Improved anti-reverse connection protection circuit
By using an anti-reverse circuit in parallel with diodes and relays in the solar controller, the power loss and oscillation problems are solved, and the safety and efficiency of the equipment are improved.
Patent Information
- Application Number
- CN202421035638.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-14
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-05-14
AI Technical Summary
The anti-reverse circuit of existing solar controllers has problems such as large power loss, relay oscillation and high volume cost, especially under different power output conditions.
The anti-reverse circuit is formed in parallel with diodes and relays, and automatically switches according to the output power of the solar panel to avoid frequent operation of the relay at low power and high power consumption of the diode at high power.
It effectively reduces relay oscillation and power consumption, reduces product volume and cost, and improves the safety and efficiency of solar controllers.
Smart Images
Figure CN222262172U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to a voltage reverse connection protection technology, and in particular to an improved reverse connection protection circuit for a solar controller input voltage. Background Art
[0002] The solar controller is an indispensable device for the solar power generation system. Its reliability and stability directly affect the reliability and stability of the solar power generation system. Among them, the reliability and stability of the solar controller's anti-reverse connection function is one of the important factors affecting its reliability and stability.
[0003] There are three main methods of reverse connection prevention used in solar controllers. The first is to connect a diode in series in the input to prevent reverse connection, the second is to use a relay to prevent reverse connection, and the third is to use a MOS tube to prevent reverse connection. These three methods have their shortcomings. The main problem of the first method of using a diode to prevent reverse connection is large power loss, because the diode has a tube voltage drop, and the power consumption is relatively large when working at a large current. The second problem of using a relay to prevent reverse connection is that when the output power of the solar panel is relatively small, the relay will oscillate, which will not only generate noise, but also easily cause damage to the relay contacts. The third method of using a MOS tube to prevent reverse connection mainly has the problem that the MOS tube needs to be installed on the radiator, which is relatively large in size and high in cost. In view of the problems existing in the above anti-reverse connection circuit, we have improved the anti-reverse connection circuit. Utility Model Content
[0004] In order to solve one of the above-mentioned technical defects, an improved anti-reverse connection protection circuit is provided in the embodiment of the present application, which can well solve the above-mentioned problem. The circuit adopts a diode and a relay in parallel to form an anti-reverse connection circuit, which can well solve the above-mentioned problem. Since the circuit adopts a diode and a relay in parallel to form an anti-reverse connection circuit, when the output power of the solar panel is relatively small, the relay will not be energized to work. At this time, the diode works, avoiding the situation of relay oscillation (frequent energization and disconnection). Since the current is not large at this time, the power consumption of the diode is not large. When the output power of the solar panel is relatively large, the relay will be energized to work. At this time, since the diode is short-circuited by the contacts of the relay, the current will flow through the relay instead of the diode, so the circuit does not generate power consumption at this time, which perfectly solves the above-mentioned problem, so that the solar controller can work more safely and efficiently.
[0005] According to a first aspect of an embodiment of the present application, an improved anti-reverse connection protection circuit is provided, comprising: a switch tube Q1, a switch tube Q2 and a relay RY1, wherein the switch tube Q1 and the switch tube Q2 are connected in series to form a half-bridge circuit, the midpoint of the bridge arm of the half-bridge circuit is connected to an inductor L1, the PW1 end of the switch tube Q1 is a drive pulse input end of the switch tube Q1, the PW2 end of the switch tube Q2 is a drive pulse input end of the switch tube Q2, and the contact of the relay RY1 is connected between the positive terminal PV+ of the solar panel and the drain of the switch tube Q1.
[0006] Furthermore, a diode D1A is connected in parallel to the contact of the relay RY1.
[0007] Furthermore, a transistor Q3 is included, and a base of the transistor Q3 is connected to the input control signal K1 through a resistor R6.
[0008] Furthermore, the collector of the transistor Q3 at the 4th pin of the relay RY1 and the 5th pin of the relay RY1 are connected to the positive terminal of the 12V power supply.
