Inverter load side relay control circuit

Abstract

The utility model discloses an inverter load side relay control circuit comprising a boost circuit, an inverter circuit, a filter circuit, a first AC load circuit and a second AC load circuit. The booster circuit comprises a voltage sensor PT1 and a triode S1, a collector electrode of the triode S1 is electrically connected with a common end between a positive electrode of the diode D1 and the inductor L1, the voltage sensor PT1 is connected in parallel between a negative electrode of the diode D1 and an emitting electrode of the triode S1, and a capacitor C2 and a capacitor C3 are connected in parallel between the negative electrode of the diode D1 and the emitting electrode of the triode S1. The inverter load side relay control circuit disclosed by the utility model has the beneficial effects that the first alternating-current load circuit and the second alternating-current load circuit are respectively arranged, the first alternating-current load circuit is connected with a fixed load, and the second alternating-current load circuit can be connected with the load as required, so that the flexibility of accessing the load is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of power electronics, and in particular relates to a relay control circuit at the load side of an inverter. Background Art

[0002] The publication number is CN117559659A, the subject name is an invention patent application for a control circuit for an inverter load-side relay, and its IPC classification numbers are H02J13 / 00, G05B19 / 042, H02J3 / 38, and H02M7 / 48. Its technical solution discloses "including an inverter, an upgrade program control signal, a control chip 1, and a control chip 2 arranged in the inverter; an inverter circuit arranged in the inverter, and a power grid and a load connected to the inverter circuit; wherein the upgrade program control signal, the control chip 1, and the control chip 2 are connected to the control circuit; and the control circuit is connected to the inverter circuit."

[0003] However, the technical solution disclosed in the above invention patent application focuses on the control of the relay by the upgrade program. Figure 1 It also only shows the circuits related to the upgrade program for relay control, and does not extend to a complete circuit solution, nor does it reflect the flexibility of connecting to the load. Utility Model Content

[0004] The utility model aims at the prior art, overcomes the above defects and provides an inverter load side relay control circuit.

[0005] The utility model adopts the following technical solution. The inverter load side relay control circuit includes a boost circuit, an inverter circuit, a filter circuit, a first AC load circuit and a second AC load circuit, wherein:

[0006] The boost circuit includes a voltage sensor PT1 and a transistor S1, the collector of the transistor S1 and the common end between the positive electrode of the diode D1 and the inductor L1 are electrically connected, the voltage sensor PT1 is connected in parallel between the negative electrode of the diode D1 and the emitter of the transistor S1, and capacitors C2 and C3 are also connected in parallel between the negative electrode of the diode D1 and the emitter of the transistor S1;

[0007] The inverter circuit includes transistors S2, S3, S4 and S5, the collector of transistor S2 is electrically connected to the common end between capacitor C2 and the cathode of diode D1, the collector of transistor S4 is electrically connected to the common end between capacitor C2 and the cathode of diode D1, the emitter of transistor S5 is electrically connected to the common end between capacitor C3 and the emitter of transistor S1, the emitter of transistor S3 is electrically connected to the common end between capacitor C3 and the emitter of transistor S1, the emitter of transistor S2 is electrically connected to the collector of transistor S5, and the emitter of transistor S4 is electrically connected to the collector of transistor S3;

[0008] The filter circuit includes an inductor L2, an inductor L3, a capacitor C4, a capacitor C5 and a capacitor C6, the inductor L2 and a common end between the emitter of the transistor S4 and the collector of the transistor S3 are electrically connected, and the inductor L3 and a common end between the emitter of the transistor S2 and the collector of the transistor S5 are electrically connected;

[0009] The first AC load circuit includes a load relay RELAY1, a load relay RELAY2 and a load relay RELAY3, the load relay RELAY1 is connected to a load LOAD1, the load relay RELAY2 is connected to a load LOAD2, and the load relay RELAY3 is connected to a load LOAD3;

[0010] The second AC load circuit includes a load relay RELAY4 , a load relay RELAY5 , and a load relay RELAY6 .

[0011] As a further preferred technical solution of the above technical solution, the boost circuit also includes an inductor L1 and a capacitor C1. The capacitor C1 and the inductor L1 constitute a resonance unit. One end of the capacitor C1 is connected to the emitter of the transistor S1, and the other end of the capacitor C1 is connected to one end of the inductor L1.

[0012] As a further preferred technical solution of the above technical solution, the boost circuit further includes a voltage regulator diode D6, the anode of the voltage regulator diode D6 is connected to the emitter of the transistor S1, and the cathode of the voltage regulator diode D6 is connected to the collector of the transistor S1.

[0013] As a further preferred technical solution of the above technical solution, the inverter circuit further includes a Zener diode D2, a Zener diode D3, a Zener diode D4 and a Zener diode D5, wherein:

[0014] The positive electrode of the voltage zener diode D2 is connected to the emitter of the transistor S2, and the negative electrode of the voltage zener diode D2 is connected to the collector of the transistor S2;

[0015] The positive electrode of the voltage zener diode D3 is connected to the emitter of the transistor S3, and the negative electrode of the voltage zener diode D3 is connected to the collector of the transistor S3;

[0016] The positive electrode of the voltage zener diode D4 is connected to the emitter of the transistor S4, and the negative electrode of the voltage zener diode D4 is connected to the collector of the transistor S4;

[0017] The anode of the voltage stabilizing diode D5 is connected to the emitter of the transistor S5, and the cathode of the voltage stabilizing diode D5 is connected to the collector of the transistor S5.

