resistor R14 and the other end of the resistor R12, respectively. The other end of the resistor R15 is connected to the VDD5 terminal. Terminal 3 of the transistor Q2 is connected to the other end of the resistor R15 and then grounded.

8. The non-isolated EC motor control circuit according to claim 1, characterized in that: The AC input rectifier circuit outputs a 310V voltage to power the bus voltage detection circuit and the IPM power control circuit.

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