Pin puller control circuit

Abstract

The utility model discloses a pin puller control circuit, which comprises an RC charging circuit, an MOS tube conduction circuit and a voltage stabilizing circuit, and is characterized in that the RC charging circuit comprises divider resistors R1 and R2, a dissipation resistor R4 and a capacitor C1; the other end of the resistor R1 is connected with an RC + charging output end; the MOS tube conduction circuit comprises a resistor R3, an MOS tube Q1 and a pin puller coil L1, one end of the resistor R3 is connected with the RC + charging output end, the other end of the resistor R3 is connected with a G pole of the MOS tube Q1, a D pole of the MOS tube Q1 is connected with one end of the pin puller coil L1, and the other end of the pin puller coil L1 is grounded. After the pin is pulled in place, the current is small during the holding period, the pull-in state can be kept, the coil is prevented from being excessively heated, the problem of long-time holding is solved, and the energy consumption of the battery is also reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of pin puller control, specifically a pin puller control circuit. Background Technology

[0002] Electromagnetic pin pullers have a wide range of applications, including aerospace and industrial control. Traditional electromagnetic pin pullers face two major technical challenges: generating a large pulling force while maintaining the engaged state for an extended period. To generate a large pulling force, a large coil current is required, typically exceeding 2A. This high current causes the coil to heat up rapidly, potentially burning the insulation layer of the enameled wire and causing damage, making it impossible to maintain the engaged state for an extended period. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a pin puller control circuit.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0005] This utility model discloses a pin puller control circuit, including an RC charging circuit, a MOSFET conduction circuit, and a voltage regulator circuit.

[0006] The RC charging circuit includes voltage divider resistors R1 and R2, a dissipation resistor R4, and a capacitor C1.

[0007] One end of resistor R1 is connected to the 30V voltage input terminal and also to J1. The other end of resistor R1 is connected to one end of resistor R2. The other end of resistor R2 is connected to one end of capacitor C1 and one end of dissipation resistor R4. The other ends of capacitor C1 and dissipation resistor R4 are both grounded. The other end of resistor R1 is connected to the RC+ charging output terminal.

[0008] The MOS transistor conduction circuit includes a resistor R3, a MOS transistor Q1, and a pin puller coil L1. One end of the resistor R3 is connected to the RC+ charging output terminal, and the other end of the resistor R3 is connected to the gate (G) of the MOS transistor Q1. The drain (D) of the MOS transistor Q1 is connected to one end of the pin puller coil L1, and the other end of the pin puller coil L1 is grounded.

[0009] The voltage regulator circuit is connected to the MOSFET conduction circuit and regulates the voltage of the MOSFET conduction circuit.

[0010] As a preferred technical solution of this utility model, the voltage regulator circuit includes a voltage regulator U1, a capacitor C2 and a power resistor R5;

[0011] The VIN pin of the voltage regulator U1 is connected to the source (S) terminal of the MOSFET Q1 and is connected to a 30V input voltage. One end of the capacitor C2 and one end of the resistor R5 are connected to the Vout pin of the voltage regulator U1, and the other end of the resistor R5 is connected to the drain (D) terminal of the MOSFET Q1 and one end of the puller coil L1.

[0012] As a preferred embodiment of this utility model, the MOS transistor Q1 is a P-channel MOS transistor, and its model number is CEA6861.

[0013] As a preferred embodiment of this utility model, the voltage regulator U1 is an LDO linear voltage regulator, and its model number is PJ78M05SQ.

[0014] As a preferred embodiment of this utility model, the power resistor R5 is a high-power resistor with a power of 1W.

[0015] The beneficial effects of this utility model are:

[0016] When the control circuit of this type of pin puller is powered on, it generates a large pin pulling force. After the pin is pulled into place, the current is small during the holding period. This can maintain the energized state without causing the coil to overheat, thus solving the problem of holding for a long time and reducing the energy consumption of the battery. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0018] Figure 1 This is a circuit diagram of a pin puller control circuit according to this utility model.

[0019] In the diagram: 1. RC charging circuit; 2. MOSFET conduction circuit; 3. Voltage regulator circuit. Detailed Implementation

[0020] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0021] Example: Figure 1 As shown, the present invention provides a pin puller control circuit, which includes an RC charging circuit 1, a MOS transistor conduction circuit 2, and a voltage regulator circuit 3.

[0022] The RC charging circuit 1 includes voltage divider resistors R1 and R2, a dissipation resistor R4, and a capacitor C1;

[0023] One end of resistor R1 is connected to the 30V voltage input terminal and also to J1. The other end of resistor R1 is connected to one end of resistor R2. The other end of resistor R2 is connected to one end of capacitor C1 and one end of dissipation resistor R4. The other ends of capacitor C1 and dissipation resistor R4 are both grounded. The other end of resistor R1 is connected to the RC+ charging output terminal. Because the MOSFET V... GS The range is ±20V, therefore the gate voltage V needs to be adjusted. G A voltage divider is used, with resistors R1 and R2. Q1 is a P-channel MOSFET, model CEA6861, in an SOT-89 package, with a heatsink, suitable for high-current applications. V DS The maximum voltage is 60V, I D The maximum current is 6.5A. The current draw of the pin puller is no more than 3A, which meets the usage requirements.

[0024] The MOS transistor conduction circuit 2 includes a resistor R3, a MOS transistor Q1, and a pin puller coil L1. One end of the resistor R3 is connected to the RC+ charging output terminal, and the other end of the resistor R3 is connected to the gate (G) terminal of the MOS transistor Q1. The drain (D) terminal of the MOS transistor Q1 is connected to one end of the pin puller coil L1, and the other end of the pin puller coil L1 is grounded.

