Photovoltaic inverter relay power supply switching circuit

Abstract

The utility model relates to the technical field of relays, in particular to a photovoltaic inverter relay power supply switching circuit, which comprises an MOS (Metal Oxide Semiconductor) tube Q12, an MOS tube Q19, a diode D40 and a diode D43, the grid electrode of the MOS tube Q12 is electrically connected with the power utilization control signal end of an external controller, the source electrode of the MOS tube Q12 is electrically connected with the grid electrode of the MOS tube Q19, and the grid electrode of the MOS tube Q19 is electrically connected with the power utilization control signal end of the external controller. The grid electrode of the MOS tube Q19 is connected with the source electrode of the MOS tube Q19, one end of the MOS tube Q19 is electrically connected with a first power supply control end of a relay power supply, the source electrode of the MOS tube Q19 is electrically connected with the cathode of a diode D40 and the cathode of a diode D43, and one end of the MOS tube Q19 is electrically connected with a second power supply control end of the relay power supply after the anode of the diode D40 is connected with the anode of the diode D43. Therefore, the power supply voltage of the relay can be adjusted as required through an external circuit, and the power loss in the operation process of the relay is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of relays, and in particular to a photovoltaic inverter relay power switching circuit. Background Art

[0002] A relay is an electrical control device. When the change of input quantity (excitation quantity) reaches the specified requirement, it causes the controlled quantity to undergo a predetermined step change in the electrical output circuit. It has an interactive relationship between the control system (also known as the input circuit) and the controlled system (also known as the output circuit). It is usually used in automated control circuits. It is actually an "automatic switch" that uses a small current to control the operation of a large current. It plays the role of automatic adjustment, safety protection, and circuit conversion in the circuit.

[0003] Existing relay power supply circuits all use fixed voltage to power the relay, and cannot achieve voltage switching, resulting in large losses during relay operation, causing the temperature of the relay body to rise, reducing the service life of the relay, and affecting the efficiency of the entire machine. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a photovoltaic inverter relay power switching circuit, which can reduce the power loss during the operation of the relay and reduce the temperature of the relay, thereby extending the service life of the relay and improving the overall efficiency of the photovoltaic inverter.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] A photovoltaic inverter relay power switching circuit, characterized in that it includes a MOS tube Q12, a MOS tube Q19, a diode D40 and a diode D43, the gate of the MOS tube Q12 is electrically connected to the power control signal end of the external controller, the source of the MOS tube Q12 is electrically connected to the gate of the MOS tube Q19, the drain of the MOS tube Q12 is grounded, the gate of the MOS tube Q19 is electrically connected to the source of the MOS tube Q19, and the end after the gate of the MOS tube Q19 is connected to the source of the MOS tube Q19 is electrically connected to a first power supply control end of the relay power supply, the source of the MOS tube Q19 is electrically connected to the cathode of the diode D40 and the cathode of the diode D43 respectively, the anode of the diode D40 is electrically connected to the anode of the diode D43, and the end after the anode of the diode D40 is connected to the anode of the diode D43 is electrically connected to a second power supply control end of the relay power supply.

[0007] Furthermore, it also includes a resistor R236 and a resistor R235, one end of the resistor R236 is electrically connected to the source of the MOS tube Q19 and the first power supply control end of the relay power supply, respectively, the other end of the resistor R236 is electrically connected to the gate of the MOS tube Q19 and one end of the resistor R235, respectively, and the other end of the resistor R235 is electrically connected to the drain of the MOS tube Q12.

[0008] Furthermore, it also includes a resistor R233 and a resistor R234, one end of the resistor R234 is electrically connected to the power control signal end of the external controller, the other end of the resistor R234 is electrically connected to one end of the resistor R234 and the gate of the MOS tube Q12 respectively, the other end of the resistor R234 is electrically connected to the source of the MOS tube Q12 and the other end of the resistor R234 is grounded.