[0018] As a further preferred technical solution of the above technical solution, the current amplification factors of transistor S2, transistor S3, transistor S4 and transistor S5 are consistent.

[0019] The inverter load-side relay control circuit disclosed by the utility model has the beneficial effect that, by respectively setting a first AC load circuit and a second AC load circuit, the first AC load circuit is connected to a fixed load (load LOAD1, load LOAD2, load LOAD3), and the second AC load circuit can be connected to a load as needed (not shown in the figure), thereby improving the flexibility of connecting the load. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is the main circuit structure diagram (circuit principle diagram) of this application. DETAILED DESCRIPTION

[0021] The utility model discloses a relay control circuit for an inverter load side. Figure 1 , the specific implementation methods of the utility model are further described.

[0022] See attached figure Figure 1 , Figure 1 The main circuit structure of the inverter load side relay control circuit is shown.

[0023] Example 1.

[0024] Preferably, the inverter load-side relay control circuit comprises a boost circuit, an inverter circuit, a filter circuit, a first AC load circuit and a second AC load circuit, wherein:

[0025] The boost circuit includes a voltage sensor PT1 and a transistor S1. The collector of the transistor S1 and the common end between the positive electrode of the diode D1 and the inductor L1 are electrically connected. The voltage sensor PT1 is connected in parallel between the negative electrode of the diode D1 and the emitter of the transistor S1. A capacitor C2 and a capacitor C3 are also connected in parallel between the negative electrode of the diode D1 and the emitter of the transistor S1, so as to boost the DC power from the input side of the inverter.

[0026] The inverter circuit includes transistors S2, S3, S4 and S5, the collector of transistor S2 is electrically connected to the common end between capacitor C2 and the cathode of diode D1, the collector of transistor S4 is electrically connected to the common end between capacitor C2 and the cathode of diode D1, the emitter of transistor S5 is electrically connected to the common end between capacitor C3 and the emitter of transistor S1, the emitter of transistor S3 is electrically connected to the common end between capacitor C3 and the emitter of transistor S1, the emitter of transistor S2 is electrically connected to the collector of transistor S5, and the emitter of transistor S4 is electrically connected to the collector of transistor S3; so that the inverter circuit outputs three-phase alternating currents of U, V and W;

[0027] The filter circuit includes an inductor L2, an inductor L3, a capacitor C4, a capacitor C5 and a capacitor C6. The common end between the inductor L2 and the emitter of the transistor S4 and the collector of the transistor S3 is electrically connected, and the common end between the inductor L3 and the emitter of the transistor S2 and the collector of the transistor S5 is electrically connected; so that any two phases of the three-phase alternating current are equivalent to being connected to the filter, thereby improving the power quality of the U, V, W three-phase alternating current output by the inverter circuit;

[0028] The first AC load circuit includes a load relay RELAY1, a load relay RELAY2 and a load relay RELAY3, wherein the load relay RELAY1 is connected to a load LOAD1, the load relay RELAY2 is connected to a load LOAD2, and the load relay RELAY3 is connected to a load LOAD3 to form a three-phase AC load;

[0029] The second AC load circuit includes load relays RELAY4, RELAY5 and RELAY6, so that load relays RELAY4, RELAY5 and RELAY6 can be connected to loads (not shown in the figure) as needed, thereby improving the flexibility of connecting to loads.

[0030] The boost circuit further includes an inductor L1 and a capacitor C1. The capacitor C1 and the inductor L1 form a resonance unit. One end of the capacitor C1 is connected to the emitter of the transistor S1, and the other end of the capacitor C1 is connected to one end of the inductor L1.

[0031] The boost circuit further includes a voltage regulator diode D6 , the anode of the voltage regulator diode D6 is connected to the emitter of the transistor S1 , and the cathode of the voltage regulator diode D6 is connected to the collector of the transistor S1 .

[0032] The inverter circuit further includes a voltage regulator diode D2, a voltage regulator diode D3, a voltage regulator diode D4 and a voltage regulator diode D5, wherein:

[0033] The positive electrode of the voltage zener diode D2 is connected to the emitter of the transistor S2, and the negative electrode of the voltage zener diode D2 is connected to the collector of the transistor S2;

[0034] The positive electrode of the voltage zener diode D3 is connected to the emitter of the transistor S3, and the negative electrode of the voltage zener diode D3 is connected to the collector of the transistor S3;

[0035] The positive electrode of the voltage zener diode D4 is connected to the emitter of the transistor S4, and the negative electrode of the voltage zener diode D4 is connected to the collector of the transistor S4;

[0036] The anode of the voltage stabilizing diode D5 is connected to the emitter of the transistor S5, and the cathode of the voltage stabilizing diode D5 is connected to the collector of the transistor S5.