[0025] The voltage regulator circuit 3 is connected to the MOS transistor conduction circuit 2 and regulates the voltage of the MOS transistor conduction circuit 2.

[0026] The voltage regulator circuit 3 includes a voltage regulator U1, a capacitor C2, and a power resistor R5.

[0027] The VIN pin of the voltage regulator U1 is connected to the source (S) terminal of the MOSFET Q1, and is connected to a 30V input voltage. One end of the capacitor C2 and one end of the resistor R5 are connected to the Vout pin of the voltage regulator U1, and the other end of the resistor R5 is connected to the drain (D) terminal of the MOSFET Q1 and one end of the pull-out coil L1. To stabilize the current i2, a voltage regulator circuit is used. The voltage regulator is a PJ78M05SQ, an LDO linear regulator in an SOT-89 package with a heat sink. The maximum operating voltage is 35V, and the maximum output current is 500mA. R5 is a 1W high-power resistor in a 2512 package. To increase power consumption, two 20Ω / 1W resistors can be connected in parallel. This invention provides a control circuit that generates a large pull-out force when powered on, and maintains a small current during the holding period after the pull-out is in place. This maintains the engaged state without causing excessive coil heating, solving the problem of prolonged holding and reducing battery energy consumption.

[0028] The control circuit board is built into the pin puller. Like traditional pin pullers, it only has two power lines leading out, so it will not affect the user experience. This invention adds a control circuit to the traditional pin puller, which can achieve both rapid pulling and low-power holding, solving the heat generation problem and saving energy consumption.

[0029] Working principle: Upon power-on, capacitor C1 is virtually shorted, the gate (G) of the MOSFET is at a low level, the MOSFET conducts, and current flows through Q1 into the pin puller coil L1. At this time, the current i1 is relatively large, approximately 2A, while the current i2 is negligible, generating a large pulling force to pull the pin out of the coil. 30V charges capacitor C1 through resistors R1 and R2. When the voltage reaches the cutoff voltage of Q1, V... G >D E -1.6V, Q1 is off. Afterwards, the 30V is regulated to 5.0V and then supplies power to the pin puller via R5. At this time, the current flowing through the pin puller is 200mA, which is sufficient to overcome the spring force and keep the pin puller in the engaged state, i.e., the holding state. The coil power consumption is 0.6W at this time, which will not cause excessive heat generation. After the power is turned off, the pin returns to its original state under the action of the spring force.

[0030] like Figure 1 As shown, at the instant power is applied, capacitor C1 is virtually shorted, PMOS transistor Q1 conducts, and the current flowing through coil L1 is... At this point, the pin-pulling force is relatively large, and the pin-pulling action can be completed within 50ms. After C1 is charged to the cutoff voltage of Q1, Q1 is cut off, i1 = 0, R5 and L1 are connected in series, and the current is... The powers of R5 and L1 are respectively P1 = I 2 R = 0.2 2 *10 = 0.4W, P2 = I 2 R = 0.2 2 *15 = 0.6W. Can be maintained for a long time.

[0031] The charging time of the capacitor is calculated according to Formula 1, and the initial voltage of C1 is 0.

[0032]

[0033] E - where V in the above formula t-为 The voltage at any given time, E is the voltage after the capacitor is fully charged.

[0034] According to the formula, adjusting the RC or power supply voltage E parameter can change the conduction time of Q1.

[0035] To ensure reliable pin pulling, the resistance value of R5 can be adjusted according to the resistance and pulling force requirements of different pin puller coils. This is necessary to overcome the spring force to maintain the pin pulling state while ensuring that it does not overheat during long-term energization.

[0036] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A pin-pulling device control circuit, characterized in that: It includes an RC charging circuit (1), a MOSFET conduction circuit (2), and a voltage regulator circuit (3); The RC charging circuit (1) includes voltage divider resistors R1 and R2, dissipation resistor R4 and capacitor C1; One end of resistor R1 is connected to the 30V voltage input terminal and also to J1. The other end of resistor R1 is connected to one end of resistor R2. The other end of resistor R2 is connected to one end of capacitor C1 and one end of dissipation resistor R4. The other ends of capacitor C1 and dissipation resistor R4 are both grounded. The other end of resistor R1 is connected to the RC+ charging output terminal. The MOS transistor conduction circuit (2) includes a resistor R3, a MOS transistor Q1 and a pin puller coil L1. One end of the resistor R3 is connected to the RC+ charging output terminal, and the other end of the resistor R3 is connected to the gate of the MOS transistor Q1. The drain of the MOS transistor Q1 is connected to one end of the pin puller coil L1, and the other end of the pin puller coil L1 is grounded. The voltage regulator circuit (3) is connected to the MOS transistor conduction circuit (2) and regulates the voltage of the MOS transistor conduction circuit (2).

2. The pin-pulling device control circuit according to claim 1, characterized in that, The voltage regulator circuit (3) includes a voltage regulator U1, a capacitor C2 and a power resistor R5; The VIN pin of the voltage regulator U1 is connected to the source (S) terminal of the MOSFET Q1, and is also connected to a 30V input voltage. One end of the capacitor C2 and one end of the resistor R5 are connected to the Vout pin of the voltage regulator U1, and the other end of the resistor R5 is connected to the drain (D) terminal of the MOSFET Q1 and one end of the puller coil L1.

3. The pin-pulling device control circuit according to claim 1, characterized in that, The MOSFET Q1 is a P-channel MOSFET, and its model number is CEA6861.

4. The pin-pulling device control circuit according to claim 2, characterized in that, The voltage regulator U1 is an LDO linear regulator, and its model number is PJ78M05SQ.

5. A pin-pulling device control circuit according to claim 2, characterized in that, The power resistor R5 is a high-power resistor with a power rating of 1W.

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