Vehicle inverter controller

Abstract

The utility model provides a vehicle-mounted inverter controller, including a power supply voltage stabilization circuit, a BOOST boost circuit, a DC-DC boost circuit, an inverter circuit, a signal detection circuit and a control circuit. The input end of the BOOST boost circuit is connected to the vehicle-mounted 12V output or the vehicle-mounted solar panel output, and the DC power is boosted to output 30VDC. The DC-DC boost circuit converts 30VDC from DC low voltage to DC high voltage. The inverter circuit outputs 220V industrial frequency AC power through DC-AC conversion. The signal detection circuit is connected to the BOOST boost circuit, the DC-DC boost circuit, and the inverter circuit, and detects the input and output current and the load power through a mutual inductor, and sends them to the control circuit. The control circuit controls the switching elements of the BOOST boost circuit, the DC-DC boost circuit, and the inverter circuit through PWM to achieve stable voltage conversion and output. The vehicle-mounted inverter controller of the utility model adopts a high-frequency transformer for voltage conversion, which is small in size, high in conversion efficiency, and stable in operation.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile electronics, in particular to a vehicle-mounted inverter controller. Background Art

[0002] A car inverter is a device that converts the direct current (DC) of a car battery into alternating current (AC). Traditional car inverters are usually used for devices powered by car batteries, such as laptops, mobile phone chargers, portable electronic devices, etc. With the development of the automotive industry, automakers are increasingly focusing on providing vehicles with more electronic functions, such as entertainment systems, navigation systems, safety functions, etc. These functions require AC rather than DC. At the same time, with the rapid development of new energy vehicle technologies such as electric vehicles (EVs) and plug-in hybrid electric vehicles (PHEVs), there is an increasing demand for car inverters. These vehicles use batteries to store energy, and the direct current (DC) of the energy storage battery is converted into alternating current (AC) through the car inverter to drive the motor and achieve efficient operation of the vehicle. Power output and energy recovery are achieved through efficient DC-AC conversion and motor control.

[0003] The on-board inverter involves power electronic conversion technology to achieve DC-AC conversion. Due to the conduction loss of electronic components and the hysteresis loss of magnetic components, there will be energy loss in the power conversion process, resulting in low efficiency. With the development of automotive electronics and power electronics technology, on-board inverters are designed towards high efficiency, lightness and lower cost. In particular, with the application of fast semiconductor technology, on-board inverters are smaller and lighter, but with higher power density, meeting the requirements of automakers for space, weight and energy conversion efficiency. Utility Model Content

[0004] The utility model aims to provide a vehicle-mounted inverter controller with simple circuit structure, high reliability and wide versatility.

[0005] According to the first aspect of the purpose of the utility model, a vehicle-mounted inverter controller is provided, comprising a power supply voltage stabilization circuit, a BOOST boost circuit, a DC-DC boost circuit, an inverter circuit, a signal detection circuit and a control circuit;

[0006] The input end of the BOOST boost circuit is connected to the vehicle-mounted 12V DC output port or the vehicle-mounted solar panel DC output port, and is used to receive a DC power input and boost the output to 30VDC. The output end of the BOOST boost circuit is connected to the power supply voltage stabilization circuit.

[0007] The DC-DC boost circuit is connected to the BOOST boost circuit and is used to convert the input 30VDC from a DC low voltage to a DC high voltage;

[0008] The inverter circuit is connected to the output of the DC-DC boost circuit and is used to perform DC-AC conversion and output 220V industrial frequency AC power for use by the load;

[0009] The signal detection circuit is connected to the BOOST boost circuit, the DC-DC boost circuit, and the inverter circuit, detects input and output currents and load power through a mutual inductor, and sends the results to the control circuit;

[0010] The control circuit is connected to the BOOST boost circuit, the DC-DC boost circuit, and the inverter circuit, and is used to control the switching elements in the BOOST boost circuit, the DC-DC boost circuit, and the inverter circuit through a PWM pulse width modulation control signal to achieve stable voltage conversion and output.

[0011] As an optional solution, the control circuit uses the JieFa 7811 series embedded single-chip processor to form the main chip minimum working system, which is used to control the operation of the BOOST boost circuit, DC-DC boost circuit, inverter circuit, and signal detection circuit.

[0012] As an optional solution, the power supply voltage stabilizing circuit includes a 78M15 voltage stabilizing chip U1 and a 78M05 voltage stabilizing chip U2, the input end IN of the 78M15 voltage stabilizing chip U1 is connected to the output end of the BOOST boost circuit, and the input end IN of the 78M05 voltage stabilizing chip U2 is connected to the output end of the 78M15 voltage stabilizing chip U1.