[0009] The above-mentioned problem can be solved well by adopting an improved anti-reverse connection protection circuit provided in the embodiment of the present application. The circuit adopts a diode and a relay in parallel to form an anti-reverse connection circuit, which can solve the above-mentioned problem well. Since the circuit adopts a diode and a relay in parallel to form an anti-reverse connection circuit, when the output power of the solar panel is relatively small, the relay does not work by absorbing. At this time, the diode works, avoiding the situation that the relay oscillates (frequently absorbing and disconnecting). Since the current is not large at this time, the power consumption of the diode is not large. When the output power of the solar panel is relatively large, the relay will absorb and work. At this time, since the diode is short-circuited by the contacts of the relay, the current will flow through the relay instead of the diode, so the circuit does not generate power consumption at this time. The problem that the power consumption is relatively large when working with a large current, the relay will oscillate, and the problem that noise will be generated at the same time is solved, the problem that the relay contacts are easily damaged is reduced, the volume of the product is reduced, and the cost is saved, so that the solar controller can work more safely and efficiently. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:
[0011] Figure 1 A schematic diagram of the structure of an improved anti-reverse connection protection circuit provided in an embodiment of the present application. DETAILED DESCRIPTION
[0012] In order to make the technical solutions and advantages in the embodiments of the present application more clearly understood, the exemplary embodiments of the present application are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than an exhaustive list of all the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.
[0013] The utility model discloses an improved anti-reverse connection protection circuit, which performs anti-reverse connection protection on the input voltage of a solar controller. Figure 1 As shown, the improved anti-reverse connection protection circuit includes switch tubes Q1 and Q2, diode D1A, relay RY1, transistor Q3, resistor R6, and inductor L1, wherein the switch tubes Q1 and Q2 are connected in series to form a half-bridge circuit, the inductor L1 is connected to the midpoint of the bridge arm, the contact of the relay and the diode D1A are connected in parallel and then connected between PV+ and the D pole of Q1, the 5th pin of the relay coil is connected to the positive terminal of the 12V power supply, the 4th pin of the coil is connected to the C pole of the transistor Q3, and at the same time, the E pole of the transistor Q3 is grounded, and the B pole is connected to the control signal K1 through the resistor R6.
[0014] Figure 1 The following is a schematic diagram of an improved anti-reverse connection protection circuit of the utility model. Figure 1 As shown, in this embodiment, the improved anti-reverse connection protection circuit is used to protect the input voltage of the solar controller from reverse connection. During the implementation process, Figure 1 The "PV+" terminal in the circuit is connected to the positive terminal of the solar panel. Figure 1 The "PV-" terminal is connected to the negative terminal of the solar panel, the "BAT+" terminal is connected to the positive terminal of the battery, the ground is connected to the negative terminal of the battery, "K1" is connected to the relay control signal of the microprocessor, and the "PW1" and "PW2" terminals are connected to the driving pulse of the switch tube. When the solar controller is working, when the output power of the solar panel is lower than a certain threshold, the relay control signal K1 is low, and the relay RY1 will not be energized to work. At this time, only the diode D1A is working, thus avoiding the problem of frequent operation of the relay at low power, because the current is relatively small at this time, so the power consumption on the diode is not large. When the output power of the solar panel is higher than a certain threshold, the relay control signal K1 is high, and the relay RY1 will be energized to work. At this time, the contacts of the relay RY1 short-circuit the diode D1A, so the input current will flow through the relay instead of the diode, so the circuit does not generate power consumption at this time. Therefore, when the input power is small, the diode works to avoid the problem of relay oscillation, and when the input power is large, the relay works to avoid the problem of high power consumption of the diode at high current, so that the two complement each other's advantages, so that the solar controller can work more safely and efficiently.
[0015] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.
[0016] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.
Claims
1. An improved anti-reverse connection protection circuit, characterized in that: include: The switch tube Q1, the switch tube Q2 and the relay RY1 are connected in series to form a half-bridge circuit, the midpoint of the bridge arm of the half-bridge circuit is connected with an inductor L1, the PW1 end of the switch tube Q1 is the driving pulse input end of the switch tube Q1, the PW2 end of the switch tube Q2 is the driving pulse input end of the switch tube Q2, and the contact of the relay RY1 is connected between the positive terminal PV+ of the solar cell panel and the drain of the switch tube Q1.
2. The improved anti-reverse connection protection circuit according to claim 1, characterized in that: A diode D1A is connected in parallel to the contact of the relay RY1.
3. The improved anti-reverse connection protection circuit according to claim 1 is characterized in that: It also includes a transistor Q3, a base of which is connected to an input control signal K1 via a resistor R6.
4. The improved anti-reverse connection protection circuit according to claim 1, characterized in that: The 4th pin of the relay RY1 is the collector of the transistor Q3, and the 5th pin of the relay RY1 is connected to the positive terminal of the 12V power supply.