Novel switching power supply relay pull-in delay power supply circuit

Abstract

The utility model relates to the technical field of relay circuits, in particular to a novel switching power supply relay pull-in delay power supply circuit, which comprises an alternating current input EMI circuit, a rectification filter circuit, an LLC circuit and a VCC delay control circuit, and the VCC delay control circuit comprises a thermistor RT1 and an alternating current relay RY1. The alternating current input EMI circuit is respectively connected with the thermistor RT1 and the alternating current relay RY1, the rectification filter circuit is respectively connected with the thermistor RT1 and the alternating current relay RY1, the rectification filter circuit is connected with the LLC circuit, and the LLC circuit is connected with the VCC delay control circuit. Compared with the prior art, the novel switching power supply relay pull-in time-delay power supply circuit acts on switching power supply input alternating current relay control and supplies power to LLC in a time-delay mode, contact sparking during relay pull-in can be effectively prevented, and the safety performance of a power supply is improved.

Description

[Technical field]

[0001] The utility model relates to the technical field of relay circuits, in particular to a novel switch power supply relay pull-in delay power supply circuit. [Background technology]

[0002] The AC relay control circuit of the prior art will have sparking at the contacts when it is energized, which poses a safety hazard, shortens the service life of the power supply, and causes power waste. [Contents of the utility model]

[0003] In order to overcome the above problems, the utility model proposes a novel switch power supply relay closing delay power supply circuit which can effectively solve the above problems.

[0004] The utility model provides a technical solution to solve the above technical problems: providing a new switching power supply relay pull-in delay power supply circuit, including an AC input EMI circuit, a rectifier filter circuit, an LLC circuit and a VCC delay control circuit; the VCC delay control circuit includes a thermistor RT1 and an AC relay RY1, the AC input EMI circuit is respectively connected to the thermistor RT1 and the AC relay RY1, the rectifier filter circuit is respectively connected to the thermistor RT1 and the AC relay RY1, the rectifier filter circuit is connected to the LLC circuit, and the LLC circuit is connected to the VCC delay control circuit.

[0005] Preferably, the AC input EMI circuit is connected to pin 1 of the thermistor RT1, the AC input EMI circuit is connected to pin 4 of the AC relay RY1, and pin 2 of the thermistor RT1, pin 3 of the AC relay RY1 and the rectifier and filter circuit are connected together.

[0006] Preferably, the VCC delay control circuit comprises a switching transistor Q2, and the switching transistor Q2 is connected to the LLC circuit.

[0007] Preferably, the VCC delay control circuit includes a protection diode D1 and a current limiting resistor R4, and pin 1 of the AC relay RY1, the K pole of the protection diode D1, the E pole of the switching transistor Q2, and pin 1 of the current limiting resistor R4 are respectively connected to the VCC power supply.

[0008] Preferably, the VCC delay control circuit includes a switching transistor Q3, pin 2 of the AC relay RY1, pole A of the protection diode D1, and pole C of the switching transistor Q3 are connected together, and pole B of the switching transistor Q3 is connected to pin 2 of the current limiting resistor R4.

[0009] Preferably, the VCC delay control circuit comprises a current limiting resistor R2 and a sampling resistor R3, and the E pole of the switching transistor Q3, the pin 1 of the current limiting resistor R2, and the pin 1 of the sampling resistor R3 are connected together.

[0010] Preferably, the VCC delay control circuit comprises a delay capacitor C1 and a switching transistor Q1, and pin 2 of the current limiting resistor R2, pin 1 of the delay capacitor C1, and pole B of the switching transistor Q1 are connected together.

[0011] Preferably, the VCC delay control circuit includes a current limiting resistor R1, wherein pin 2 of the current limiting resistor R1 and the C pole of the switching transistor Q1 are connected together, and pin 1 of the current limiting resistor R1 and the B pole of the switching transistor Q2 are connected together.

[0012] Preferably, the C pole of the switching transistor Q1 is connected to LLC power supply, and the 2nd foot of the sampling resistor R3, the 2nd foot of the delay capacitor C1, the E pole of the switching transistor Q1 and GND are connected together.

