Alternating current load switch control circuit

Abstract

The utility model discloses an alternating current load switch control circuit, which relates to the technical field of alternating current loads and comprises a power supply module used for accessing power supply electric energy, rectifying, filtering and stabilizing voltage; the electric energy type detection module is used for detecting whether the power supply electric energy is alternating current or direct current, controlling the first switch module to transmit the power supply electric energy to the alternating current load module when the power supply electric energy is alternating current, and controlling the second switch module to transmit the power supply electric energy to the inversion control module when the power supply electric energy is direct current; the inversion control module is used for performing inversion processing on the power supply electric energy; and the alternating current load module is used for receiving the power supply electric energy transmitted by the second switch module and the electric energy output after inversion of the inversion control module and supplying power to a connected alternating current load. The AC load switch control circuit can automatically select a proper switch path according to the electric energy type of the power supply electric energy, the circuit intelligence is high, and the power supply efficiency of the AC load module is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of AC loads, in particular to an AC load switch control circuit. Background Art

[0002] AC load refers to equipment or systems that can consume AC power. Some AC loads, such as refrigerators, radios, etc., are prone to burn out when powered by DC power, causing economic losses. In order to avoid providing DC power, relevant personnel are required to perform AC and DC detection of the provided power through a multimeter in advance when powering the AC load. The detection method is relatively complicated, and it is impossible to automatically perform reasonable power supply control according to the AC and DC states of the power supply. The circuit intelligence is low, so it needs to be improved. Utility Model Content

[0003] The embodiment of the utility model provides an AC load switch control circuit to solve the problems raised in the above background technology.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] An AC load switch control circuit comprises: a power supply module, an electric energy type detection module, a first switch module, a second switch module, an inverter control module and an AC load module;

[0006] A power module, used for receiving power supply energy, rectifying, filtering and stabilizing the power supply energy and outputting the first power energy;

[0007] an electric energy type detection module, connected to the power supply module, for receiving the first electric energy, performing an isolated power supply detection on the power supply electric energy and outputting a first detection signal, performing a direct current isolation and an alternating current processing on the power supply electric energy and performing an isolated power supply detection on the AC power passing through, and outputting a second detection signal, outputting a first control signal when the first detection signal and the second detection signal are received at the same time, and outputting a second control signal when the first detection signal is received and the second detection signal is not received;

[0008] A first switch module, connected to the power module, the power type detection module and the AC load module, for receiving the first power and transmitting the power supply power to the AC load module upon receiving a first control signal;

[0009] a second switch module, connected to the power module, the power type detection module and the inverter control module, and configured to receive the first power and transmit the power supply power to the inverter control module upon receiving a second control signal;

[0010] An inverter control module, used for inverting the power supply energy transmitted by the second switch module and outputting the second power;

[0011] The AC load module is connected to the first switch module and the inverter control module, and is used to receive the power supply energy transmitted by the second switch module and the second power output by the inverter control module and to supply power to the connected AC load.

[0012] As a further solution of the utility model: the power module includes an input interface, a first rectifier, a second capacitor and a first diode; the first switch module includes a first relay and a first switch tube; the second switch module includes a second relay and a second switch tube;

[0013] Preferably, the first end and the second end of the input interface are respectively connected to the first end and the second end of the first rectifier, the third end of the first rectifier is connected to one end of the second capacitor, the cathode of the first diode, one end of the first relay and one end of the second relay, the fourth end of the first rectifier, the other end of the second capacitor, the anode of the first diode, the emitter of the first switch tube and the emitter of the second switch tube are all grounded, the base of the first switch tube and the base of the second switch tube are connected to the electric energy type detection module, the collector of the first switch tube is connected to the other end of the first relay, and the collector of the second switch tube is connected to the other end of the second relay.

