JPH04133686A - Power control circuit - Google Patents

Abstract

PURPOSE:To prevent erroneous operation by providing a delay circuit for delaying an input pulse and counting the delayed pulse upon occurrence of a reset pulse. CONSTITUTION:Upon turn ON of a switch SW, a timer circuit 2 begins time limit operation and power is fed to each circuit from a power supply circuit 6 during time limit operation of the timer circuit 2. A counter 4 is reset concurrently with the start of power supply from the power supply circuit 6. When the counter 4 is reset, output level at first output terminal O1 goes 'H' thus sustaining a transistor T3 in ON state. Since the output level at the second output terminal O2 of the counter 4 is 'L' at that time an oscillation circuit 5 functions. Consequently, a switching element Q is turned ON intermittently by the output from the oscillation circuit 5 thus bringing supply power to a motor M into low state.

Description

[Detailed description of the invention] [Industrial application field]

The present invention provides a power control circuit that changes power supplied to a load in stages every time an input pulse generated by a switch or the like is input.

[Conventional technology]

Conventionally, a power control circuit as shown in FIG. 6 has been provided. In this circuit configuration, switch SW
Each time the motor M is turned on, a power control switching element Q connected in series to the motor M, which is a load, is turned on and off, thereby causing the motor M to rotate and stop. That is, when the switch SW is turned on, a trigger pulse with a constant width is output from the trigger pulse generation circuit 1, and the transistor T3. T2 is turned on to start supplying power from the power supply circuit 6 to each circuit, and also to start the time-limiting operation of the timer circuit 2. During the time-limiting operation of the timer circuit 2, the transistors T, is turned on. Further, when power supply from the power supply circuit 6 starts, the switching element Q is turned on. The timer circuit 2 is configured to stop the time-limiting operation when the input level to the input terminal (base of the transistor T4) changes from "LT" to "H" during the time-limiting operation, and when the switch SW is turned on for the second time. When the trigger pulse is generated, the time-limited operation is stopped and the switching element Q is turned off.Therefore, when the switch SW is turned on once, the zener as shown in Figure 7(a) is activated. The voltage across the diode ZD is input to the trigger pulse generating circuit 1, and the trigger pulse as shown in FIG. 7(d) is obtained from the trigger pulse generating circuit 1. The timer circuit 2 starts the time-limiting operation as shown in FIG. 7(c), and the power supply circuit 6 starts supplying power as shown in FIG.
It will stop after a set time. Furthermore, if the switch SW is turned on again while the motor M is rotating, the output level of the timer circuit 2 becomes "L" once as shown in FIG. 7(d), and the rotation of the motor M is stopped. . Further, when the motor M stops, the transistor T is turned off and the power supply circuit 6 is disconnected from the power supply, thereby preventing wasteful power consumption. The above conventional configuration only instructs the motor M to rotate and stop, and adjusts the power supplied to the motor M to control the motor M.
It is not possible to change the rotation speed of the In contrast, a circuit configuration as shown in FIG. 8 has been considered to control the power supplied to the motor M. In this circuit, the configurations with the same numbers as in FIG.
This is equivalent to the configuration shown in the figure. Here, by using the microcomputer 10, the power supplied to the motor M is configured to change stepwise each time the switch SW is turned on. That is, Fig. 9 (a
), when the switch SW is turned on once, the supplied power decreases as shown in FIG. 9(b), and the switch SW
When the switch SW is turned on for the second time, the supplied power increases, and when the switch SW is turned on for the third time, the power supply to the motor M is stopped.The state changes every time the switch SW is turned on. This is done so that it changes cyclically. However, when using the microcomputer 10,
The problem arises that it takes time and cost to develop a program, and it is difficult to make changes because it is necessary to review the entire program when changing the design. Therefore, it is conceivable to use a counter instead of the microcomputer 10. That is, the output of the counter changes every time the switch SW is turned on,
It is conceivable to control the power supplied to the motor M in accordance with the output value of the counter.

[Problem to be solved by the invention]

However, as mentioned above, in order to prevent wasteful power consumption, it is necessary to supply power after the switch is turned on once, so when the switch is turned on for the first time, this on operation causes At the same time as the power supply starts, this ON operation must be counted by a counter.In other words, the operation immediately after the power supply to the counter starts is unstable and counting is performed, which may cause malfunction. In addition, normal operation of the counter is not guaranteed unless it is reset when the power is turned on, but since it is necessary to supply power and count when the switch is turned on, there is a problem that the counter cannot be reset. arise. The present invention aims to solve the above problem, and uses a counter to count the number of human pulses generated by a switch, etc., and changes the power supplied to the load in stages according to the count value of the counter. The present invention aims to provide a power control circuit that resets a counter with the first human pulse and allows counting of the human pulse after the operation of the counter stabilizes, thereby preventing malfunctions. It is something to do.

