JPH08304568A - Power generating circuit of electronic automatic winding wristwatch - Google Patents

Abstract

PURPOSE: To improve the efficiency of power generation of a power generating circuit of an electronic automatic winding wristwatch. CONSTITUTION: A wristwatch driven by using a power supply generated by making a rotary weight rotate comprises a speed increasing gear train engaging with the rotary weight, a rotor engaging with the speed increasing gear train and constituted of a permanent magnet, a stator coupling with the rotor and a coil fixed to the stator. A generator of the wristwatch has a power generating coil 106 and a rotor generated counterelectromotive voltage detecting coil 107. The power generating coil 106 which the generator of the wristwatch has is connected to a power generating circuit 201, which has transistors Tr1 and Tr2 connecting a secondary battery 204 with the power generating coil 106. The transistors Tr1 and Tr2 turn on/off on the basis of a rotor generated counterelectromotive voltage detection signal 212 generated by the rotor generated counterelectromotive voltage detecting coil 107 and form a rectification circuit 218. The rectification circuit 218 formed by the transistors Tr1 and Tr2 is a full-wave rectification circuit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary weight, a speed increasing gear train engaged with the rotary weight, a rotor composed of a permanent magnet engaged with the speed increasing gear train, and a stator coupled to the rotor. The present invention relates to a structure of a power generation circuit to which a power generation coil included in a power generator including a coil fixed to the stator is connected.

[0002]

2. Description of the Related Art FIG. 4 shows a wristwatch generator disclosed in JP-A-60-174976. FIG. 5 is a power generation circuit diagram of the wristwatch generator shown in FIG. Watch case 4
The generator 402 (in FIG. 4, the clock mechanism other than the generator is omitted) installed in 01 has a rotary weight 403 having a semicircular shaped weight, and a speed increasing gear engaged with the rotary weight 403. Wheel trains 404, 405, a rotor 406 made of a permanent magnet engaged with the speed increasing wheel train 405, a stator 407 coupled to the rotor 406, and a coil 40 fixed to the stator 407.
It is composed of 8.

The operation will be described with reference to the conventional power generation circuit diagram shown in FIG. Rotating the weight 4 by shaking the arm
03 is started and rotated, and the rotor 406 is rotated at an increased speed by the speed increasing train wheel 404, 405, and the coil 408 is rotated.
, The back electromotive force is generated by the time-dependent change of the magnetic flux of the permanent magnet of the rotor 406 which links the coil 408, and the generated current 501 is generated in the coil 408. The secondary battery 5 is connected through the diodes D2 and D3 of the power generation circuit connected to the coil 408.
03 is charged. Next, a power generation current 502 is generated, and the power generation current 502 charges the secondary battery 503 through the diodes D4 and D1 of the power generation circuit connected to the coil 408. The generated currents 501 and 502 are full-wave rectified by the diodes D1, D2, D3 and D4,
The secondary batteries 503 are sequentially charged.

[0004]

However, since the rotary weight 403 often does not rotate sufficiently in the daily slight movement of the arm, the electromotive voltage generated in the coil 408 is small. Moreover, since the electromotive voltage is lowered by the forward voltage drop of the diode (the voltage drop is about 1.0 V), the secondary battery 50
The secondary battery 503 does not become larger than the voltage across both ends of
Cannot be fully charged. Therefore, when the electronic self-winding wrist watch is carried on a daily basis, the secondary battery 503 is
There is a problem that the electronic self-winding wrist watch frequently stops when the charging of the battery does not catch up with the power consumption.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a power generation circuit of an electronic self-winding wristwatch having high power generation efficiency.

[0006]

A speed increasing train wheel engaged with the rotating weight and a permanent magnet engaged with the speed increasing train of a wristwatch driven by a power source generated by rotating a rotary weight to generate electric power. In a generator comprising a rotor consisting of, a stator coupled to the rotor, and a coil fixed to the stator, the generator of the wristwatch has a generator coil and a rotor-generated back electromotive force detection coil. .

The generator coil of the wristwatch generator is connected to a generator circuit, and the generator circuit has a transistor connecting the secondary battery and the generator coil, and the transistor detects the rotor-generated back electromotive voltage. ON / OFF based on the rotor generated back electromotive force detection signal generated by the coil
And forming a rectifying circuit.

The rectifier circuit formed by the transistors is a full-wave rectifier circuit.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. The coil structure of the generator of the present invention will be described. FIG. 1 is a plan view showing a generator of the present invention. 2 is a power generation circuit diagram of the present invention, and FIG. 3 is an ON / OFF table of transistors.