[0014] As a further solution of the utility model: the electric energy type detection module includes a first resistor, a first optical coupler, a second resistor, a first capacitor, a third resistor, a second optical coupler and a fourth resistor;

[0015] Preferably, the first end of the first optocoupler is connected to one end of the first capacitor and the first end of the input interface through the first resistor, the second end of the first optocoupler and the second end of the second optocoupler are both connected to the second end of the input interface, the third end of the first optocoupler and the third end of the second optocoupler are both connected to the third end of the first rectifier, the fourth end of the first optocoupler is grounded through the second resistor, the fourth end of the second optocoupler is grounded through the fourth resistor, and the first end of the second optocoupler is connected to the other end of the first capacitor through the third resistor.

[0016] As a further solution of the utility model: the electric energy type detection module also includes a first logic chip and a second logic chip;

[0017] Preferably, the A end of the first logic chip and the B end of the second logic chip are both connected to the fourth end of the second optocoupler, the B end of the first logic chip and the A end of the second logic chip are both connected to the fourth end of the first optocoupler, the F end of the first optocoupler is connected to the base of the second switching tube, and the F end of the second optocoupler is connected to the base of the first switching tube.

[0018] As a further solution of the utility model: the first switch module further includes a first relay switch; the second switch module further includes a second relay switch; the AC load module includes a first transformer and an AC load interface;

[0019] Preferably, the moving end of the first relay switch and the moving end of the second relay switch are both connected to the first end of the input interface, the fixed end of the first relay switch is connected to the first end of the primary side of the first transformer, the second end of the primary side of the first transformer is connected to the second end of the input interface, the first end and the second end of the secondary side of the first transformer are respectively connected to the first end and the second end of the AC load interface, and the fixed end of the second relay switch is connected to the inverter control module.

[0020] As a further solution of the utility model: the inverter control module includes a fifth resistor, a sixth resistor, a third switch tube, a fourth switch tube and a second transformer;

[0021] Preferably, the first end of the primary side of the second transformer is connected to the collector of the third switch tube and is connected to the base of the fourth switch tube through a sixth resistor, the second end of the primary side of the second transformer is connected to the fixed end of the second relay switch, the third end of the primary side of the second transformer is connected to the collector of the fourth switch tube and is connected to the base of the third switch tube through a fifth resistor, and the emitter of the third switch tube and the emitter of the fourth switch tube are both connected to the second end of the input interface.

[0022] Compared with the prior art, the beneficial effects of the utility model are as follows: the AC load switch control circuit of the utility model detects the power type of the power supply energy connected to the power module by the power type detection module, and when the power supply energy is AC power, the first switch module directly transmits the power supply energy to the AC load module; when the power supply energy is DC power, the power type detection module controls the second switch module to perform power transmission, and then the inverter control module inverts the power transmitted by the second switch module to power the AC load module; the appropriate switch path can be automatically selected according to the power type of the power supply energy; the circuit has high intelligence, and the power supply efficiency of the AC load module is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments of the utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 The present invention provides a schematic block diagram of an AC load switch control circuit.

[0025] Figure 2 A circuit diagram of an AC load switch control circuit provided in an example of the utility model.

[0026] Figure 3This is a connection circuit diagram of the inverter control module provided by the example of the utility model. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] In one embodiment, see Figure 1 , an AC load switch control circuit, comprising: a power supply module 1, an electric energy type detection module 2, a first switch module 3, a second switch module 4, an inverter control module 5 and an AC load module 6;

[0029] Specifically, the power supply module 1 is used to receive the power supply energy, rectify, filter and stabilize the power supply energy and output the first power;

[0030] an electric energy type detection module 2, connected to the power supply module 1, for receiving the first electric energy, performing an isolated power supply detection on the power supply electric energy and outputting a first detection signal, performing a direct current isolation and an alternating current processing on the power supply electric energy and performing an isolated power supply detection on the AC power passing through, and outputting a second detection signal, outputting a first control signal when the first detection signal and the second detection signal are received at the same time, and outputting a second control signal when the first detection signal is received and the second detection signal is not received;

[0031] A first switch module 3, connected to the power module 1, the power type detection module 2 and the AC load module 6, for receiving the first power and transmitting the power supply power to the AC load module 6 when receiving the first control signal;

[0032] A second switch module 4 is connected to the power module 1, the power type detection module 2 and the inverter control module 5, and is used to receive the first power and transmit the power supply power to the inverter control module 5 when receiving the second control signal;

[0033] The inverter control module 5 is used to invert the power supply energy transmitted by the second switch module 4 and output the second power;

[0034] The AC load module 6 is connected to the first switch module 3 and the inverter control module 5, and is used to receive the power supply energy transmitted by the second switch module 4 and the second power output by the inverter control module 5 and to supply power to the connected AC load.

