Inverter compressor driver based on non-electrolysis scheme

Abstract

The utility model discloses an inverter compressor driver based on a non-electrolysis scheme, which is characterized by comprising a safety circuit, an anti-interference circuit, a rectifying circuit, a communication circuit, a voltage sampling circuit and a driving circuit, the safety circuit and the anti-interference circuit do not comprise harmonic inductors. The rectifying circuit comprises a one-way rectifier bridge DB1 and an equivalent thin-film capacitor, and the rectifying circuit outputs reference voltage; three voltage sampling circuits with the same structure are arranged, the first voltage sampling circuit is connected with a live wire of a power grid, the second voltage sampling circuit is connected with a zero line of the power grid, and the third voltage sampling circuit is connected with reference voltage. According to the utility model, circuit design is matched with software setting, a large electrolytic capacitor in a traditional scheme is replaced by a thin-film capacitor, and a harmonic reactor does not need to be accessed, so that the circuit complexity is reduced, the production cost is reduced, and the integration level and the production efficiency are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to variable frequency compressor technical field, concretely is a variable frequency compressor driver based on no electrolytic scheme. BACKGROUND

[0002] The variable frequency compressor driver is an important component in the variable frequency refrigerator. The traditional variable frequency compressor driver uses large electrolytic capacitor and harmonic reactance in the circuit, so that the volume and weight of the driver are large, and the production and assembly efficiency is low. CONTENT OF UTILITY MODEL

[0003] The utility model discloses a variable frequency compressor driver based on no electrolytic scheme, and solves the problem of the existing driver to overcome the deficiency of prior art.

[0004] The utility model discloses a variable frequency compressor driver based on no electrolytic scheme, and solves the problem of the existing driver to overcome the deficiency of prior art.

[0005] Further, the equivalent thin film capacitor is composed of the first thin film capacitor CF1 and the second thin film capacitor CF2 in parallel.

[0006] Further, the safety circuit includes the first resistor R7, the second capacitor CX2, the third capacitor CY1 and the fourth capacitor CY2, the first resistor R7 is connected with the live wire and the zero line respectively at both ends, the second capacitor CX2 is connected with the first resistor R7 in parallel, the third capacitor CY1 is connected with the zero line and the ground wire respectively at both ends, and the fourth capacitor CY2 is connected with the live wire and the ground wire respectively at both ends.

[0007] Further, the anti-interference circuit includes the fuse FS1, the first pressure sensitive resistor ZNR1, the second pressure sensitive resistor ZNR2, the first capacitor CX1, the discharge tube DSA1 and the common mode inductor FL1, the second pressure sensitive resistor ZNR2 and the discharge tube DSA1 are connected in series on the live wire, the common mode inductor FL1 includes four pins, the first pin of FL1 is connected with the discharge tube DSA1, the second pin is connected with the second pressure sensitive resistor ZNR2, the third and fourth pins are connected with the zero line, the first pressure sensitive resistor is connected with the live wire and the zero line respectively at both ends, the first capacitor CX1 is connected with the first pressure sensitive resistor ZNR1 in parallel, and the fuse FS1 is connected in series on the live wire.

[0008] Further, the first voltage sampling circuit comprises a second resistor RM22, a third resistor RM10, a fourth resistor RM24, a fifth resistor RM25 and a sixth resistor RM11 connected in series, the second resistor RM22 is connected to a live wire, one end of the sixth resistor RM11 is connected to ground, the other end of the sixth resistor RM11 is connected to the chip UM2, the sixth resistor RM11 has a fifth capacitor CM3 and a first transistor D10 connected in parallel across the sixth resistor RM11, and the first transistor D10 is connected to the second transistor D8.

[0009] The utility model has the advantages that: the utility model provides a variable frequency compressor driver based on electrolysis-free scheme, realizes that the big point solution capacitor in traditional scheme is replaced by the film capacitor through circuit design cooperation software setting, and does not need to access harmonic reactance, thereby reduce the circuit complexity, reduce production cost, improve the integration level and production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 The utility model discloses a variable frequency compressor driver based on electrolysis-free scheme's rectifier circuit principle diagram.