[0009] Furthermore, it includes a capacitor C111, one end of which is electrically connected to the other end of the resistor R233, one end of the resistor R234 and the gate of the MOS tube Q12, and the other end of the capacitor C111 is electrically connected to the other end of the resistor R234 and the source of the MOS tube Q12, and the other end of the capacitor C111 is grounded.

[0010] Furthermore, the MOS transistor Q12 is an N-type MOS transistor, and the MOS transistor Q19 is a P-type MOS transistor.

[0011] The beneficial effects of the utility model are:

[0012] In this solution, by setting MOS tube Q12, MOS tube Q19, diode D40 and diode D43, the power control signal end of the controller gives a high level signal to the gate of MOS tube Q12, so that the V GS is greater than its turn-on threshold voltage, MOS tube Q12 is turned on, and the gate of MOS tube Q19 is pulled down to ground, making V GS When the voltage of the MOS tube Q12 is greater than the opening threshold voltage, the MOS tube Q19 is turned on, and the relay power supply is powered by the power supply of the first power supply end of the relay power supply through the MOS tube Q19; when the relay is successfully attracted and the power supply of the second power supply end of the relay power supply is needed as the relay power supply, the power control signal end of the controller gives a low level signal to the gate of the MOS tube Q12, so that the V GS is less than its turn-on threshold voltage, MOS tube Q12 is disconnected, and the gate of MOS tube Q19 is in high impedance state, making V GSWhen the voltage of the relay is lower than the turn-on threshold voltage, the MOS tube Q19 is disconnected. At this time, the relay power supply is supplied by the power supply of the second power supply terminal through the diode D40 and the diode D43. In this way, the power supply voltage of the relay can be adjusted as needed through the external circuit, thereby reducing the power loss during the operation of the relay and reducing the temperature of the relay, thereby extending the service life of the relay and improving the overall efficiency of the photovoltaic inverter. Due to the presence of the diode D40 and the diode D43, when the relay power supply is turned on, the conduction power consumption is reduced to 1 / 4 of the original, the relay power loss is significantly reduced, and the service life of the device and the overall life of the photovoltaic inverter are greatly enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The utility model is a circuit schematic diagram of a photovoltaic inverter relay power switching circuit. DETAILED DESCRIPTION

[0014] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in conjunction with the implementation modes and the accompanying drawings.

[0015] Please refer to Figure 1 , the technical solution adopted by the utility model is:

[0016] A photovoltaic inverter relay power switching circuit comprises a MOS tube Q12, a MOS tube Q19, a diode D40 and a diode D43, wherein the gate of the MOS tube Q12 is electrically connected to a power control signal terminal of an external controller, the source of the MOS tube Q12 is electrically connected to the gate of the MOS tube Q19, the drain of the MOS tube Q12 is grounded, the gate of the MOS tube Q19 is electrically connected to the source of the MOS tube Q19, and one end of the gate of the MOS tube Q19 connected to the source of the MOS tube Q19 is electrically connected to a first power supply control terminal of a relay power supply, the source of the MOS tube Q19 is electrically connected to a cathode of the diode D40 and a cathode of the diode D43 respectively, the anode of the diode D40 is electrically connected to an anode of the diode D43, and one end of the anode of the diode D40 connected to the anode of the diode D43 is electrically connected to a second power supply control terminal of the relay power supply.