[0035] In a specific embodiment, the power supply module 1 may adopt a power supply circuit composed of an input port, a rectifier, a diode, etc., which may be connected to the power supply and perform rectification, filtering and voltage stabilization on the power supply; the power type detection module 2 may adopt a power type detection circuit composed of a photocoupler, a capacitor, a logic chip, etc., which may be used to determine whether the power supply connected to the power supply module 1 is AC or DC; the first switch module 3 may adopt a first switch circuit composed of a relay, a transistor and a relay switch, which is controlled by the power type detection module 2 to perform power transmission; the second switch module 4 may adopt a second switch circuit composed of a relay, a transistor and a relay switch, which is controlled by the power type detection module 2 to perform power transmission; the inverter control module 5 may adopt an inverter control circuit composed of a transistor, a resistor and a transformer, which may perform inversion on the power transmitted by the second switch module 4; the AC load module 6 may adopt an AC load circuit composed of a transformer and an AC load interface to receive power and supply power to the connected AC load.

[0036] In another embodiment, see Figure 1 , Figure 2 and Figure 3 The power module 1 includes an input interface, a first rectifier T1, a second capacitor C2 and a first diode D1; the first switch module 3 includes a first relay K1 and a first switch tube V1; the second switch module 4 includes a second relay K2 and a second switch tube V2;

[0037] Specifically, the first end and the second end of the input interface are respectively connected to the first end and the second end of the first rectifier T1, the third end of the first rectifier T1 is connected to one end of the second capacitor C2, the cathode of the first diode D1, one end of the first relay K1 and one end of the second relay K2, the fourth end of the first rectifier T1, the other end of the second capacitor C2, the anode of the first diode D1, the emitter of the first switch tube V1 and the emitter of the second switch tube V2 are all grounded, the base of the first switch tube V1 and the base of the second switch tube V2 are connected to the electric energy type detection module 2, the collector of the first switch tube V1 is connected to the other end of the first relay K1, and the collector of the second switch tube V2 is connected to the other end of the second relay K2.

[0038] In a specific embodiment, both the first switch tube V1 and the second switch tube V2 can be selected from NPN transistors.

[0039] Further, the electric energy type detection module 2 includes a first resistor R1, a first optical coupler J1, a second resistor R2, a first capacitor C1, a third resistor R3, a second optical coupler J2 and a fourth resistor R4;

[0040] Specifically, the first end of the first optocoupler J1 is connected to one end of the first capacitor C1 and the first end of the input interface through the first resistor R1, the second end of the first optocoupler J1 and the second end of the second optocoupler J2 are both connected to the second end of the input interface, the third end of the first optocoupler J1 and the third end of the second optocoupler J2 are both connected to the third end of the first rectifier T1, the fourth end of the first optocoupler J1 is grounded through the second resistor R2, the fourth end of the second optocoupler J2 is grounded through the fourth resistor R4, and the first end of the second optocoupler J2 is connected to the other end of the first capacitor C1 through the third resistor R3.

[0041] In a specific embodiment, both the first optical coupler J1 and the second optical coupler J2 can be selected from TLP620 photoelectric couplers; the first capacitor C1 performs DC isolation and AC pass processing.

[0042] Furthermore, the electric energy type detection module 2 also includes a first logic chip U1 and a second logic chip U2;

[0043] Specifically, the A end of the first logic chip U1 and the B end of the second logic chip U2 are both connected to the fourth end of the second optocoupler J2, the B end of the first logic chip U1 and the A end of the second logic chip U2 are both connected to the fourth end of the first optocoupler J1, the F end of the first optocoupler J1 is connected to the base of the second switch tube V2, and the F end of the second optocoupler J2 is connected to the base of the first switch tube V1.

