Power tube driving circuit and optical storage inverter

Abstract

The utility model belongs to the field of optical storage inverter driving, and particularly provides a power tube driving circuit and an optical storage inverter, the power tube driving circuit comprises a signal receiving module, an amplification module, an isolation module and an output module, the signal receiving module, the amplification module, the isolation module and the output module are electrically connected in sequence; the signal receiving module is suitable for receiving a high-level signal, and then the high-level signal sequentially passes through the amplification module and the isolation module to control the output module to output positive voltage; the signal receiving module is also suitable for receiving a low-level signal, and then the low-level signal sequentially passes through the amplification module and the isolation module and then controls the output module to output negative voltage. By arranging the isolation module, the control signal output by the DSP controller is isolated from the power tube, so that the anti-interference capability of the power tube driving circuit is improved. And meanwhile, the output module can output positive voltage and negative voltage to control the on-off of the power tube, so that the reliability of the on-off of the power tube is improved.

Description

Technical Field

[0001] The utility model relates to the field of photovoltaic storage inverter driving, in particular to a power tube driving circuit and a photovoltaic storage inverter. Background Art

[0002] The most important components in the inverter circuit and inverter are power tubes. The conversion from DC to AC is achieved by controlling the on and off of the power tubes. However, the power tube switch signal generated by the DSP controller is often not enough to drive the power tube on and off. Therefore, a drive circuit is required between the switch signal generated by the DSP controller and the power tube to achieve power amplification to achieve sufficient power, thereby driving the power tube in the inverter circuit or inverter.

[0003] The power tube driving circuit in the related art has the following problems: the control circuit and the power circuit are not isolated, which makes the circuit susceptible to interference during operation; the transformer is used as an isolation device, which increases the occupied volume and the applicable power level is small; the output voltage in the circuit starts from zero, no negative pressure is generated, and the power tube shutdown effect is poor.

[0004] The above problems need to be solved urgently. Utility Model Content

[0005] The utility model aims to provide a power tube driving circuit and a photovoltaic storage inverter.

[0006] In order to solve the above technical problems, the utility model provides a power tube driving circuit, comprising:

[0007] Signal receiving module, amplification module, isolation module and output module

[0008] The signal receiving module, the amplifying module, the isolating module and the output module are electrically connected in sequence;

[0009] The signal receiving module is suitable for receiving a high-level signal, and then controls the output module to output a positive voltage after passing through the amplification module and the isolation module in sequence;

[0010] The signal receiving module is also suitable for receiving a low-level signal, and then controlling the output module to output a negative voltage after passing through the amplification module and the isolation module in sequence.

[0011] Furthermore, the signal receiving module includes: a PWM signal receiving end and an RC filtering unit;

[0012] The PWM signal receiving end is electrically connected to the RC filter unit, and is electrically connected to the amplifying module after being filtered by the RC filter unit.

[0013] Furthermore, the RC filter unit includes: a resistor R1 and a capacitor C6;

[0014] The PWM signal receiving end is connected in series with the resistor R1 and then electrically connected to the amplification module;

[0015] One end of the capacitor C6 is connected between the resistor R1 and the amplifying module, and the other end is grounded GND.

[0016] Furthermore, the amplification module includes:

[0017] Transistor Q1, resistor R2, resistor R3, capacitor C1, capacitor C2 and capacitor C3;

[0018] After the capacitors C1, C2 and C3 are connected in parallel, one end is grounded to GND and the other end is connected to a high voltage;

[0019] The collector of the transistor Q1 is connected high;

[0020] The emitter of the transistor Q1 is connected to the ground GND after passing through the resistor R2 and the resistor R3 in sequence;

[0021] The base of the transistor Q1 is electrically connected to the signal receiving module;

[0022] The primary side of the isolation module is electrically connected between the emitter of the transistor Q1 and the resistor R2 .

[0023] Furthermore, pins 1 and 3 of the primary side of the isolation module are electrically connected to two ends of the resistor R2 respectively;

[0024] Pin 2 in the primary side of the isolation module is grounded GND;

[0025] The secondary side of the isolation module is electrically connected to the output module.