[0017] From the above description, it can be seen that the beneficial effects of the utility model are:

[0018] In this solution, by setting MOS tube Q12, MOS tube Q19, diode D40 and diode D43, the power control signal end of the controller gives a high level signal to the gate of MOS tube Q12, so that the V GS is greater than its turn-on threshold voltage, MOS tube Q12 is turned on, and the gate of MOS tube Q19 is pulled down to ground, making V GSWhen the voltage of the MOS tube Q12 is greater than the opening threshold voltage, the MOS tube Q19 is turned on, and the relay power supply is powered by the power supply of the first power supply end of the relay power supply through the MOS tube Q19; when the relay is successfully attracted and the power supply of the second power supply end of the relay power supply is needed as the relay power supply, the power control signal end of the controller gives a low level signal to the gate of the MOS tube Q12, so that the V GS is less than its turn-on threshold voltage, MOS tube Q12 is disconnected, and the gate of MOS tube Q19 is in high impedance state, making V GS When the voltage of the relay is lower than the turn-on threshold voltage, the MOS tube Q19 is disconnected. At this time, the relay power supply is supplied by the power supply of the second power supply terminal through the diode D40 and the diode D43. In this way, the power supply voltage of the relay can be adjusted as needed through the external circuit, thereby reducing the power loss during the operation of the relay and reducing the temperature of the relay, thereby extending the service life of the relay and improving the overall efficiency of the photovoltaic inverter. Due to the presence of the diode D40 and the diode D43, when the relay power supply is turned on, the conduction power consumption is reduced to 1 / 4 of the original, the relay power loss is significantly reduced, and the service life of the device and the overall life of the photovoltaic inverter are greatly enhanced.

[0019] Furthermore, it also includes a resistor R236 and a resistor R235, one end of the resistor R236 is electrically connected to the source of the MOS tube Q19 and the first power supply control end of the relay power supply, respectively, the other end of the resistor R236 is electrically connected to the gate of the MOS tube Q19 and one end of the resistor R235, respectively, and the other end of the resistor R235 is electrically connected to the drain of the MOS tube Q12.

[0020] From the above description, it can be known that the resistor R236 provides a bias voltage to the gate of the MOS tube Q19, and the resistor R235 is a current limiting resistor.

[0021] Furthermore, it also includes a resistor R233 and a resistor R234, one end of the resistor R234 is electrically connected to the power control signal end of the external controller, the other end of the resistor R234 is electrically connected to one end of the resistor R234 and the gate of the MOS tube Q12 respectively, the other end of the resistor R234 is electrically connected to the source of the MOS tube Q12 and the other end of the resistor R234 is grounded.

[0022] From the above description, it can be seen that the resistor R233 is the driving resistor of the MOS tube Q12, which can limit the driving current and suppress the driving waveform oscillation; the resistor R234 is the pull-down resistor of the MOS tube Q12, which pulls the gate level of the MOS tube Q12 down to the ground when there is no driving signal to prevent the MOS tube Q12 from being turned on by mistake.

[0023] Furthermore, it includes a capacitor C111, one end of which is electrically connected to the other end of the resistor R233, one end of the resistor R234 and the gate of the MOS tube Q12, and the other end of the capacitor C111 is electrically connected to the other end of the resistor R234 and the source of the MOS tube Q12, and the other end of the capacitor C111 is grounded.

[0024] From the above description, it can be seen that the function of the capacitor C111 is to suppress the oscillation that may be generated by the driving waveform of the MOS tube Q12 and improve EMI.

[0025] Furthermore, the MOS transistor Q12 is an N-type MOS transistor, and the MOS transistor Q19 is a P-type MOS transistor.

[0026] From the above description, it can be known that the MOS tube Q12 is an N-type MOS tube, and the MOS tube Q19 is a P-type MOS tube, which can realize the switching of the power supply of the first power supply control end and the power supply of the second power supply control end.

[0027] Please refer to Figure 1 , Embodiment 1 of the present utility model is:

[0028] A photovoltaic inverter relay power switching circuit comprises a MOS tube Q12 (model 2N7002), a MOS tube Q19 (model YJM05GP06A), a diode D40 (model SS24) and a diode D43 (model SS24), wherein the gate of the MOS tube Q12 is electrically connected to a power control signal terminal of an external controller, the source of the MOS tube Q12 is electrically connected to the gate of the MOS tube Q19, the drain of the MOS tube Q12 is grounded, the gate of the MOS tube Q19 is electrically connected to the source of the MOS tube Q19, and the end after the gate of the MOS tube Q19 is connected to the source of the MOS tube Q19 is electrically connected to a first power supply control terminal of a relay power supply, the source of the MOS tube Q19 is electrically connected to the cathode of the diode D40 and the cathode of the diode D43 respectively, the anode of the diode D40 is electrically connected to the anode of the diode D43, and the end after the anode of the diode D40 is connected to the anode of the diode D43 is electrically connected to a second power supply control terminal of the relay power supply.

