A high-efficiency fast-response switch relay control circuit
By employing a fast-response switching relay control circuit in a high-power power supply, and using capacitors and switching transistors to control the on/off state of the relay, the problems of high power consumption and temperature rise caused by long-term operation of thermistors are solved, thus achieving efficient operation of the power supply.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DONGGUAN BEIDOUXING ELECTRONIC TECH CO LTD
- Filing Date
- 2025-06-04
- Publication Date
- 2026-05-29
Smart Images
Figure CN224304617U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power supply circuit technology, specifically to a high-efficiency, fast-response switching relay control circuit. Background Technology
[0002] High-power power supplies (especially switching power supplies) generate inrush currents during startup or when a sudden input voltage is applied. These inrush currents can damage external instruments and equipment. To prevent excessive inrush currents in existing high-power power supplies, a thermistor is typically connected in series in the circuit for control. However, thermistors that operate for extended periods consume a significant amount of power, which can affect the overall temperature rise and reduce efficiency. Utility Model Content
[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a high-efficiency fast-response switching relay control circuit to solve the problem that the thermistor in the existing high power supply has a large power consumption during long-term operation, which will affect the overall temperature rise and the efficiency is low.
[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0005] This application provides a high-efficiency, fast-response switch relay control circuit, including a capacitor C1, a thermistor RT1, a relay K1, and a switching transistor control circuit. The relay K1 is connected in parallel across the thermistor RT1. The capacitor C1 is electrically connected to the switching transistor control circuit, which provides voltage to the switching transistor control circuit. The switching transistor control circuit is electrically connected to the relay K1. When the voltage within the capacitor C1 gradually increases, the switching transistor control circuit controls the relay K1 to conduct, and the thermistor RT1 is short-circuited. When the voltage within the capacitor C1 gradually decreases, the switching transistor control circuit controls the relay K1 to disconnect, and the thermistor RT1 operates normally.
[0006] Furthermore, the switching control circuit includes transistors Q16, Q17, and Q15. The gate of transistor Q16 is connected to capacitor C1, the source of transistor Q16 is connected to the source of transistor Q17, the drain of transistor Q16 is connected to the drain of transistor Q15, the source of transistor Q15 is connected to one end of relay K1, the gate of transistor Q15 is connected to the drain of transistor Q17, and the source of transistor Q17 is connected to the other end of relay K1.
[0007] Furthermore, the capacitor C1 is connected to the gate of the transistor Q16 through resistors R67, R65 and R56 connected in series.
[0008] Furthermore, the other end of the relay K1 is connected to the gate of the transistor Q15 via a series diode ZD16.
[0009] Furthermore, a capacitor C57 is connected in parallel between the gate and source of the transistor Q16.
[0010] The beneficial effects of this utility model are as follows:
[0011] By adopting the above-mentioned high-efficiency fast-response switch relay control circuit, the thermistor is controlled to suppress the current in the circuit when the product is first started. After the product starts normally, the relay short-circuites the thermistor. After the product is powered off, the relay is accurately disconnected to ensure that the thermistor can suppress the current when the product is first started each time. After stable operation, the thermistor is short-circuited to reduce heat loss and improve efficiency. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the circuit principle of the high-efficiency fast-response switch relay control circuit in the embodiments of this application. Detailed Implementation
[0013] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.
[0014] See appendix Figure 1 As shown, this embodiment provides a high-efficiency fast-response switch relay control circuit, including capacitor C1, thermistor RT1, relay K1, and switch control circuit.
[0015] In this embodiment, relay K1 is connected in parallel across the thermistor RT1 to control whether the thermistor RT1 is short-circuited. That is, when relay K1 is energized and conducting, the thermistor RT1 is short-circuited, and no current flows through the thermistor RT1. When relay K1 is de-energized, the thermistor RT1 enters the circuit normally, and current flows through the thermistor RT1.