[0026] Furthermore, the output module includes: a DC power supply, a voltage stabilizing diode ZD1 and a resistor R4;

[0027] Pins 4 and 6 of the secondary side of the isolation module are connected in parallel to the two ends of the DC power supply;

[0028] Pin 5 of the secondary side of the isolation module is electrically connected to the output terminal PWM_H;

[0029] The voltage stabilizing diode ZD1 and the resistor R4 are connected in series and then in parallel at two ends of the DC power supply.

[0030] Furthermore, the output module further includes: capacitor C4, capacitor C7, capacitor C5 and capacitor C8;

[0031] The capacitor C4 and the capacitor C7 are connected in series and then connected in parallel at both ends of the DC power supply;

[0032] The capacitor C5 and the capacitor C8 are connected in series and then in parallel at both ends of the DC power supply.

[0033] Furthermore, the output module also includes an output terminal PWM_L;

[0034] The output terminal PWM_L is sequentially led out from between the capacitor C4 and the capacitor C7 , between the capacitor C5 and the capacitor C8 , and between the voltage stabilizing diode ZD1 and the resistor R4 .

[0035] The utility model also provides a photovoltaic storage inverter, comprising:

[0036] An inverter circuit, a DSP controller and N power tube drive circuits as described above;

[0037] The DSP controller is electrically connected to each of the power tube driving circuits;

[0038] The power tube driving circuit is electrically connected to the corresponding power tube in the inverter circuit.

[0039] Furthermore, the DSP controller is suitable for sending a high-level signal or a low-level signal to the corresponding signal receiving module of the power tube driving circuit, thereby controlling the on and off of the corresponding power tube through the output module.

[0040] The beneficial effect of the utility model is that the utility model provides a power tube driving circuit and a photovoltaic storage inverter, wherein the power tube driving circuit includes: a signal receiving module, an amplifying module, an isolation module and an output module. The signal receiving module, the amplifying module, the isolation module and the output module are electrically connected in sequence; the signal receiving module is suitable for receiving a high-level signal, and then controls the output module to output a positive voltage after passing through the amplifying module and the isolation module in sequence; the signal receiving module is also suitable for receiving a low-level signal, and then controls the output module to output a negative voltage after passing through the amplifying module and the isolation module in sequence. By setting the isolation module, the control signal output by the DSP controller is isolated from the power tube, thereby improving the anti-interference ability of the power tube driving circuit. At the same time, the output module can output positive voltage and negative voltage to control the on and off of the power tube, thereby improving the reliability of the on and off of the power tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0042] Figure 1 It is a circuit diagram of the connection between the power tube driving circuit and the power tube provided by the embodiment of the utility model.

[0043] Figure 2 It is a packaging diagram of the isolation module provided by the embodiment of the utility model.

[0044] Figure 3 This is a control principle diagram of the photovoltaic storage inverter provided in the embodiment of the utility model. DETAILED DESCRIPTION

[0045] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0046] For example, see Figure 1-Figure 3 This embodiment provides a power tube driving circuit, including: a signal receiving module, an amplifying module, an isolation module and an output module. The signal receiving module, the amplifying module, the isolation module and the output module are electrically connected in sequence; the signal receiving module is suitable for receiving a high-level signal, and then controls the output module to output a positive voltage after passing through the amplifying module and the isolation module in sequence; the signal receiving module is also suitable for receiving a low-level signal, and then controls the output module to output a negative voltage after passing through the amplifying module and the isolation module in sequence. By setting up the isolation module, the control signal output by the DSP controller is isolated from the power tube, thereby improving the anti-interference ability of the power tube driving circuit. At the same time, the output module can output positive and negative voltages to control the on and off of the power tube, thereby improving the on and off reliability of the power tube.

[0047] In this embodiment, the signal receiving module includes: a PWM signal receiving end and an RC filter unit; the PWM signal receiving end is electrically connected to the RC filter unit, and is electrically connected to the amplification module after being filtered by the RC filter unit. The control signal received by the PWM signal receiving end is filtered by the RC filter unit.

[0048] The RC filter unit includes: a resistor R1 and a capacitor C6; the PWM signal receiving end is connected in series with the resistor R1 and then electrically connected to the amplification module; one end of the capacitor C6 is connected between the resistor R1 and the amplification module, and the other end is grounded GND.