[0013] Preferably, the AC input EMI circuit is connected to the neutral line.

[0014] Compared with the prior art, the novel switching power supply relay closing delay power supply circuit of the utility model acts on the switching power supply input AC relay control, and by delaying the power supply to the LLC, it can effectively prevent the contacts from sparking when the relay is closed, thereby improving the safety performance of the power supply.

Brief Description of the Drawings

[0015] Figure 1 This is a structural diagram of the new switching power supply relay pull-in delay power supply circuit of the utility model. [Specific implementation method]

[0016] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below with reference to the accompanying drawings and implementation examples. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0017] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are limited to relative positions on the specified view rather than absolute positions.

[0018] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0019] See also Figure 1 The utility model discloses a novel switch power supply relay closing delay power supply circuit, which comprises an AC input EMI circuit, a rectifier filter circuit, an LLC circuit and a VCC delay control circuit.

[0020] The VCC delay control circuit includes a thermistor RT1 and an AC relay RY1, the AC input EMI circuit is connected to the thermistor RT1 and the AC relay RY1 respectively, the rectifier and filter circuit is connected to the thermistor RT1 and the AC relay RY1 respectively, the rectifier and filter circuit is connected to the LLC circuit, and the LLC circuit is connected to the VCC delay control circuit.

[0021] The AC input EMI circuit is connected to the neutral line.

[0022] The AC input EMI circuit is connected to pin 1 of the thermistor RT1, the AC input EMI circuit is connected to pin 4 of the AC relay RY1, and pin 2 of the thermistor RT1, pin 3 of the AC relay RY1 and the rectifier and filter circuit are connected together.

[0023] The VCC delay control circuit includes a switch transistor Q2, and the switch transistor Q2 is connected to the LLC circuit.

[0024] The VCC delay control circuit includes a protection diode D1 and a current limiting resistor R4. Pin 1 of the AC relay RY1, the K pole of the protection diode D1, the E pole of the switch transistor Q2, and pin 1 of the current limiting resistor R4 are respectively connected to the VCC power supply.

[0025] The VCC delay control circuit includes a switch transistor Q3, pin 2 of the AC relay RY1, pole A of the protection diode D1, and pole C of the switch transistor Q3 are connected together, and pole B of the switch transistor Q3 is connected to pin 2 of the current limiting resistor R4.

[0026] The VCC delay control circuit includes a current limiting resistor R2 and a sampling resistor R3. The E pole of the switch transistor Q3, the pin 1 of the current limiting resistor R2, and the pin 1 of the sampling resistor R3 are connected together.

[0027] The VCC delay control circuit includes a delay capacitor C1 and a switch transistor Q1. Pin 2 of the current limiting resistor R2, pin 1 of the delay capacitor C1, and the B pole of the switch transistor Q1 are connected together.

[0028] The VCC delay control circuit includes a current limiting resistor R1, wherein the pin 2 of the current limiting resistor R1 and the C pole of the switching transistor Q1 are connected together, and the pin 1 of the current limiting resistor R1 and the B pole of the switching transistor Q2 are connected together.

[0029] The C pole of the switching transistor Q1 is connected to the LLC power supply, and the 2nd foot of the sampling resistor R3, the 2nd foot of the delay capacitor C1, the E pole of the switching transistor Q1 and GND are connected together.

[0030] Working principle: When the AC auxiliary power source is turned on: VCC is added to the C pole of the switching transistor Q3 through the AC relay RY1, and at the same time VCC is added to the current limiting resistor R4 and the BE pole of the switching transistor Q3. The switching transistor Q3 is saturated and turned on, and current flows through the sampling resistor R3 to form a voltage.

[0031] The voltage on the sampling resistor R3 charges the delay capacitor C1 through the current limiting resistor R2. When the voltage of the delay capacitor C1 is charged to 0.7V, the switching transistor Q1 is turned on. A small current from VCC passes through the BE pole of the switching transistor Q2, the current limiting resistor R1, and the CE pole of the switching transistor Q1. The B pole voltage of the switching transistor Q2 is 0.7V lower than the E pole voltage. The switching transistor Q2 is turned on, and LLC is powered and starts working.