[0013] As an optional solution, the BOOST boost circuit receives a DC voltage input from a vehicle-mounted 12V DC output port or a vehicle-mounted solar panel DC output port, connects to an inductor and two NMOS tubes after filtering, and connects to a complementary push-pull circuit to drive the NMOS tube to work through a PWM pulse width modulation signal PWM3 output by the control circuit, and the inductor output is connected to a diode rectifier to output 30VDC.

[0014] As an optional solution, the output voltage 30VDC of the BOOST voltage-boosting circuit is connected to the AD port of the control circuit after being divided by resistors and filtered by capacitors.

[0015] As an optional solution, the DC-DC boost circuit is connected to the BOOST boost circuit, the input voltage is 30VDC, and a high-frequency AC voltage is output through 4 switch tubes. The high-frequency AC voltage is input into the primary coil of the high-frequency transformer T1, and the secondary coil of T1 outputs 220V high-frequency AC power through the resonant inductor and capacitor, and then the 220V high-frequency AC power is rectified into a DC high-voltage output through a rectifier circuit composed of 4 rectifier diodes, thereby realizing the process of converting DC low voltage to DC high voltage;

[0016] The four switch tubes are configured to be controlled by the PWM pulse width modulation signal PWM2 output by the control circuit to control the switch tube driving chips U7 and U8, which respectively drive the conduction switching of the four switch tubes.

[0017] As an optional solution, the inverter circuit includes a high-speed switching circuit composed of four IGBT switching tubes, which adjusts the output AC power through fast switching; the high-speed switching circuit controls the IGBT driving chips U4 and U5 respectively through the PWM pulse width modulation control signals PWM0 and PWM1 output by the control circuit through a timer, drives the IGBT, and generates a 220V industrial frequency AC output through a resonant inductor and capacitor.

[0018] Combined with the vehicle-mounted inverter controller design of the above implementation scheme, compared with other existing inverters, the design of the utility model has significant advantages in that the transformer used in the vehicle-mounted inverter controller of the utility model is a high-frequency transformer with small size, high conversion efficiency, stable operation, and convenient user use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are not intended to be drawn to scale. In the accompanying drawings, each identical or approximately identical component shown in each figure may be represented by the same reference numeral. For clarity, not every component is labeled in each figure. Now, embodiments of various aspects of the utility model will be described by way of example and with reference to the accompanying drawings.

[0020] Figure 1 It is a logic schematic diagram of a vehicle-mounted inverter controller according to an embodiment of the utility model.

[0021] Figure 2 It is a schematic diagram of a power supply voltage stabilizing circuit of a vehicle-mounted inverter controller according to an embodiment of the utility model.

[0022] Figure 3a It is a schematic diagram of a BOOST boost circuit of a vehicle-mounted inverter controller according to an embodiment of the utility model.

[0023] Figure 3b It is a schematic diagram of a control signal circuit of a BOOST boost circuit of a vehicle-mounted inverter controller according to an embodiment of the utility model.

[0024] Figure 4 It is a schematic diagram of a DC-DC boost circuit of a vehicle-mounted inverter controller according to an embodiment of the utility model.

[0025] Figure 5 It is a schematic diagram of an inverter circuit of a vehicle-mounted inverter controller according to an embodiment of the utility model.

[0026] Figure 6It is a schematic diagram of a signal detection circuit of a vehicle inverter controller according to an embodiment of the utility model. DETAILED DESCRIPTION

[0027] In order to better understand the technical content of the present invention, specific embodiments are described below in conjunction with the accompanying drawings.

[0028] Various aspects of the utility model are described in the present disclosure with reference to the accompanying drawings, in which many illustrative embodiments are shown. The embodiments of the present disclosure are not necessarily intended to include all aspects of the utility model. It should be understood that the various concepts and embodiments introduced above, as well as those described in more detail below, can be implemented in any of many ways, because the concepts and embodiments disclosed by the utility model are not limited to any implementation. In addition, some aspects disclosed by the utility model can be used alone, or in any appropriate combination with other aspects disclosed by the utility model.

[0029] Combination Figure 1-Figure 6 The vehicle-mounted inverter controller of the illustrated embodiment includes a power supply voltage stabilization circuit, a BOOST boost circuit, a DC-DC boost circuit, an inverter circuit, a signal detection circuit and a control circuit, aiming to realize voltage conversion and output of vehicle-mounted low-voltage DC input to 220V high-voltage AC.

[0030] Combination Figure 1 , 2 As shown in , 3a, and 3b, the input end of the BOOST boost circuit is connected to the vehicle-mounted 12V DC output port or the vehicle-mounted solar panel DC output port, which is used to receive DC power input and boost the output to 30VDC, and the output end of the BOOST boost circuit is connected to the power supply voltage stabilization circuit.