[0029] It also includes a resistor R236 (resistance value is 47kΩ) and a resistor R235 (resistance value is 100Ω), one end of the resistor R236 is electrically connected to the source of the MOS tube Q19 and the first power supply control end of the relay power supply, respectively, the other end of the resistor R236 is electrically connected to the gate of the MOS tube Q19 and one end of the resistor R235, respectively, and the other end of the resistor R235 is electrically connected to the drain of the MOS tube Q12.

[0030] It also includes a resistor R233 (resistance value is 499Ω) and a resistor R234 (resistance value is 10kΩ), one end of the resistor R234 is electrically connected to the power control signal end of the external controller, the other end of the resistor R234 is electrically connected to one end of the resistor R234 and the gate of the MOS tube Q12 respectively, the other end of the resistor R234 is electrically connected to the source of the MOS tube Q12 and the other end of the resistor R234 is grounded.

[0031] It also includes a capacitor C111 (with a capacitance of 0.1 μF), one end of which is electrically connected to the other end of the resistor R233, one end of the resistor R234 and the gate of the MOS tube Q12, and the other end of the capacitor C111 is electrically connected to the other end of the resistor R234 and the source of the MOS tube Q12, and the other end of the capacitor C111 is grounded.

[0032] The MOS transistor Q12 is an N-type MOS transistor, and the MOS transistor Q19 is a P-type MOS transistor.

[0033] The working principle of the above photovoltaic inverter relay power switching circuit is:

[0034] The power control signal terminal of the controller gives a high level signal to the RLY_ESPN terminal, making the V GS is greater than its turn-on threshold voltage, MOS tube Q12 is turned on, and the gate of MOS tube Q19 is pulled down to GND, making V GS When the voltage is greater than the turn-on threshold voltage, the MOS tube Q19 is turned on, and the relay power supply is powered by the power supply (+12V) of the first power supply terminal of the relay power supply through the MOS tube Q19;

[0035] When the relay is successfully closed and the power supply (+6V) of the second power supply terminal of the relay power supply is needed as the relay power supply, the power control signal terminal of the controller gives a low level signal to the RLY_ESPN terminal, so that the V GS is less than its turn-on threshold voltage, MOS tube Q12 is disconnected, and the gate of MOS tube Q19 is in high impedance state, making V GSWhen the voltage of the relay is lower than the turn-on threshold voltage, the MOS tube Q19 is disconnected. At this time, the relay power supply is powered by the power supply (+6V) of the second power supply terminal through the diode D40 and the diode D43. In this way, the power supply voltage of the relay can be adjusted as needed through the external circuit, which reduces the power loss during the operation of the relay and reduces the temperature of the relay, thereby extending the service life of the relay and improving the overall efficiency of the photovoltaic inverter. Due to the presence of the diode D40 and the diode D43, when the relay power supply is turned on, the conduction power consumption is reduced to 1 / 4 of the original, the relay power loss is significantly reduced, and the service life of the device and the overall life of the photovoltaic inverter are greatly enhanced.

