Rotating speed control circuit for condenser fan

Abstract

The utility model relates to a rotating speed control circuit for a condenser fan, which comprises a silicon controlled rectifier optical coupler OP1, the anode of the silicon controlled rectifier optical coupler OP1 is connected to the anode of a power supply VCC through a resistor R14, and the cathode of the silicon controlled rectifier optical coupler OP1 is connected to the PWM output end of a micro control unit MCU through a relay RY0; a first terminal of the silicon controlled rectifier optical coupler OP1 is connected with a control end G of the bidirectional silicon controlled rectifier Q5, a first main terminal of the bidirectional silicon controlled rectifier Q5 is connected with one end of the capacitor C6 and the connector J6 respectively, and the other end of the capacitor C6 is connected to one end of the resistor R15; a second terminal of the silicon controlled rectifier optocoupler OP1 is connected to one end of a resistor R13, the other end of the resistor R13, a second main terminal of the bidirectional silicon controlled rectifier Q5 and the other end of a resistor R15 are respectively connected to a live wire L, and the live wire L is connected with a pin 1 of the radiator SR1.

Description

Technical Field

[0001] The utility model relates to the field of refrigeration, and in particular to a speed control circuit for a condenser fan. Background Art

[0002] As is known to all, when the ambient temperature is low, the condensing pressure of the condenser is often very low, which makes the pressure difference at both ends of the throttling device smaller, thereby making the internal refrigeration system of the system not circulated, resulting in refrigeration system failure.

[0003] In order to meet the requirements of normal use of ice makers in high and low temperature environments and reduce failures caused by high and low temperatures, a new circuit that can control the condenser fan pressure is needed to achieve high heat dissipation in high ambient temperature environments and reduce heat dissipation in low ambient temperature environments, which is particularly important. Utility Model Content

[0004] In view of the above technical problems in the related art, the present invention proposes a speed control circuit for a condenser fan, which can overcome the above deficiencies in the prior art.

[0005] In order to achieve the above technical objectives, the technical solution of the present utility model is implemented as follows:

[0006] A speed control circuit for a condenser fan includes a thyristor optocoupler OP1, wherein the anode of the thyristor optocoupler OP1 is connected to the anode of a power supply VCC via a resistor R14, and the cathode of the thyristor optocoupler OP1 is connected to the PWM output terminal of a microcontroller unit MCU via a relay RY0;

[0007] The first terminal of the thyristor optocoupler OP1 is connected to the control terminal G of the bidirectional thyristor Q5. The first main terminal of the bidirectional thyristor Q5 is connected to one end of the capacitor C6 and the connector J6 respectively. The other end of the capacitor C6 is connected to one end of the resistor R15.

[0008] The second terminal of the thyristor optocoupler OP1 is connected to one end of the resistor R13. The other end of the resistor R13, the second main terminal of the bidirectional thyristor Q5 and the other end of the resistor R15 are respectively connected to the live wire L, which is connected to the pin 1 of the heat sink SR1.

[0009] Preferably, the thyristor optocoupler OP1 is MOC3021 or MOC3041.

[0010] Preferably, the bidirectional thyristor Q5 is preferably BTA16-600B.

[0011] Preferably, a resistor R17 and a light emitting diode LED2 are further connected in series between the anode and the cathode of the thyristor optocoupler OP1.

[0012] Preferably, the resistance of the resistor 17 is 10KΩ.

[0013] Preferably, the light emitting diode LED2 is a red light emitting diode.

[0014] Preferably, the voltage value of the power supply VCC is 12V.

[0015] Preferably, the size of the heat sink SR1 is 10 mm×15 mm×20 mm.

[0016] Preferably, the resistance value of the resistor R4 is preferably 1KΩ, the resistance value of the resistor R13 is preferably 1KΩ, and the resistance value of the resistor R15 is preferably 39KΩ.

[0017] Preferably, the capacitor C6 is a 102 / 1KV high-voltage ceramic capacitor.

[0018] Preferably, the connector J6 is domestic / DJ6227-J6.3.

[0019] The beneficial effects achieved by the utility model are as follows: This product, by adding thyristor optocouplers and bidirectional thyristors to the current PCB board for collaborative control, adjusts the thyristor conduction time according to the change of ambient temperature to adjust the fan input voltage, and then adjusts the fan speed, so as to meet high and low temperature working conditions, and realizes that the ice maker can adapt to various working conditions with a relatively small cost increase and structural change.

[0020] Compared with existing ice maker fan control circuits and control methods, this product has the following advantages: (A) The ice-making system is more stable. The condenser fan can adjust the internal pressure of the ice maker by controlling the speed, so that the ice maker will not change too much due to changes in the external ambient temperature. (B) The pressure method is more accurate, with smaller structural changes, and is more convenient for use. For example, compared with the current conventional method of turning the fan on and off according to the ambient temperature, adjusting the fan speed is more accurate. Compared with reducing the heat exchange area of ​​the condenser, adjusting the fan speed by the fan will cause smaller structural changes. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The utility model is described in further detail below with reference to the accompanying drawings.

[0022] Figure 1 This is a logic structure diagram of the speed control circuit for the condenser fan described in the utility model.

[0023] Figure 2 This is a diagram of the implementation steps of the speed control circuit for the condenser fan described in the utility model. DETAILED DESCRIPTION

[0024] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments.

[0025] like Figure 1 As shown, in order to facilitate understanding of the above technical solutions of the present invention, the above technical solutions of the present invention are described in detail below through specific usage methods.