[0011] Figure 2 The utility model discloses a variable frequency compressor driver based on electrolysis-free scheme's rectifier circuit principle diagram.

[0012] Figure 3 The utility model discloses a variable frequency compressor driver based on electrolysis-free scheme's voltage sampling circuit principle diagram.

[0013] Figure 4 The utility model discloses a variable frequency compressor driver based on electrolysis-free scheme's communication circuit principle diagram.

[0014] Figure 5 The utility model discloses a variable frequency compressor driver based on electrolysis-free scheme's drive circuit principle diagram.

[0015] Figure 6 The utility model discloses a variable frequency compressor driver based on electrolysis-free scheme's control chip's pin structure schematic diagram. DETAILED DESCRIPTION

[0016] The technical solutions of the present application will be described below in conjunction with the drawings, obviously, the described embodiments are part of the embodiments of the present application, not all the embodiments.

[0017] The components of the embodiments of the present application generally described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application.

[0018] All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative labor fall within the scope of the present application.

[0019] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0020] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0021] The following refers to Figures 1-6 A variable frequency compressor driver based on a non-electrolytic solution is described according to some embodiments of the present application.

[0022] A variable frequency compressor driver based on a non-electrolytic solution includes a safety circuit, an anti-interference circuit, a rectifier circuit, a communication circuit, a voltage sampling circuit, a driving circuit, and a control chip.

[0023] Compared with the traditional circuit, the harmonic inductance is cancelled in the design of the safety regulation circuit and the anti-interference circuit. The safety regulation circuit comprises a first resistor R7, a second capacitor CX2, a third capacitor CY1 and a fourth capacitor CY2. The first resistor R7 is connected to the live wire and the neutral wire respectively. The second capacitor CX2 is connected to the first resistor R7 in parallel. The third capacitor CY1 is connected to the neutral wire and the ground wire respectively. The fourth capacitor CY2 is connected to the live wire and the ground wire respectively. The anti-interference circuit comprises a fuse FS1, a first voltage-dependent resistor ZNR1, a second voltage-dependent resistor ZNR2, a first capacitor CX1 and a discharge tube DSA1. The second voltage-dependent resistor ZNR2 and the discharge tube DSA1 are connected in series to the live wire. The common mode inductor FL1 comprises four pins. The first pin of the common mode inductor FL1 is connected to the discharge tube DSA1. The second pin of the common mode inductor FL1 is connected to the second voltage-dependent resistor ZNR2. The third and fourth pins of the common mode inductor FL1 are connected to the neutral wire. The first voltage-dependent resistor is connected to the live wire and the neutral wire respectively. The first capacitor CX1 is connected to the first voltage-dependent resistor ZNR1 in parallel. The fuse FS1 is connected to the live wire in series. Through the circuit design and the software control, the anti-electromagnetic interference function is realized.

[0024] Three groups of voltage sampling circuits with the same structure are provided, wherein the first voltage sampling circuit is connected to the live wire of the power grid, the second voltage sampling circuit is connected to the neutral wire of the power grid, and the third voltage sampling circuit is connected to a reference voltage. Taking the first voltage sampling circuit as an example, the first voltage sampling circuit comprises a second resistor RM22, a third resistor RM10, a fourth resistor RM24, a fifth resistor RM25 and a sixth resistor RM11 connected in series. The second resistor RM22 is connected to the live wire of the power grid. One end of the sixth resistor RM11 is connected to the ground, and the other end is connected to a chip UM2. The sixth resistor RM11 is connected to a fifth capacitor CM3 and a first transistor D10 in parallel at its two ends. The first transistor D10 is connected to a second transistor D8. Compared with the traditional circuit which only collects the reference voltage, the utility model increases the sampling of the live wire and the neutral wire of the power grid, which is used to determine the phase of the power grid, and controls the compressor according to the phase of the power grid. Through the software design, the motor can directly take power from the power grid as much as possible, and take power from the bus capacitor as little as possible, so that a large capacitor can be removed in the rectifier circuit, and a thin film capacitor is used instead.