[0036] In summary, the utility model provides a photovoltaic inverter relay power switching circuit, by setting MOS tube Q12, MOS tube Q19, diode D40 and diode D43, the power control signal end of the controller gives a high level signal to the gate of MOS tube Q12, so that the V GS is greater than its turn-on threshold voltage, MOS tube Q12 is turned on, and the gate of MOS tube Q19 is pulled down to ground, making V GS When the voltage of the MOS tube Q12 is greater than the opening threshold voltage, the MOS tube Q19 is turned on, and the relay power supply is powered by the power supply of the first power supply end of the relay power supply through the MOS tube Q19; when the relay is successfully attracted and the power supply of the second power supply end of the relay power supply is needed as the relay power supply, the power control signal end of the controller gives a low level signal to the gate of the MOS tube Q12, so that the V GS is less than its turn-on threshold voltage, MOS tube Q12 is disconnected, and the gate of MOS tube Q19 is in high impedance state, making V GS When the voltage of the relay is lower than the turn-on threshold voltage, the MOS tube Q19 is disconnected. At this time, the relay power supply is supplied by the power supply of the second power supply terminal through the diode D40 and the diode D43. In this way, the power supply voltage of the relay can be adjusted as needed through the external circuit, thereby reducing the power loss during the operation of the relay and reducing the temperature of the relay, thereby extending the service life of the relay and improving the overall efficiency of the photovoltaic inverter. Due to the presence of the diode D40 and the diode D43, when the relay power supply is turned on, the conduction power consumption is reduced to 1 / 4 of the original, the relay power loss is significantly reduced, and the service life of the device and the overall life of the photovoltaic inverter are greatly enhanced.

[0037] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent transformations made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical field, are also included in the patent protection scope of the present invention.

Claims

1. A photovoltaic inverter relay power switching circuit, characterized in that: The invention comprises a MOS transistor Q12, a MOS transistor Q19, a diode D40 and a diode D43, wherein the gate of the MOS transistor Q12 is electrically connected to the power control signal terminal of the controller of the external device, the source of the MOS transistor Q12 is electrically connected to the gate of the MOS transistor Q19, the drain of the MOS transistor Q12 is grounded, the gate of the MOS transistor Q19 is electrically connected to the source of the MOS transistor Q19, and one end after the gate of the MOS transistor Q19 is connected to the source of the MOS transistor Q19 is electrically connected to the first power supply control terminal of the relay power supply, the source of the MOS transistor Q19 is electrically connected to the cathode of the diode D40 and the cathode of the diode D43 respectively, the anode of the diode D40 is electrically connected to the anode of the diode D43, and one end after the anode of the diode D40 is connected to the anode of the diode D43 is electrically connected to the second power supply control terminal of the relay power supply.

2. The photovoltaic inverter relay power switching circuit according to claim 1, characterized in that: It also includes a resistor R236 and a resistor R235, one end of the resistor R236 is electrically connected to the source of the MOS tube Q19 and the first power supply control end of the relay power supply, the other end of the resistor R236 is electrically connected to the gate of the MOS tube Q19 and one end of the resistor R235, and the other end of the resistor R235 is electrically connected to the drain of the MOS tube Q12.

3. The photovoltaic inverter relay power switching circuit according to claim 1, characterized in that: It also includes a resistor R233 and a resistor R234, one end of the resistor R234 is electrically connected to the power control signal end of the external controller, the other end of the resistor R234 is electrically connected to one end of the resistor R234 and the gate of the MOS tube Q12 respectively, the other end of the resistor R234 is electrically connected to the source of the MOS tube Q12 and the other end of the resistor R234 is grounded.

4. The photovoltaic inverter relay power switching circuit according to claim 3, characterized in that: It also includes a capacitor C111, one end of which is electrically connected to the other end of the resistor R233, one end of the resistor R234 and the gate of the MOS tube Q12, and the other end of the capacitor C111 is electrically connected to the other end of the resistor R234 and the source of the MOS tube Q12, and the other end of the capacitor C111 is grounded.

5. The photovoltaic inverter relay power switching circuit according to claim 1, characterized in that: The MOS transistor Q12 is an N-type MOS transistor, and the MOS transistor Q19 is a P-type MOS transistor.

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