CN203025512U - Time setting circuit of knob type time relay - Google Patents
Time setting circuit of knob type time relay Download PDFInfo
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- CN203025512U CN203025512U CN 201220755024 CN201220755024U CN203025512U CN 203025512 U CN203025512 U CN 203025512U CN 201220755024 CN201220755024 CN 201220755024 CN 201220755024 U CN201220755024 U CN 201220755024U CN 203025512 U CN203025512 U CN 203025512U
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- time
- potentiometer
- main control
- control unit
- setting circuit
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Abstract
The utility model relates to a time setting circuit of a knob type time relay. The time setting circuit comprises a potentiometer, a full-scale time value setting circuit and a central processing unit (CPU) main control unit, wherein the CPU main control unit is used for calculating resistance percentage of the potentiometer and calculating the current set time according to a full-scale time value; a reference voltage V+ is accessed into an analog-to-digital conversion unit of the CPU main control unit through voltage sharing of a sliding point of the potentiometer W; and an output port of the CPU main control unit is connected to the control end of an electronic switch module. The resistance percentage of the potentiometer is internalized into the set time; after the time is set, a ratio of a resistance value of the sliding point of the potentiometer to a main resistance value of the potentiometer is a constant value and cannot change with ambient temperature and fluctuation of voltage; and therefore, the problem of resistance deflection caused by change of the ambient temperature and the fluctuation of the voltage on the resistance value of the potentiometer is solved; the time delay precision of the knob type time relay is improved; and the time delay error is reduced.
Description
Technical field
The utility model relates to a kind of time setting circuit of the knob time relay.
Background technology
The existing knob time relay adopts potentiometer to come setting-up time mostly, and principle is sent the square wave of the certain frequency of multivibrator output into binary counter as shown in Figure 1, counts, and reaches the purpose of time-delay output.Here, can change the output frequency of multivibrator by the sliding point that changes potentiometer W, and then set the time of time-delay.The defective of this knob time relay is: the potentiometer that the RC oscillator adopts is generally carbon film or metal film potentiometer, affected by environment temperature, voltage fluctuation larger, easily produces delay time error, greatly reduces the delay precision of the time relay.
Summary of the invention
The purpose of this utility model is to overcome the defective of prior art, provides a kind of stability strong, has the knob time relay of higher delay precision.
For achieving the above object, the utility model adopts a kind of like this time setting circuit of the knob time relay, and described time setting circuit comprises
Potentiometer, the user changes the sliding point of described potentiometer by the knob on the running time relay;
The full scale time value arranges circuit, is used for arranging full-scale time value;
And the CPU main control unit, be used for calculating the resistance number percent of described potentiometer, and by described full scale time value, calculate the time of current setting;
One reference voltage V+ is through the AD conversion unit of the described CPU main control unit of dividing potential drop access of the sliding point of described potentiometer W, and the output port of described CPU main control unit is connected to the control end of electronic switch module.
Compared with the prior art, the beneficial effects of the utility model are embodied in: the time that turns to setting in the resistance number percent with potentiometer, due to, having set should be after the time, the ratio of the resistance of the sliding point of potentiometer and total resistance of potentiometer is a constant value, can not change because of variation, the voltage fluctuation of environment temperature, thereby, overcome the resistance of potentiometer because of the problem of variation or the skew of voltage fluctuation generation resistance of environment temperature, improve the delay precision of the knob time relay, reduced delay time error.
Especially, described full scale time value arranges circuit and comprises time step switch and time range selector switch, and described time step switch and described time range selector switch are connected to the input port of described CPU main control unit.By setup times step switch and time range selector switch, and by the CPU main control unit, time stepping and time range are made up in twos, realize the setting of full scale time value, circuit structure is simple; In addition, by increasing the number of time step switch and time range selector switch, can easily realize the increase of time gear and the selection of multiple time range.
Description of drawings
Fig. 1 is the schematic diagram of the time setting circuit of the knob time relay in prior art;
Fig. 2 is the schematic diagram of the time setting circuit of the utility model knob time relay.
Embodiment
As shown in Figure 2, a kind of time setting circuit of the knob time relay, time setting circuit comprises
Potentiometer, the user changes the sliding point of potentiometer by the knob on the running time relay;
The full scale time value arranges circuit, is used for arranging full-scale time value;
And the CPU main control unit, be used for calculating the resistance number percent of potentiometer, and by the full scale time value, calculate the time of current setting;
One reference voltage V+ is through the AD conversion unit of the dividing potential drop access CPU of the sliding point of potentiometer W main control unit, and the output port of CPU main control unit is connected to the control end of electronic switch module.
The full scale time value arranges circuit and comprises time step switch and time range selector switch, and time step switch and time range selector switch are connected to the input port of CPU main control unit.
Claims (2)
1. the time setting circuit of a knob time relay, it is characterized in that: described time setting circuit comprises
Potentiometer, the user changes the sliding point of described potentiometer by the knob on the running time relay;
The full scale time value arranges circuit, is used for arranging full-scale time value;
And the CPU main control unit, be used for calculating the resistance number percent of described potentiometer, and by described full scale time value, calculate the time of current setting;
One reference voltage (V+) is through the AD conversion unit of the described CPU main control unit of dividing potential drop access of the sliding point of described potentiometer (W), and the output port of described CPU main control unit is connected to the control end of electronic switch module.
2. the time setting circuit of the knob time relay according to claim 1, it is characterized in that: described full scale time value arranges circuit and comprises time step switch and time range selector switch, and described time step switch and described time range selector switch are connected to the input port of described CPU main control unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220755024 CN203025512U (en) | 2012-12-26 | 2012-12-26 | Time setting circuit of knob type time relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220755024 CN203025512U (en) | 2012-12-26 | 2012-12-26 | Time setting circuit of knob type time relay |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203025512U true CN203025512U (en) | 2013-06-26 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220755024 Expired - Fee Related CN203025512U (en) | 2012-12-26 | 2012-12-26 | Time setting circuit of knob type time relay |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203025512U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112824923A (en) * | 2019-11-21 | 2021-05-21 | 芜湖美的厨卫电器制造有限公司 | Potentiometer resistance value interval updating method of electrical equipment and electrical equipment |
-
2012
- 2012-12-26 CN CN 201220755024 patent/CN203025512U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112824923A (en) * | 2019-11-21 | 2021-05-21 | 芜湖美的厨卫电器制造有限公司 | Potentiometer resistance value interval updating method of electrical equipment and electrical equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130626 Termination date: 20171226 |