[0016] Capacitor C1 is electrically connected to the switching transistor control circuit. Capacitor C1 is used to provide voltage to the switching transistor control circuit. The switching transistor control circuit is electrically connected to relay K1. When the voltage in capacitor C1 gradually increases, the switching transistor control circuit controls relay K1 to conduct, and the thermistor RT1 is short-circuited. When the voltage in capacitor C1 gradually decreases, the switching transistor control circuit controls relay K1 to open, and the thermistor RT1 operates normally.
[0017] This solution utilizes a thermistor to suppress current in the circuit during initial startup. Once the product starts normally, a relay short-circuites the thermistor. After the product is powered off, the relay is precisely disconnected. This ensures that the thermistor can suppress current each time the product starts up, and after stable operation, the thermistor is short-circuited, reducing heat generation and improving efficiency.
[0018] Continue to refer to the appendix Figure 1 As shown, in this embodiment, the switching control circuit specifically includes transistors Q16, Q17, and Q15. Capacitor C1 is connected to the gate of transistor Q16 through resistors R67, R65, and R56 connected in series. The source of transistor Q16 is connected to the source of transistor Q17, and the drain of transistor Q16 is connected to the drain of transistor Q15. The source of transistor Q15 is connected to one end of relay K1, and the gate of transistor Q15 is connected to the drain of transistor Q17. The source of transistor Q17 is connected to the other end of relay K1, and the other end of relay K1 is connected to the gate of transistor Q15 through a series diode ZD16.
[0019] After the product is powered on and in normal use, the internal high-voltage capacitor C1 provides a bias voltage to transistor Q16, causing it to conduct. Transistor Q17 is de-conducting, while transistor Q15 is conducting. Relay K1 is conducting, and thermistor RT1 is short-circuited, preventing it from working. This avoids excessive power consumption during prolonged operation, which could affect the overall temperature rise. When the product is powered off, the voltage across capacitor C1 drops, transistor Q16 is de-conducting, transistor Q17 is conducting, transistor Q15 is de-conducting, and relay K1 is de-conducting.
[0020] In some embodiments, a capacitor C57 is connected in parallel between the gate and source of transistor Q16 to stabilize the gate voltage of transistor Q16 and improve its anti-interference capability.
[0021] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.
Claims
1. A high-efficiency, fast-response switching relay control circuit, characterized in that, The device includes a capacitor C1, a thermistor RT1, a relay K1, and a switching transistor control circuit. The relay K1 is connected in parallel across the thermistor RT1. The capacitor C1 is electrically connected to the switching transistor control circuit, which provides voltage to the circuit. The switching transistor control circuit is also electrically connected to the relay K1. When the voltage within the capacitor C1 gradually increases, the switching transistor control circuit turns on the relay K1, short-circuiting the thermistor RT1. When the voltage within the capacitor C1 gradually decreases, the switching transistor control circuit turns off the relay K1, allowing the thermistor RT1 to operate normally.
2. The high-efficiency, fast-response switching relay control circuit according to claim 1, characterized in that, The switching control circuit includes transistors Q16, Q17, and Q15. The gate of transistor Q16 is connected to capacitor C1, the source of transistor Q16 is connected to the source of transistor Q17, the drain of transistor Q16 is connected to the drain of transistor Q15, the source of transistor Q15 is connected to one end of relay K1, the gate of transistor Q15 is connected to the drain of transistor Q17, and the source of transistor Q17 is connected to the other end of relay K1.
3. The high-efficiency, fast-response switching relay control circuit according to claim 2, characterized in that, The capacitor C1 is connected to the gate of the transistor Q16 through resistors R67, R65 and R56 connected in series.
4. A high-efficiency, fast-response switching relay control circuit according to claim 2 or 3, characterized in that, The other end of the relay K1 is connected to the gate of the transistor Q15 via a series diode ZD16.
5. A high-efficiency, fast-response switching relay control circuit according to claim 2 or 3, characterized in that, A capacitor C57 is also connected in parallel between the gate and source of the transistor Q16.