[0049] In this embodiment, the amplification module includes: transistor Q1, resistor R2, resistor R3, capacitor C1, capacitor C2 and capacitor C3; after the capacitor C1, capacitor C2 and capacitor C3 are connected in parallel, one end is grounded GND and the other end is connected to high; the collector of the transistor Q1 is connected to high; the emitter of the transistor Q1 is connected to ground GND after passing through resistor R2 and resistor R3 in turn; the base of the transistor Q1 is electrically connected to the signal receiving module; the primary side of the isolation module is electrically connected between the emitter of the transistor Q1 and the resistor R2. Among them, the capacitor C1, capacitor C2 and capacitor C3 are connected in parallel to play a filtering role, making the DC power supply more stable. Resistors R2 and R3 are current limiting resistors, thereby limiting the current passing through the primary side of the isolation module.

[0050] In this embodiment, the isolation module is an optocoupler isolator U1, model F0D8342, and pins 1 and 3 in the primary side of the isolation module are electrically connected to the two ends of the resistor R2 respectively; pin 2 in the primary side of the isolation module is grounded GND; and the secondary side of the isolation module is electrically connected to the output module.

[0051] In this embodiment, the output module includes: a DC power supply, a voltage stabilizing diode ZD1 and a resistor R4; pins 4 and 6 of the secondary side of the isolation module are connected in parallel at both ends of the DC power supply; pin 5 of the secondary side of the isolation module is electrically connected to the output terminal PWM_H; the voltage stabilizing diode ZD1 and the resistor R4 are connected in series and then connected in parallel at both ends of the DC power supply. The output terminal PWM_H is electrically connected to the gate of the power tube.

[0052] The output module further includes: capacitor C4, capacitor C7, capacitor C5 and capacitor C8; the capacitor C4 and capacitor C7 are connected in series and then connected in parallel at both ends of the DC power supply; the capacitor C5 and capacitor C8 are connected in series and then connected in parallel at both ends of the DC power supply. The function of the capacitors C4 and C7 is mainly to stabilize the output voltage. The capacitors C5 and C8 are mainly to filter out high-frequency signals in the voltage.

[0053] In this embodiment, the output module further includes an output terminal PWM_L, which is sequentially led from between the capacitor C4 and the capacitor C7, between the capacitor C5 and the capacitor C8, and between the voltage stabilizing diode ZD1 and the resistor R4. The output terminal PWM_L is electrically connected to the drain of the power tube.

[0054] When the DC power supply VC1 is +23V, when the upper tube of the secondary side of the optocoupler, that is, pins 5 and 6, are turned on, the output pin PWM_H=VC1, and the voltage between the output pins PWM_H and PWM_L is the voltage between the voltage regulator tube ZD1; when the lower tube of the secondary side of the optocoupler, that is, pins 4 and 5, are turned on, the output pin PWM_H=GND1, and the voltage between the output pins PWM_H and PWM_L is the voltage between the resistor R4.

[0055] This embodiment also provides a photovoltaic storage inverter, including: an inverter circuit, a DSP controller and N power tube driving circuits as described above; the DSP controller is electrically connected to each of the power tube driving circuits; the power tube driving circuit is electrically connected to the corresponding power tube in the inverter circuit.

[0056] Wherein, N is greater than or equal to 2.

[0057] In this embodiment, the DSP controller is suitable for sending a high level signal or a low level signal to the corresponding signal receiving module of the power tube driving circuit, so as to control the on and off of the corresponding power tube through the output module.

[0058] In summary, the utility model provides a power tube drive circuit and a photovoltaic storage inverter, wherein the power tube drive circuit includes: a signal receiving module, an amplifying module, an isolation module and an output module. The signal receiving module, the amplifying module, the isolation module and the output module are electrically connected in sequence; the signal receiving module is suitable for receiving a high-level signal, and then controls the output module to output a positive voltage after passing through the amplifying module and the isolation module in sequence; the signal receiving module is also suitable for receiving a low-level signal, and then controls the output module to output a negative voltage after passing through the amplifying module and the isolation module in sequence. By setting up an isolation module, the control signal output by the DSP controller is isolated from the power tube, thereby improving the anti-interference ability of the power tube drive circuit. At the same time, the output module can output positive and negative voltages to control the on and off of the power tube, thereby improving the reliability of the on and off of the power tube.