[0044] In a specific embodiment, the first logic chip U1 may be an XOR gate chip; the second logic chip U2 may be an AND gate chip.

[0045] Furthermore, the first switch module 3 further includes a first relay switch K1-1; the second switch module 4 further includes a second relay switch K2-1; the AC load module 6 includes a first transformer B1 and an AC load interface;

[0046] Specifically, the moving end of the first relay switch K1-1 and the moving end of the second relay switch K2-1 are both connected to the first end of the input interface, the fixed end of the first relay switch K1-1 is connected to the first end of the primary side of the first transformer B1, the second end of the primary side of the first transformer B1 is connected to the second end of the input interface, the first end and the second end of the secondary side of the first transformer B1 are respectively connected to the first end and the second end of the AC load interface, and the fixed end of the second relay switch K2-1 is connected to the inverter control module 5.

[0047] In a specific embodiment, both the first relay switch K1-1 and the second relay switch K2-1 can be normally open switches, wherein the first relay switch K1-1 is controlled by the first relay K1 through magnetic attraction, and the second relay switch K2-1 is controlled by the second relay K2 through magnetic attraction.

[0048] Furthermore, the inverter control module 5 includes a fifth resistor R5, a sixth resistor R6, a third switch tube V3, a fourth switch tube V4 and a second transformer B2;

[0049] Specifically, the first end of the primary side of the second transformer B2 is connected to the collector of the third switch tube V3 and is connected to the base of the fourth switch tube V4 through the sixth resistor R6, the second end of the primary side of the second transformer B2 is connected to the fixed end of the second relay switch K2-1, the third end of the primary side of the second transformer B2 is connected to the collector of the fourth switch tube V4 and is connected to the base of the third switch tube V3 through the fifth resistor R5, and the emitter of the third switch tube V3 and the emitter of the fourth switch tube V4 are both connected to the second end of the input interface.

[0050] In a specific embodiment, both the fourth switch tube V4 and the third switch tube V3 can be NPN transistors.

[0051] In an AC load switch control circuit of the present embodiment, power supply energy is connected to the input interface, and the first rectifier T1, the second capacitor C2 and the first diode D1 perform rectification, filtering and voltage stabilization on the power supply energy so as to supply power to the first optocoupler J1 and the second optocoupler J2. At the same time, the first optocoupler J1 is turned on, so that the fourth end of the first optocoupler J1 becomes a high level. When the power supply energy is AC power, the first capacitor C1 transmits the power supply energy and triggers the second optocoupler J2 to turn on, so that the fourth end of the second optocoupler J2 becomes a high level. The A end and the B end of the second logic chip U2 are both high levels, so that the F end of the second logic chip U2 outputs a high level and controls the first switch tube V1 to turn on, and the first relay K1 is energized and controls the first relay The switch K1-1 is closed, and the power supply energy is transmitted to the first transformer B1 through the first relay switch K1-1, and after being transformed by the first transformer B1, it is transmitted to the AC load connected to the AC load interface. When the power supply energy is DC, the second optocoupler J2 is cut off, and the fourth end of the second optocoupler J2 is at a low level, so that the F end of the first logic chip U1 outputs a high level, and then controls the second switch tube V2 to be turned on, and the second relay K2 is energized to control the second relay switch K2-1 to be closed. The power supply energy will be transmitted to the second transformer B2, and the third switch tube V3, the fourth switch tube V4, the fifth resistor R5 and the sixth resistor R6 are used to invert the power supply energy, and the inverted energy is transmitted to the AC load connected to the AC load interface.