[0031] The DC-DC boost circuit is connected to the BOOST boost circuit and is used to convert the input 30VDC from a DC low voltage to a DC high voltage.

[0032] The inverter circuit is connected to the output of the DC-DC boost circuit for performing DC-AC conversion and outputting 220V industrial frequency AC power for use by the load.

[0033] The signal detection circuit is connected with the BOOST boost circuit, the DC-DC boost circuit and the inverter circuit, detects the input and output current and the load power through the mutual inductor, and sends them to the control circuit.

[0034] The control circuit is connected with the BOOST boost circuit, the DC-DC boost circuit and the inverter circuit, and is used to control the switch elements in the BOOST boost circuit, the DC-DC boost circuit and the inverter circuit through a PWM pulse width modulation control signal to achieve stable voltage conversion and output.

[0035] As an optional method, the control circuit is used as the main control circuit, and the Jiefa 7811 series embedded single-chip processor is used to form the minimum working system of the main chip. Taking AC7811 as an example, LQFP80 package, 32-bit ARM CPU architecture, automotive-grade chip, combined with Figure 1 As shown, it is used to control the operation of the BOOST boost circuit, the DC-DC boost circuit, the inverter circuit, and the signal detection circuit through a PWM control signal.

[0036] As an alternative, combine Figure 2 As shown, the power supply voltage stabilization circuit includes 78M15 voltage stabilization chip U1 and 78M05 voltage stabilization chip U2, capacitors C1, C2, C3, C4, C5, and C6. Figure 2 , 3a 3b, the input terminal IN of the 78M15 voltage regulator chip U1 is connected to the output terminal of the BOOST boost circuit, and the input terminal IN of the 78M05 voltage regulator chip U2 is connected to the output terminal of the 78M15 voltage regulator chip U1.

[0037] As an alternative, Figure 3a As shown in FIG. 1 , the BOOST boost circuit receives a DC voltage input from the vehicle-mounted 12V DC output port (P2 in the figure) or the vehicle-mounted solar panel DC output port (P3 in the figure), connects the inductor and two NMOS tubes (Q5, Q6) after filtering, and connects the complementary push-pull circuit to drive the NMOS tube to work through the PWM pulse width modulation signal PWM3 output by the control circuit (as shown in FIG. Figure 3b As shown), the inductor output is connected to a diode rectifier output 30VDC.

[0038] Among them, Figure 3a The output voltage 30VDC of the BOOST boost circuit is connected to the AD port of the control circuit after resistor voltage division and capacitor filtering.

[0039] As an example, the NMOS tubes Q5 and Q6 are selected as CRTT067N10N respectively.

[0040] As an alternative, Figure 4 As shown, the DC-DC boost circuit is connected to the BOOST boost circuit, the input voltage is 30VDC, and the high-frequency AC voltage is output through 4 switch tubes (Q7, Q8, Q10, Q11). The high-frequency AC voltage is input into the primary coil of the high-frequency transformer T1, and the secondary coil of T1 outputs 220V high-frequency AC power through the resonant inductor and capacitor, and then the 220V high-frequency AC power is rectified into a DC high voltage output through a rectifier circuit composed of 4 rectifier diodes, realizing the process of converting DC low voltage to DC high voltage.

[0041] The four switch tubes are configured to be controlled by the PWM pulse width modulation signal PWM2 output by the control circuit to control the switch tube driving chips U6 and U7, which respectively drive the conduction switching of the four switch tubes.

[0042] Among them, the switch tube driver chips U7 and U8 respectively use: IR2113SPBF.

[0043] The selected types of the four switch tubes Q7, Q8, Q10 and Q11 are CRTT067N10N.

[0044] As an alternative, combine Figure 5 As shown, the inverter circuit includes a high-speed switching circuit composed of four IGBT switch tubes (Q1, Q2, Q3, Q4), which adjusts the output AC power by fast switching; the high-speed switching circuit controls the IGBT driver chips U4 and U5 respectively through the PWM pulse width modulation control signals PWM0 and PWM1 output by the control circuit through the timer, drives the IGBT, and generates 220V industrial frequency AC output through the resonant inductor and capacitor.

[0045] As an example, IGBT driver chips U4 and U5 are respectively NSi6602A-DSWR. The four IGBT switch tubes (Q1, Q2, Q3, Q4) are YGP20N65T2.