[0059] All devices (parts without specific structure) selected in this application are universal standard parts or parts known to those skilled in the art, and their structures and principles can be known by those skilled in the art through technical manuals or conventional experimental methods. In addition, the software programs involved in this application are all prior art, and this application does not involve any improvement to the software programs.

[0060] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0062] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0063] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0064] In addition, each functional unit in each embodiment of the present utility model may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0065] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A power tube driving circuit, characterized in that: include: Signal receiving module, amplification module, isolation module and output module The signal receiving module, the amplifying module, the isolating module and the output module are electrically connected in sequence; The signal receiving module is suitable for receiving a high-level signal, and then controls the output module to output a positive voltage after passing through the amplification module and the isolation module in sequence; The signal receiving module is also suitable for receiving a low-level signal, and then controlling the output module to output a negative voltage after passing through the amplification module and the isolation module in sequence.

2. The power tube driving circuit according to claim 1, characterized in that: The signal receiving module includes: a PWM signal receiving end and an RC filtering unit; The PWM signal receiving end is electrically connected to the RC filter unit, and is electrically connected to the amplifying module after being filtered by the RC filter unit.

3. The power tube driving circuit according to claim 2, characterized in that: The RC filter unit includes: a resistor R1 and a capacitor C6; The PWM signal receiving end is connected in series with the resistor R1 and then electrically connected to the amplification module; One end of the capacitor C6 is connected between the resistor R1 and the amplifying module, and the other end is grounded GND.

4. The power tube driving circuit according to claim 1, characterized in that: The amplification module comprises: Transistor Q1, resistor R2, resistor R3, capacitor C1, capacitor C2 and capacitor C3; After the capacitors C1, C2 and C3 are connected in parallel, one end is grounded to GND and the other end is connected to a high voltage; The collector of the transistor Q1 is connected high; The emitter of the transistor Q1 is connected to the ground GND after passing through the resistor R2 and the resistor R3 in sequence; The base of the transistor Q1 is electrically connected to the signal receiving module; The primary side of the isolation module is electrically connected between the emitter of the transistor Q1 and the resistor R2 .

5. The power tube driving circuit according to claim 4, characterized in that: Pins 1 and 3 of the primary side of the isolation module are electrically connected to two ends of the resistor R2 respectively; Pin 2 in the primary side of the isolation module is grounded GND; The secondary side of the isolation module is electrically connected to the output module.

6. The power tube driving circuit according to claim 5, characterized in that: The output module includes: a DC power supply, a voltage stabilizing diode ZD1 and a resistor R4; Pins 4 and 6 of the secondary side of the isolation module are connected in parallel to the two ends of the DC power supply; Pin 5 of the secondary side of the isolation module is electrically connected to the output terminal PWM_H; The voltage stabilizing diode ZD1 and the resistor R4 are connected in series and then in parallel at two ends of the DC power supply.

7. The power tube driving circuit according to claim 6, characterized in that: The output module further includes: capacitor C4, capacitor C7, capacitor C5 and capacitor C8; The capacitor C4 and the capacitor C7 are connected in series and then connected in parallel at both ends of the DC power supply; The capacitor C5 and the capacitor C8 are connected in series and then in parallel at both ends of the DC power supply.

8. The power tube driving circuit according to claim 7, characterized in that: The output module also includes an output terminal PWM_L; The output terminal PWM_L is sequentially led out from between the capacitor C4 and the capacitor C7 , between the capacitor C5 and the capacitor C8 , and between the voltage stabilizing diode ZD1 and the resistor R4 .

9. A solar-storage inverter, characterized in that: include: An inverter circuit, a DSP controller, and N power tube drive circuits as described in any one of claims 1 to 8; The DSP controller is electrically connected to each of the power tube driving circuits; The power tube driving circuit is electrically connected to the corresponding power tube in the inverter circuit.

10. The photovoltaic energy storage inverter according to claim 9, characterized in that: The DSP controller is suitable for sending a high level signal or a low level signal to the corresponding signal receiving module of the power tube driving circuit, so as to control the on and off of the corresponding power tube through the output module.

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