[0032] Compared with the prior art, the novel switching power supply relay closing delay power supply circuit of the utility model acts on the switching power supply input AC relay control, and by delaying the power supply to the LLC, it can effectively prevent the contacts from sparking when the relay is closed, thereby improving the safety performance of the power supply.

[0033] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any modifications, equivalent substitutions and improvements made within the concept of the present invention should be included in the patent protection scope of the present invention.

Claims

1. A new type of switching power supply relay pull-in delay power supply circuit, characterized in that: Including AC input EMI circuit, rectifier filter circuit, LLC circuit and VCC delay control circuit; The VCC delay control circuit includes a thermistor RT1 and an AC relay RY1, the AC input EMI circuit is connected to the thermistor RT1 and the AC relay RY1 respectively, the rectifier and filter circuit is connected to the thermistor RT1 and the AC relay RY1 respectively, the rectifier and filter circuit is connected to the LLC circuit, and the LLC circuit is connected to the VCC delay control circuit.

2. The novel switching power supply relay pick-up delay power supply circuit as claimed in claim 1 is characterized in that: The AC input EMI circuit is connected to pin 1 of the thermistor RT1, the AC input EMI circuit is connected to pin 4 of the AC relay RY1, and pin 2 of the thermistor RT1, pin 3 of the AC relay RY1 and the rectifier and filter circuit are connected together.

3. The novel switch power supply relay pull-in delay power supply circuit as claimed in claim 1 is characterized in that: The VCC delay control circuit includes a switch transistor Q2, and the switch transistor Q2 is connected to the LLC circuit.

4. The novel switch power supply relay pull-in delay power supply circuit as claimed in claim 3 is characterized in that: The VCC delay control circuit includes a protection diode D1 and a current limiting resistor R4. Pin 1 of the AC relay RY1, the K pole of the protection diode D1, the E pole of the switch transistor Q2, and pin 1 of the current limiting resistor R4 are respectively connected to the VCC power supply.

5. The novel switch power supply relay pick-up delay power supply circuit as claimed in claim 4 is characterized in that: The VCC delay control circuit includes a switch transistor Q3, pin 2 of the AC relay RY1, pole A of the protection diode D1, and pole C of the switch transistor Q3 are connected together, and pole B of the switch transistor Q3 is connected to pin 2 of the current limiting resistor R4.

6. The novel switch power supply relay pull-in delay power supply circuit as claimed in claim 5 is characterized in that: The VCC delay control circuit includes a current limiting resistor R2 and a sampling resistor R3. The E pole of the switch transistor Q3, the pin 1 of the current limiting resistor R2, and the pin 1 of the sampling resistor R3 are connected together.

7. The novel switch power supply relay pick-up delay power supply circuit as claimed in claim 6 is characterized in that: The VCC delay control circuit includes a delay capacitor C1 and a switch transistor Q1. Pin 2 of the current limiting resistor R2, pin 1 of the delay capacitor C1, and the B pole of the switch transistor Q1 are connected together.

8. The novel switch power supply relay closing delay power supply circuit as claimed in claim 7 is characterized in that: The VCC delay control circuit includes a current limiting resistor R1, wherein the pin 2 of the current limiting resistor R1 and the C pole of the switching transistor Q1 are connected together, and the pin 1 of the current limiting resistor R1 and the B pole of the switching transistor Q2 are connected together.

9. The novel switch power supply relay closing delay power supply circuit as claimed in claim 7 is characterized in that: The C pole of the switching transistor Q1 is connected to the LLC power supply, and the 2nd foot of the sampling resistor R3, the 2nd foot of the delay capacitor C1, the E pole of the switching transistor Q1 and GND are connected together.

10. The novel switch power supply relay closing delay power supply circuit as claimed in claim 1, characterized in that: The AC input EMI circuit is connected to the neutral line.

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