[0026] During implementation, the speed control circuit for the condenser fan includes a thyristor optocoupler OP1, the anode of the thyristor optocoupler OP1 is connected to the anode of the power supply VCC through a resistor R14, and the cathode of the thyristor optocoupler OP1 is connected to the PWM output terminal of the microcontroller unit MCU through a relay RY0;

[0027] The first terminal of the thyristor optocoupler OP1 is connected to the control terminal G of the bidirectional thyristor Q5. The first main terminal of the bidirectional thyristor Q5 is connected to one end of the capacitor C6 and the connector J6 respectively. The other end of the capacitor C6 is connected to one end of the resistor R15.

[0028] The second terminal of the thyristor optocoupler OP1 is connected to one end of the resistor R13. The other end of the resistor R13, the second main terminal of the bidirectional thyristor Q5 and the other end of the resistor R15 are respectively connected to the live wire L, which is connected to the pin 1 of the heat sink SR1.

[0029] In one embodiment, the thyristor optocoupler OP1 is preferably MOC3021 or MOC3041.

[0030] In one embodiment, the bidirectional thyristor Q5 is preferably BTA16-600B.

[0031] In one embodiment, a resistor R17 and a light emitting diode LED2 are connected in series between the anode and the cathode of the thyristor optocoupler OP1.

[0032] In one embodiment, the resistance of the resistor R17 is preferably 10KΩ.

[0033] In one embodiment, the light emitting diode LED2 is preferably a red light emitting diode.

[0034] In one embodiment, the voltage value of the power supply VCC is 12V.

[0035] In one embodiment, the size of the heat sink SR1 is preferably 10 mm×15 mm×20 mm.

[0036] In one embodiment, the resistance of the resistor R4 is preferably 1KΩ, the resistance of the resistor R13 is preferably 1KΩ, and the resistance of the resistor R15 is preferably 39KΩ.

[0037] In one embodiment, the capacitor C6 is preferably a 102 / 1KV high voltage ceramic capacitor.

[0038] In one embodiment, connector J6 is preferably domestic / DJ6227-J6.3.

[0039] Working principle: The PWM output by the microcontroller unit MCU can be controlled by program to control the speed, and then transmitted to the speed control circuit. In this product, the live wire L is connected to the radiator for temperature control; the connector J6 can be connected to the fan, thereby improving the existing ice maker fan control circuit. The implementation steps of this product can be referred to Figure 2 As shown, this can be achieved by combining existing common knowledge, conventional means and the design of this product. Figure 2 The implementation steps shown are methods and do not fall within the scope of the object of the utility model. Figure 1 , is sufficient to implement and realize it, so I will not go into details about the implementation steps here.

[0040] In summary, this application adopts the above-mentioned unique technical solution. Compared with the existing ice maker fan control circuit and its control method, this product has the following advantages: (A). The ice making system is more stable, and the condenser fan can adjust the internal pressure of the ice maker by controlling the speed, so that the ice maker will not change too much due to changes in the external ambient temperature; (B). The pressure method is more accurate, the structural changes are smaller, and it is more conducive to use. For example, compared with the current conventional method of turning the fan on and off according to the ambient temperature, adjusting the fan speed is more accurate. Compared with reducing the heat exchange area of ​​the condenser, the structural changes by adjusting the fan speed are smaller.

[0041] In the description of the present invention, it should be understood that the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

Claims

1. A speed control circuit for a condenser fan, characterized in that: The thyristor optocoupler OP1 includes an anode of the thyristor optocoupler OP1 connected to the anode of the power supply VCC via a resistor R14, and a cathode of the thyristor optocoupler OP1 connected to the PWM output terminal of the microcontroller unit MCU via a relay RY0; The first terminal of the thyristor optocoupler OP1 is connected to the control terminal G of the bidirectional thyristor Q5, the first main terminal of the bidirectional thyristor Q5 is connected to one end of the capacitor C6 and the connector J6 respectively, and the other end of the capacitor C6 is connected to one end of the resistor R15; The second terminal of the thyristor optocoupler OP1 is connected to one end of the resistor R13, and the other end of the resistor R13, the second main terminal of the bidirectional thyristor Q5, and the other end of the resistor R15 are respectively connected to the live wire L, and the live wire L is connected to the pin 1 of the heat sink SR1.

2. The speed control circuit according to claim 1, wherein: The thyristor optocoupler OP1 is MOC3021 or MOC3041.

3. The speed control circuit according to claim 1, wherein: The bidirectional thyristor Q5 is BTA16-600B.

4. The speed control circuit according to claim 1, wherein: A resistor R17 and a light emitting diode LED2 are connected in series between the anode and cathode of the thyristor optocoupler OP1.

5. The speed control circuit according to claim 4, characterized in that: The resistance of the resistor R17 is 10KΩ.

6. The speed control circuit according to claim 4, wherein: The light emitting diode LED2 is a red light emitting diode.

7. The speed control circuit according to claim 1, wherein: The voltage value of the power supply VCC is 12V.

8. The speed control circuit according to claim 1, wherein: The dimensions of the heat sink SR1 are 10 mm×15 mm×20 mm.

9. The speed control circuit according to claim 1, wherein: The resistance of the resistor R4 is 1KΩ, the resistance of the resistor R13 is 1KΩ, and the resistance of the resistor R15 is 39KΩ.

10. The speed control circuit according to claim 1, wherein: The capacitor C6 is a 102 / 1KV high voltage ceramic capacitor.

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