JPH0734749Y2 - Actuator for air conditioning door drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an actuator for driving an air-conditioning door for driving an air mix door of a vehicle air-conditioning system.

[Description of the Prior Art] In this type of actuator, as disclosed in Japanese Utility Model Laid-Open No. 63-4708 previously proposed by the applicant,
The motor circuit that drives the air mix door, the potentiometer that detects the opening degree of the air mix door, and the opening degree that the air mix door responds to the control signal based on the opening signal from the potentiometer and the control signal given from the outside. Some control circuits have a built-in comparison control circuit for controlling the motor circuit. In such a conventional actuator, a motor circuit, a comparison control circuit, and a potentiometer are inserted in parallel between a single power supply terminal and ground, and a battery voltage is applied to them through the power supply terminal. Has become. That is, the power source of the potentiometer is common to the power source of the motor circuit and the like, and is limited to the battery voltage.

[Problems to be Solved by the Invention] By the way, in such an actuator, constant voltage drive of the potentiometer may be required from the viewpoint of higher precision control. However, the conventional actuator cannot supply a constant voltage to the potentiometer because it is limited to the battery voltage. If it is possible to arbitrarily select and use a common power supply with the motor circuit etc. and a different power supply with the same actuator,
Not only can actuators with the same structure be widely used, but also parts management and the like can be facilitated.

The present invention has been made based on the above viewpoint, and an object thereof is to provide an actuator for driving an air-conditioning door, which can selectively adopt a common power source and a different power source for the potentiometer as needed.

[Means for Solving the Problems] In the present invention, a first power supply terminal, a second power supply terminal,
A signal input terminal, a ground terminal, a motor circuit for driving an air conditioning door, which is inserted between the first power supply terminal and the ground terminal, and between the second power supply terminal and the ground terminal. A potentiometer that gives an opening signal indicating the opening of the air-conditioning door, and an opening signal from the potentiometer, which is inserted in parallel with the motor circuit between the first power supply terminal and the ground terminal. Based on a control signal given through the signal input terminal, a comparison control circuit that controls the motor circuit so that the air conditioning door has an opening degree according to the control signal, and the first power supply terminal from the second power supply terminal. The first power supply terminal and the second power supply terminal are arranged such that the direction toward the power supply terminal is the forward direction.
A diode inserted between the power supply terminal, the first power supply terminal is an empty terminal, and only the second power supply terminal is connected to the power supply, thereby supplying power to the potentiometer to the motor circuit and the comparison circuit. The power source of the potentiometer is shared by the power source of the control circuit, the first power source terminal is connected to the power source, and the second power source terminal is connected to a constant power source different from the power source. The above object is achieved by an actuator for driving an air-conditioning door, which can be made to have a constant voltage separately from the power source of the control circuit.

[Operation] When the power supply of the potentiometer is set to the battery voltage common to the motor circuit and the like, the first power supply terminal is made an empty terminal and the battery voltage is applied to the second power supply terminal. Since the diode has a forward direction from the second power supply terminal to the first power supply terminal, the battery voltage is applied to the potentiometer, the motor circuit, and the like. On the contrary,
When a constant voltage is applied to the potentiometer and a battery voltage is applied to the motor circuit or the like, the battery voltage is applied to the first power supply terminal and the constant voltage is applied to the second power supply terminal. The battery voltage is not applied to the potentiometer by the diode.

[Embodiment of the Invention] FIG. 1 is a block diagram showing an embodiment of the present invention.

In the figure, 1 is an actuator for driving the air mix door 2, a motor 4 connected to the air mix door 2 through a gear mechanism (not shown) in an actuator case 3, and a drive circuit 5 for driving the motor 4. Drive circuit 5
A control circuit 6 for controlling the temperature, a potentiometer 7 for detecting the opening of the air mix door 2 and giving an opening signal to the comparison control circuit 6, and a diode 8, and a first power supply terminal 9 Second power supply terminal 10 and signal input terminal 11
And a ground terminal 12. As is well known, the air mix door 2 is arranged between an evaporator and a heater core of a vehicle air conditioning system (not shown), and adjusts the mixing ratio of cold air and warm air according to the opening degree. . The drive circuit 5 is inserted between the first power supply terminal 9 and the ground terminal 12, and drives the motor 4 forward / reversely in response to the drive signal from the comparison control circuit 6. The comparison control circuit 6 is inserted between the first power supply terminal 9 and the ground terminal 12 in parallel with the drive circuit 5, and has a signal input terminal 11
A control signal given from the outside via an input signal and an opening degree signal given from the potentiometer 7 are inputted, and a drive signal is given to the drive circuit 5 based on these signals, whereby the air mix door 2 sets the opening degree according to the control signal. The comparison is controlled so that The potentiometer 7 is inserted between the second power supply terminal 10 and the ground terminal 12, and its slider moves with the air mix door 2 to give an opening signal to the comparison control circuit 6. There is. Diode 8
The first power supply terminal 9 and the second power supply terminal 10 so that the direction from the second power supply terminal 10 to the first power supply terminal 9 is the forward direction.
Has been inserted between and.