[Means to solve the problem]

In order to achieve the above object, the present invention uses a counter to count the number of input pulses generated by a switch, etc., and changes the power supplied to the load in stages according to the counted value of the counter. In the control circuit, there is a power supply circuit that starts power supply to the counter with the first human pulse, a reset pulse generation circuit that generates a reset pulse to the counter when power supply starts from the power supply circuit, and a delay that delays the input pulse. A delay circuit that generates a pulse and causes a counter to count the delayed pulse after the reset pulse is generated is provided.

[Effect]

According to the above configuration, there is a power supply circuit that starts power supply to the counter in response to the first input pulse, a reset pulse generation circuit that generates a reset pulse to the counter when power supply starts from the power supply circuit, and a reset pulse generation circuit that delays the input pulse. A delay circuit that generates a delayed pulse and counts the delayed pulse with a counter after the reset pulse is generated is provided.
After the first input pulse starts supplying power to the counter, resets the counter, and stabilizes the operation of the counter, the counter counts a delayed pulse that delays the first input pulse, which prevents malfunction of the counter. It is prevented.

【Example】

This example shows an example in which a lead-acid battery (not shown) is used as a power source and a motor is used as a load to control the power supplied to the load in two stages. It is not necessarily limited to this. As shown in FIG. 1, a field effect transistor for controlling supply power is connected in series as a switching element Q to a motor M as a load. The switching element Q is
Each time the switch SW is turned on, it is cyclically switched between an intermittently on state, a continuous on state, and an off state. In other words, the power supplied to the motor M can be set in two levels, large and small, and a state in which the switching element Q is intermittently turned on corresponds to a state in which the supplied power is low, and a state in which the switching element Q is turned on continuously. The state corresponds to a state where the supplied power is high. Switch SW includes resistor R3 and Zener diode Z
D and this series circuit is connected across the power supply. A connection point between the resistor R4 and the Zener diode ZD is connected to a trigger pulse generation circuit 1 that generates a trigger pulse of a constant width when the switch SW is turned on. In other words, although the time the switch SW is turned on is not constant,
When the switch is turned on, the trigger pulse generating circuit 1 outputs a trigger pulse of a constant width formed by the resistors R2 to R1 and the capacitor C1. The trigger pulse generating circuit 1 is supplied with power from both ends of the Zener diode ZD while the switch SW is on. In this manner, the trigger pulse generating circuit 1 generates a trigger pulse from which chattering of the switch SW has been removed, and this trigger pulse becomes an input pulse. When a trigger pulse is output from the trigger pulse generating circuit 1, the transistors T, -T3 are turned on. When the transistor T is turned on, the input to the timer circuit 2 becomes "H" and the timer circuit 2 starts a time-limiting operation. The timer circuit 2 is mainly composed of an integrated circuit IC, and when the base of the transistor T4 becomes "H", it starts a time-limiting operation and sets the output level to "H" at a certain time.
When the base of the transistor T4 becomes "H" again during the time-limiting operation, the time-limiting operation is stopped. Further, the time limit of the timer circuit 2 is determined by resistors R, , R and capacitor C2. The output terminal of the timer circuit 2 is connected to the base of the transistor T1, and the transistor T is kept in an on state while the timer circuit 2 is in a time-limiting operation. That is, after the trigger pulse is generated and the transistors T, T2 are turned on, when the trigger pulse falls, the transistor T2 is turned off, but while the timer circuit 2 continues its time-limited operation, the transistor T1 is turned on. It remains on. The transistor T1 is inserted between the power supply and the power supply circuit 6, and during the period when the transistor T is on, power is supplied from the power supply circuit 6 to each part. The trigger pulse output from the trigger pulse generating circuit 1 is delayed by the resistor R and the capacitor C1, and triggers the monostable multivibrator 3. The monostable multivibrator 3 makes the inverted output "L" for a certain period of time determined by the resistor R and the capacitor C1. The inverted output of the monostable multivibrator 3 is input as a delayed pulse obtained by delaying the input pulse to a counter 4 consisting of a Johnson counter that counts the rising edge of the input. That is, the resistor R7, the capacitor C3, and the monostable multivibrator 3 constitute a delay circuit. The counter 4 has three output terminals 01 to 03, and each time the input rises, the output level of each output terminal 01 to O0 is sequentially and selectively set to "H". First output terminal 0. and the second output terminal o2 are connected to the base of the transistor T3 via an OR circuit OR, so that while either one is at "H", the transistor T is kept on. Therefore, when the switch SW is turned on once, the transistor T is turned on and the timer circuit 2 starts time-limiting operation, and at this time, the output of the counter 4 keeps the transistor T3 in the on state. Next, switch S
Even when transistor W is turned on, transistor T is kept on, and the timer circuit 2 continues to perform a time-limiting operation. By the way, the monostable multivibrator 3 is an integrated circuit I
The main component is C2, and this integrated circuit I
In addition to monostable multivibrator 3, C2 is a resistor R5.
A monostable multivibrator 3a whose pulse width is determined by a capacitor C5 is also provided, and this monostable multivibrator 3a is triggered by turning on the power to reset the counter 4. That is, the monostable multivibrator 3a is connected to the power supply circuit 6