[0046] Combination Figure 6 As shown, the signal detection circuit detects the input and output current through the mutual inductor, detects the load power, and adjusts the switch circuit in time. The detection current flows through the mutual inductor T2, and the induced voltage is generated on the secondary side of T2. After being rectified by the diode D13, it is input to the operational amplifier, and the operational amplifier is proportionally adjusted and input to the control circuit. The output current determines the output power. When the load exceeds the maximum output power of the device, the current increases, and the current detection circuit detects that the threshold value is exceeded, and the inverter output is turned off to protect the device; the input current detection is also used to protect the device. If the current is too large, the BOOST circuit and the DCDC boost circuit are turned off in time. The operational amplifier uses AD8607ARZ.

[0047] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. A person with ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the claims.

Claims

1. A vehicle-mounted inverter controller, characterized in that: Including power supply voltage stabilization circuit, BOOST boost circuit, DC-DC boost circuit, inverter circuit, signal detection circuit and control circuit; The input end of the BOOST boost circuit is connected to the vehicle-mounted 12V DC output port or the vehicle-mounted solar panel DC output port, and is used to receive a DC power input and boost the output to 30VDC. The output end of the BOOST boost circuit is connected to the power supply voltage stabilization circuit. The DC-DC boost circuit is connected to the BOOST boost circuit and is used to convert the input 30VDC from a DC low voltage to a DC high voltage; The inverter circuit is connected to the output of the DC-DC boost circuit and is used to perform DC-AC conversion and output 220V industrial frequency AC power for use by the load; The signal detection circuit is connected to the BOOST boost circuit, the DC-DC boost circuit, and the inverter circuit, detects input and output currents and load power through a mutual inductor, and sends the results to the control circuit; The control circuit is connected to the BOOST boost circuit, the DC-DC boost circuit, and the inverter circuit, and is used to control the switching elements in the BOOST boost circuit, the DC-DC boost circuit, and the inverter circuit through a PWM pulse width modulation control signal to achieve stable voltage conversion and output.

2. The vehicle-mounted inverter controller according to claim 1, characterized in that: The control circuit uses the Jiefa 7811 series embedded single-chip processor to form the minimum working system of the main chip, which is used to control the operation of the BOOST boost circuit, DC-DC boost circuit, inverter circuit, and signal detection circuit.

3. The vehicle-mounted inverter controller according to claim 1, characterized in that: The power supply voltage stabilizing circuit includes a 78M15 voltage stabilizing chip U1 and a 78M05 voltage stabilizing chip U2. The input terminal IN of the 78M15 voltage stabilizing chip U1 is connected to the output terminal of the BOOST boost circuit, and the input terminal IN of the 78M05 voltage stabilizing chip U2 is connected to the output terminal of the 78M15 voltage stabilizing chip U1.

4. The vehicle-mounted inverter controller according to claim 1, characterized in that: The BOOST boost circuit receives a DC voltage input from a vehicle-mounted 12V DC output port or a vehicle-mounted solar panel DC output port, connects to an inductor and two NMOS tubes after filtering, connects to a complementary push-pull circuit through a PWM pulse width modulation signal PWM3 output by the control circuit to drive the NMOS tube to work, and the inductor output is connected to a diode rectifier to output 30VDC.

5. The vehicle-mounted inverter controller according to claim 4, characterized in that: The output voltage 30VDC of the BOOST boost circuit is connected to the AD port of the control circuit after resistor voltage division and capacitor filtering.

6. The vehicle-mounted inverter controller according to claim 1, characterized in that: The DC-DC boost circuit is connected to the BOOST boost circuit, the input voltage is 30VDC, and the high-frequency AC voltage is output through 4 switch tubes. The high-frequency AC voltage is input into the primary coil of the high-frequency transformer T1, and the secondary coil of T1 outputs 220V high-frequency AC through the resonant inductor and capacitor. Then, the 220V high-frequency AC is rectified into a DC high-voltage output through a rectifier circuit composed of 4 rectifier diodes, realizing the process of converting DC low voltage to DC high voltage. The four switch tubes are configured to be controlled by the PWM pulse width modulation signal PWM2 output by the control circuit to control the switch tube driving chips U6 and U7, which respectively drive the conduction switching of the four switch tubes.

7. The vehicle-mounted inverter controller according to claim 6, characterized in that: The switch tube driving chips U6 and U7 respectively adopt: IR2113SPBF.

8. The vehicle-mounted inverter controller according to claim 1, characterized in that: The inverter circuit includes a high-speed switching circuit composed of four IGBT switching tubes, which adjusts the output AC power by fast switching; the high-speed switching circuit controls the IGBT driving chips U4 and U5 respectively by the PWM pulse width modulation control signals PWM0 and PWM1 output by the control circuit through the timer, drives the IGBT, and generates 220V industrial frequency AC output through the resonant inductor and capacitor.

9. The vehicle-mounted inverter controller according to claim 8, characterized in that: The IGBT driver chips U4 and U5 respectively adopt: NSi6602A-DSWR.

Images