According to the actuator having such a configuration, the power supply of the potentiometer 7 can be shared with the power supply of the drive circuit 5 and the comparison control circuit 6 by the connection shown in FIG. 2, and by the connection shown in FIG. The power supply of the potentiometer can be a constant voltage separately from the power supply of the drive circuit 5 and the comparison control circuit 6.

FIG. 2 is a connection diagram when the power source of the potentiometer 7 is shared with the power source of the drive circuit 5 and the comparison control circuit 6, and the first power source terminal 9 is an empty terminal and the battery voltage is applied to the second power source terminal 10. To be done. Reference numeral 20 denotes a temperature setter inserted between the battery and the ground, which gives a control signal to the signal input terminal 11 of the actuator 1. With such a connection, the battery voltage is applied to the drive circuit 5 and the comparison control circuit 6 through the diode 8 and the battery voltage is also applied to the potentiometer 7.

FIG. 3 is a connection diagram in the case where the power supply of the potentiometer 7 is made into a constant voltage separately from the power supply of the drive circuit 5 and the comparison control circuit 6, and the battery voltage is applied to the first power supply terminal 9 to connect the battery and the ground. A constant voltage is applied to the second power supply terminal 10 by the Zener diode 30 inserted in the. Reference numeral 31 is a temperature setting device, which is inserted in parallel with the Zener diode 30 and applies a control signal to the signal input terminal 11 of the actuator 1. According to such a connection, the battery voltage is applied to the drive circuit 5 and the comparison control circuit 6, but is not applied to the potentiometer 7 due to the presence of the diode 8, and the potentiometer 7 receives a constant voltage through the second power supply terminal 10. Will be applied.

[Advantages of the Invention] As described above, according to the present invention, by providing two power supply terminals and connecting them through a diode,
Since it is configured to be able to selectively adopt either common power supply or separate power supply, we provide actuator for air conditioning door drive that can select common power supply of potentiometer and separate power supply as needed. Therefore, not only can actuators having the same structure be widely used, but also parts management and the like can be facilitated.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a connection diagram when the power source of the potentiometer is shared with the drive circuit and the power source of the comparison control circuit, and FIG. 3 is a drive circuit of the potentiometer power source. FIG. 6 is a connection diagram in the case where a constant voltage is provided separately from the power supply of the comparison control circuit. 1 ... Actuator, 2 ... Air mix door, 4 ...
… Motor, 5 …… Drive circuit 6 …… Comparison control circuit, 7 …… Potentiometer 8 …… Diode, 9 …… First power supply terminal 10 …… Second power supply terminal

Claims (1)

[Scope of utility model registration request] 1. A first power supply terminal, a second power supply terminal, a signal input terminal, a ground terminal, and for driving an air conditioning door inserted between the first power supply terminal and the ground terminal. A motor circuit, a potentiometer inserted between the second power supply terminal and the ground terminal for giving an opening signal indicating the opening of the air conditioning door, and between the first power supply terminal and the ground terminal. The motor circuit is inserted in parallel with the motor circuit, and based on an opening signal from the potentiometer and a control signal provided through the signal input terminal, the motor circuit so that the air conditioning door has an opening corresponding to the control signal. And a comparison control circuit that controls the first power supply terminal and the second power supply terminal so that the direction from the second power supply terminal to the first power supply terminal is a forward direction. And a diode that is inserted, and the first power supply terminal is an empty terminal and only the second power supply terminal is connected to a power supply, so that the power supply of the potentiometer is common to the power supply of the motor circuit and the comparison control circuit. By connecting the first power supply terminal to a power supply and connecting the second power supply terminal to a constant power supply different from the power supply, the power supply of the potentiometer is different from the power supply of the motor circuit and the comparison control circuit. An actuator for driving an air-conditioning door that can be made to have a constant voltage separately.