[0037] Among them, the current amplification factors of transistor S2, transistor S3, transistor S4 and transistor S5 are consistent, so as to output U, V, W three-phase alternating current in a balanced manner.

[0038] Example 2.

[0039] Embodiment 2, based on embodiment 1, also includes the following technical solutions.

[0040] Among them, the inverter load side relay control circuit also includes a control circuit, which includes a voltage sensor PT2, a current sensor CT1, a current sensor CT2 and a current sensor CT3. The voltage sensor PT2 is connected to the second AC load circuit, and the current sensor CT1, the current sensor CT2 and the current sensor CT3 are connected to the first AC load circuit. The voltage sensor PT2, the current sensor CT1, the current sensor CT2 and the current sensor CT3 are connected to the microprocessor U1 at the same time.

[0041] It should be noted that how the microprocessor U1 controls the load relay RELAY1 and other relays can be found in the prior art such as CN117559659A recorded in the background technology, which does not belong to the beneficial effects and technical effects requested for protection in this application.

[0042] It is worth mentioning that the technical features such as the specific model of the microprocessor U1 involved in this utility model patent application should be regarded as the prior art. The specific structure, working principle and possible control method and spatial layout method of these technical features can be selected by conventional methods in the field, and should not be regarded as the inventive point of this utility model patent. This utility model patent will not be further elaborated.

[0043] For those skilled in the art, it is still possible to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model should be included in the protection scope of the present utility model.

Claims

1. An inverter load side relay control circuit, characterized in that: It includes a boost circuit, an inverter circuit, a filter circuit, a first AC load circuit and a second AC load circuit, wherein: The boost circuit includes a voltage sensor PT1 and a transistor S1, the collector of the transistor S1 and the common end between the positive electrode of the diode D1 and the inductor L1 are electrically connected, the voltage sensor PT1 is connected in parallel between the negative electrode of the diode D1 and the emitter of the transistor S1, and capacitors C2 and C3 are also connected in parallel between the negative electrode of the diode D1 and the emitter of the transistor S1; The inverter circuit includes transistors S2, S3, S4 and S5, the collector of transistor S2 is electrically connected to the common end between capacitor C2 and the cathode of diode D1, the collector of transistor S4 is electrically connected to the common end between capacitor C2 and the cathode of diode D1, the emitter of transistor S5 is electrically connected to the common end between capacitor C3 and the emitter of transistor S1, the emitter of transistor S3 is electrically connected to the common end between capacitor C3 and the emitter of transistor S1, the emitter of transistor S2 is electrically connected to the collector of transistor S5, and the emitter of transistor S4 is electrically connected to the collector of transistor S3; The filter circuit includes an inductor L2, an inductor L3, a capacitor C4, a capacitor C5 and a capacitor C6, the inductor L2 and a common end between the emitter of the transistor S4 and the collector of the transistor S3 are electrically connected, and the inductor L3 and a common end between the emitter of the transistor S2 and the collector of the transistor S5 are electrically connected; The first AC load circuit includes a load relay RELAY1, a load relay RELAY2 and a load relay RELAY3, the load relay RELAY1 is connected to a load LOAD1, the load relay RELAY2 is connected to a load LOAD2, and the load relay RELAY3 is connected to a load LOAD3; The second AC load circuit includes a load relay RELAY4 , a load relay RELAY5 , and a load relay RELAY6 .

2. The inverter load side relay control circuit according to claim 1, characterized in that: The boost circuit also includes an inductor L1 and a capacitor C1. The capacitor C1 and the inductor L1 form a resonance unit. One end of the capacitor C1 is connected to the emitter of the transistor S1, and the other end of the capacitor C1 is connected to one end of the inductor L1.

3. The inverter load side relay control circuit according to claim 2, characterized in that: The boost circuit further includes a voltage regulator diode D6, the anode of the voltage regulator diode D6 is connected to the emitter of the transistor S1, and the cathode of the voltage regulator diode D6 is connected to the collector of the transistor S1.

4. The inverter load side relay control circuit according to claim 1, characterized in that: The inverter circuit also includes a Zener diode D2, a Zener diode D3, a Zener diode D4 and a Zener diode D5, wherein: The positive electrode of the voltage zener diode D2 is connected to the emitter of the transistor S2, and the negative electrode of the voltage zener diode D2 is connected to the collector of the transistor S2; The positive electrode of the voltage zener diode D3 is connected to the emitter of the transistor S3, and the negative electrode of the voltage zener diode D3 is connected to the collector of the transistor S3; The positive electrode of the voltage zener diode D4 is connected to the emitter of the transistor S4, and the negative electrode of the voltage zener diode D4 is connected to the collector of the transistor S4; The anode of the voltage stabilizing diode D5 is connected to the emitter of the transistor S5, and the cathode of the voltage stabilizing diode D5 is connected to the collector of the transistor S5.

5. The inverter load side relay control circuit according to claim 1, characterized in that: The current amplification factors of transistor S2, transistor S3, transistor S4 and transistor S5 are consistent.

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