[0025] The rectifier circuit comprises a unidirectional rectifier bridge DB1 and an equivalent thin film capacitor. The equivalent thin film capacitor is composed of a first thin film capacitor CF1 and a second thin film capacitor CF2 connected in parallel. The rectifier circuit outputs a reference voltage to supply the driving circuit and the sampling circuit. Since the thin film capacitor is used to replace the large electrolytic capacitor in the traditional circuit, the power factor correction part is omitted, the cost is reduced, and the problem of shortening the service life of the frequency converter caused by the electrolysis is eliminated, so that the reliability of the system is stronger.

[0026] The driving circuit is connected to the control chip and the reference voltage. The IGBT is controlled to work according to the information of the control chip, so as to control the variable frequency compressor to work.

[0027] The communication circuit is used for converting the compressor start-stop signal into high and low levels, and then transmitting to the chip.

[0028] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A variable frequency compressor drive based on an electrolysis-free solution, characterized in that, The application relates to a power supply circuit, which comprises an anti-regulation circuit, an anti-interference circuit, a rectifier circuit, a communication circuit, a voltage sampling circuit, a driving circuit and a control chip; the anti-regulation circuit and the anti-interference circuit do not comprise a harmonic inductor; the rectifier circuit comprises a single-direction rectifier bridge DB1 and equivalent film capacitors, and outputs a reference voltage; three groups of voltage sampling circuits with the same structure are arranged, wherein the first voltage sampling circuit is connected with a live wire of a power grid, the second voltage sampling circuit is connected with a zero line of the power grid, and the third voltage sampling circuit is connected with the reference voltage.

2. A variable frequency compressor drive based on electrolysis-free scheme according to claim 1, characterized in that, The equivalent film capacitors are composed of a first film capacitor CF1 and a second film capacitor CF2 in parallel.

3. A variable frequency compressor drive based on electrolysis-free scheme according to claim 1, characterized in that, The anti-regulation circuit comprises a first resistor R7, a second capacitor CX2, a third capacitor CY1 and a fourth capacitor CY2; the first resistor R7 is connected with the live wire and the zero line respectively; the second capacitor CX2 is connected with the first resistor R7 in parallel; the third capacitor CY1 is connected with the zero line and the ground wire respectively; and the fourth capacitor CY2 is connected with the live wire and the ground wire respectively.

4. A variable frequency compressor drive based on electrolysis-free scheme according to claim 1, characterized in that, The anti-interference circuit comprises a fuse FS1, a first pressure-sensitive resistor ZNR1, a second pressure-sensitive resistor ZNR2, a first capacitor CX1, a discharge tube DSA1 and a common-mode inductor FL1; the second pressure-sensitive resistor ZNR2 and the discharge tube DSA1 are connected in series on the live wire; the common-mode inductor FL1 comprises four pins, the first pin of the common-mode inductor FL1 is connected with the discharge tube DSA1, the second pin is connected with the second pressure-sensitive resistor ZNR2, the third and fourth pins are connected with the zero line; the first pressure-sensitive resistor is connected with the live wire and the zero line respectively; the first capacitor CX1 is connected with the first pressure-sensitive resistor ZNR1 in parallel; and the fuse FS1 is connected in series on the live wire.

5. A variable frequency compressor drive based on electrolysis-free scheme according to claim 1, characterized in that, The first voltage sampling circuit comprises a second resistor RM22, a third resistor RM10, a fourth resistor RM24, a fifth resistor RM25 and a sixth resistor RM11 connected in series; the second resistor RM22 is connected with the live wire of the power grid; one end of the sixth resistor RM11 is connected with the ground, and the other end is connected with a chip UM2; the sixth resistor RM11 is connected with a fifth capacitor CM3 and a first transistor D10 in parallel at its two ends; and the first transistor D10 is connected with a second transistor D8.

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