It operates as a reset circuit that generates a reset pulse to the counter 4 when the power supply starts. The operation after the power is turned on until the output is obtained from the counter 4 is as shown in FIG. 3. When the output of the power supply circuit 6 rises as shown in FIG. As shown in b), the monostable multivibrator 3a outputs a pulse to reset the counter 4. In addition, the monostable multivibrator 3 is inputted as shown in Figure 3(c), and the inverted output terminal of the monostable multivibrator 3 is delayed with the rise of the power supply as shown in Figure 3<d). output. In this way, by counting the rising edge of the output from the inverting output terminal of the monostable multivibrator 3, an output as shown in FIG. 3 (e>) is obtained from the first output terminal 01 of the counter 4. The output terminal 02 is connected to control the operation of the oscillation circuit 5, and when the output level from the counter 4 is "H", the oscillation circuit 5
When the oscillation operation is stopped and the output level is set to "H", and the control terminal is at the "L" level, resistors R14 and R+
The oscillation operation is performed at a period determined by the capacitor C6 and the capacitor C6. That is, once the switch SW is turned on, the output level of the first output terminal O4 of the counter 4 becomes "H".
Since the output level of the second output terminal 02 is "°L", the oscillation circuit 5 performs oscillation operation at a constant cycle at this time, and when the switch SW is turned on again, the second output of the counter 4 The output level of terminal 02 becomes "H" and the oscillation operation is stopped. The output of the oscillation circuit 5 is input to the control terminal (gate) of the switching element Q via the compensation circuit 9. The compensation circuit 9 removes the accumulated Wt charge at turn-off to improve the turn-off waveform. Third output terminal 0 of counter 4. , a pair of resistors R11
, R, 2 are connected in series, and the connection point between both resistors RR12 is connected to one input terminal of the comparator circuit 7. The reference voltage set by the reference voltage generation circuit 8 is input to the other input terminal of the comparator circuit 7, and the third input terminal of the counter 4
When the output level of the output terminal 03 becomes "H", the output level of the comparator circuit 7 becomes "L". The output terminal of the comparison circuit 7 is connected to the reset terminal of the timer circuit 2. When this reset terminal is at the "H" level, the timer circuit 2 performs a normal time-limiting operation, and when the reset terminal becomes "L" level, the timer circuit 2 stops the time-limiting operation. The reset terminal is pulled up by a resistor R1) and a capacitor C7, and is connected to the third output terminal 0. When the output level of the circuit becomes "H", a time-determined operation is performed. According to the above configuration, as shown in FIG. 2(a), the switch S
When W is turned on once, the timer circuit 2 starts time-limited operation as shown in FIG. become. Also, at the same time as the power supply from the power supply circuit 6 starts, as shown in FIG.
Counter 4 is reset as follows. After the counter 4 is reset, the first output terminal Q is output as shown in FIG. 2(e).
The output level of I is set to °H and the transistor T is kept on.At this time, as shown in Fig. 2(f), the counter 4
Since the output level of the second output terminal 02 of is "L",
The oscillation circuit 5 will perform an oscillation operation. As a result, as shown in FIG. 2(c), the switching element Q is connected to the oscillation circuit 5.
It is intermittently turned on by the output of the motor M, and the power supplied to the motor M is in a low state. As shown in FIG. 2(a), when the switch SW is turned on for the second time, the timer circuit 2 continues its time-limiting operation, and as shown in FIG. 2(f), the second output of the counter 4 The output level of terminal 02 becomes "H". Therefore, the oscillation circuit 5 stops the oscillation operation and sets the output level to °H.As a result, as shown in FIG. 2(c), the switching element Q is continuously turned on, and the motor M
The power supplied to is in a large state. As shown in FIG. 2(a), when the switch SW is turned on for the third time, the third output terminal 0 of the counter 4 is turned on as shown in FIG. 2(g). The output level of the comparator circuit 8 becomes "H", the output level of the comparator circuit 8 becomes "L", the time limit operation of the timer circuit 2 is stopped, and the power supply from the power supply circuit 6 to each circuit is stopped.
The output level of the oscillator circuit 5 becomes °"L'°, and as shown in Fig. 2 (
As in c), the motor M stops. As described above, every time you turn on the switch SW,
The state in which the power supplied to the motor M is small -> the state in which the power supplied to the motor M is large - the state in which the motor M stops is cyclically repeated. The power control circuit configured as described above can be used, for example, to control the motor of a pine surge device that generates air bubbles along with water flow in a bathtub or the like. As shown in Fig. 4, the pine surge device takes in air from an air supply port 12 provided on the top surface of a float 11 formed to float on water, and is provided in the center of a pump device 13 placed underwater. Air bubbles are discharged from the discharge port 14 along with the water flow. The pump device 13 is shown in FIG. 5(a).
As shown in FIG. 2, a screw 16 is connected to a rotating shaft 15 of a motor M made of a DC motor, and the rotation of the screw 16 mixes the air taken in from the air supply port 12 with the water flowing into the pump device 13. Pressure is applied to discharge port 14.
It is discharged from As shown in FIG. 5(b), the pump device 13 houses a circuit board 18 and a lead-acid battery (not shown) housed in a waterproof case 17. By using the reed switch 19 as the switch SW, the circuit section mounted on the circuit board 18 is controlled. As shown in FIG. 5(c), a permanent magnet 21 is disposed near one reed switch and is linked to a push button 20 disposed at a key point of the pump device 13. When the push button 20 is pressed, a permanent magnet 21 is provided. The magnet 21 is moved so that the reed switch SW is turned on. Therefore, by employing the above circuit configuration in this pine surge device, each time the push button 20 is pressed, the water flow repeats from weak to strong and stops.