[0052] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0053] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An AC load switch control circuit, characterized in that: The AC load switch control circuit comprises: a power supply module, an electric energy type detection module, a first switch module, a second switch module, an inverter control module and an AC load module; The power supply module is used to receive power supply energy, perform rectification, filtering and voltage stabilization on the power supply energy and output the first power energy; The electric energy type detection module is connected to the power supply module, and is used to receive the first electric energy, perform isolated power supply detection on the power supply electric energy and output a first detection signal, perform DC isolation and AC pass processing on the power supply electric energy and perform isolated power supply detection on the AC power passing through, and output a second detection signal, and output a first control signal when the first detection signal and the second detection signal are received at the same time, and output a second control signal when the first detection signal is received and the second detection signal is not received; The first switch module is connected to the power supply module, the power type detection module and the AC load module, and is used to receive the first power and transmit the power supply power to the AC load module when receiving the first control signal; The second switch module is connected to the power supply module, the power type detection module and the inverter control module, and is used to receive the first power and transmit the power supply power to the inverter control module when receiving the second control signal; The inverter control module is used to invert the power supply energy transmitted by the second switch module and output the second power; The AC load module is connected to the first switch module and the inverter control module, and is used to receive the power supply energy transmitted by the second switch module and the second power output by the inverter control module and to supply power to the connected AC load.

2. The AC load switch control circuit according to claim 1, characterized in that: The power module includes an input interface, a first rectifier, a second capacitor and a first diode; the first switch module includes a first relay and a first switch tube; the second switch module includes a second relay and a second switch tube; The first end and the second end of the input interface are respectively connected to the first end and the second end of the first rectifier, the third end of the first rectifier is connected to one end of the second capacitor, the cathode of the first diode, one end of the first relay and one end of the second relay, the fourth end of the first rectifier, the other end of the second capacitor, the anode of the first diode, the emitter of the first switch tube and the emitter of the second switch tube are all grounded, the base of the first switch tube and the base of the second switch tube are connected to the electric energy type detection module, the collector of the first switch tube is connected to the other end of the first relay, and the collector of the second switch tube is connected to the other end of the second relay.

3. The AC load switch control circuit according to claim 2, characterized in that: The electric energy type detection module includes a first resistor, a first optical coupler, a second resistor, a first capacitor, a third resistor, a second optical coupler and a fourth resistor; The first end of the first optocoupler is connected to one end of the first capacitor and the first end of the input interface through the first resistor, the second end of the first optocoupler and the second end of the second optocoupler are both connected to the second end of the input interface, the third end of the first optocoupler and the third end of the second optocoupler are both connected to the third end of the first rectifier, the fourth end of the first optocoupler is grounded through the second resistor, the fourth end of the second optocoupler is grounded through the fourth resistor, and the first end of the second optocoupler is connected to the other end of the first capacitor through the third resistor.

4. The AC load switch control circuit according to claim 3, characterized in that: The electric energy type detection module also includes a first logic chip and a second logic chip; The A end of the first logic chip and the B end of the second logic chip are both connected to the fourth end of the second optocoupler, the B end of the first logic chip and the A end of the second logic chip are both connected to the fourth end of the first optocoupler, the F end of the first optocoupler is connected to the base of the second switch tube, and the F end of the second optocoupler is connected to the base of the first switch tube.

5. The AC load switch control circuit according to claim 2, characterized in that: The first switch module further includes a first relay switch; the second switch module further includes a second relay switch; the AC load module includes a first transformer and an AC load interface; The moving end of the first relay switch and the moving end of the second relay switch are both connected to the first end of the input interface, the fixed end of the first relay switch is connected to the first end of the primary side of the first transformer, the second end of the primary side of the first transformer is connected to the second end of the input interface, the first end and the second end of the secondary side of the first transformer are respectively connected to the first end and the second end of the AC load interface, and the fixed end of the second relay switch is connected to the inverter control module.

6. The AC load switch control circuit according to claim 5, characterized in that: The inverter control module includes a fifth resistor, a sixth resistor, a third switch tube, a fourth switch tube and a second transformer; The first end of the primary side of the second transformer is connected to the collector of the third switch tube and is connected to the base of the fourth switch tube through the sixth resistor, the second end of the primary side of the second transformer is connected to the fixed end of the second relay switch, the third end of the primary side of the second transformer is connected to the collector of the fourth switch tube and is connected to the base of the third switch tube through the fifth resistor, and the emitter of the third switch tube and the emitter of the fourth switch tube are both connected to the second end of the input interface.

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