【Effect of the invention】

As described above, the present invention includes a power supply circuit that starts supplying power to the counter in response to the first input pulse, a reset pulse generation circuit that generates a reset pulse to the counter when power supply from the power supply circuit starts, and A delay circuit is provided which generates a delayed pulse and counts the delayed pulse by a counter after the reset pulse is generated, so that the first input pulse starts supplying power to the counter and resets the counter. After the operation has stabilized, the counter counts the delayed pulses that are delayed from the first input pulse, which has the advantage of preventing malfunctions of the counter.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing an embodiment of the present invention, Figs. 2 and 3 are explanatory diagrams of the operation of the above, Fig. 4 is a perspective view showing a pine surge device using the above, and Fig. 5 is a circuit diagram showing the same as the above. Fig. 6 is a circuit diagram showing a conventional example, Fig. 7 is a detailed perspective view of the pine surge device.
FIG. 8 is a block diagram showing another conventional example, and FIG. 9 is an explanatory diagram of the same operation. 1...Trigger pulse generation circuit, 2...Timer circuit,
333a... Monostable multivibrator, 4... Counter, 5... Oscillation circuit, 6... Power supply circuit, 7...
Comparison circuit, 8... Reference voltage generation circuit, 9... Compensation circuit, M... Motor, Q... Switching element, SW...
·switch. Agent Patent Attorney Ishi 1) Chief 7 Figure 2 Figure 3 Figure 7 Ij! J Voluntary proposal to write procedural amendments) January 19, 1991

Claims (1)

[Claims] (1) In a power control circuit that uses a counter to count the number of input pulses generated by a switch, etc., and changes the power supplied to the load in stages according to the count value of the counter, the first input A power supply circuit that starts power supply to the counter with a pulse, a reset pulse generation circuit that generates a reset pulse to the counter when power supply from the power supply circuit starts, and a reset pulse generation circuit that generates a delayed pulse that delays the input pulse and generates a reset pulse after the reset pulse is generated. A power control circuit comprising: a delay circuit for counting delayed pulses by a counter.