As shown in FIG. 1, a generator 101 includes a rotor 1 composed of two-pole permanent magnets 103 engaging with a speed increasing train wheel.
02, a stator 104 coupled to the rotor 102,
The coil 105 is fixed to the stator 104. The coil 105 is a rotor-generated back electromotive force detection coil 1 for detecting a back electromotive voltage generated by rotation of the generator coil 106 and the rotor 102 wound inside thereof.
07. The rotor-generated back electromotive force detection coil may be wound outside the generator coil 106, but it is easier to detect the back electromotive voltage when wound inside. Details of the back electromotive force generated by the rotor are already filed by the applicant of the present application, which is JP-A-6-23.
It is disclosed in Japanese Patent No. 5777.

Next, the power generation circuit of the present invention will be described with reference to FIG. The power generation circuit 201 includes a P-type MOS transistor Tr1 and a P-type MOS transistor Tr2 (hereinafter
(Abbreviated as transistors Tr1 and Tr2), diodes 207 and 208, a secondary battery 204 connected to each transistor and the diode, an auxiliary capacitor 206 for quickly moving the clock circuit 205 at the start of charging of the secondary battery 204, Secondary battery 204 and the auxiliary capacitor 206
It is composed of a P-type MOS transistor Tr3 and a diode 219, 220 for switching the connection of. The diode 2
The diode 20 has the diode 207 and is not necessarily required.

The output circuit of the rotor-generated back electromotive force detection coil 107 includes an amplifier 209 for amplifying the back electromotive force generated in the rotor-generated back electromotive force detection coil 107, and the amplifier 20.
The sine-wave output of the comparator 211 that detects the positive / negative of the sine-wave output signal 210 of 9 and outputs the rotor-generated back electromotive force detection signal 212 that controls ON / OFF of the transistors Tr1 and Tr2 to the selector 217 A window comparator 214 that outputs an output signal 215 that becomes outputs H and L to the selector 217 depending on whether the signal 210 enters the window 213 or not, and H and L of the output signal 215 of the window comparator 214.
The selector 217 is configured to select one of the output signal 212 of the comparator 211 and the H signal 216 which are input signals based on the above, and output the output signals Q1 and Q2 to the gates of the transistors Tr1 and Tr2, respectively.

Next, the operation will be described with reference to FIG. First, at the start of charging the secondary battery 204, the auxiliary capacitor 20 is quickly passed through the diodes 219 and 220.
6 is charged and activates the clock circuit 205.

Next, due to the positive counter electromotive voltage generated in the magneto coil 106, a generated current 202 is generated in the magneto coil 106. A positive rotor-generated counter-electromotive voltage that differs only in magnitude from the counter-electromotive voltage generated in the generator coil 106 is also generated in the rotor-generated counter-electromotive voltage coil 107. The positive rotor-generated back electromotive force voltage is amplified by the amplifier 209 and becomes the output signal 210. The comparator 211 outputs the rotor generated back electromotive force voltage detection signal 212 of output H, which is input to the selector 217. On the other hand, the output signal 210 of the amplifier is input to the window comparator 214 and becomes H output signal 215 when it does not enter the window 213 and L output when it enters the window 213, and becomes input φ of the selector 217. As shown in the transistor ON / OFF table in FIG. 3, the selector input φ is H
Since the selector outputs Q1 and Q2 are L and H, and the gate inputs of the transistors Tr1 and Tr2 are L and H, respectively, the transistors Tr1 and Tr2 are turned ON and OFF, respectively, and the generated current 202 is passed through the transistor Tr1. , The secondary battery 204 is charged. Here, when the charging voltage of the secondary battery 204 is larger than the positive counter electromotive voltage generated in the generator coil 106, the generated current 2
Even if 02 is allowed to flow from the secondary battery 204 to the power generation coil 106, the secondary battery 204 is blocked by the diode 207, so that the secondary battery 204 is not discharged. When the selector input φ is L, the selector outputs Q1 and Q2 are both H
Therefore, the transistors Tr1 and Tr2 are turned off, and the generated current 202 is not generated.

Next, when the counter electromotive voltage generated in the power generating coil 106 becomes negative, a power generating current 203 is generated in the power generating coil 106. In the rotor-generated back electromotive force coil 107, a negative rotor-generated back electromotive voltage whose magnitude is different from that of the back electromotive force generated in the generator coil 106 is also generated. The negative rotor-generated back electromotive force voltage is amplified by the amplifier 209 and becomes the output signal 210. The comparator 211 turns the rotor-generated back electromotive force detection signal 212 of the output L into the selector 217. On the other hand, the output signal 210 of the amplifier is input to the window comparator 214 and becomes the output signal 215 of H when it does not enter the window 213 and L when it enters the window 213 and becomes the input φ of the selector 217. As shown in the transistor ON / OFF table in FIG. 3, the selector input φ is H
Since the selector outputs Q1 and Q2 are H and L, and the gate inputs of the transistors Tr1 and Tr2 are H and L, respectively, the transistors Tr1 and Tr2 are turned OFF and ON, respectively, and the generated current 203 passes through the transistor Tr2. , The secondary battery 204 is charged. Here, when the charging voltage of the secondary battery 204 is larger than the negative counter electromotive voltage generated in the magneto coil 106, the generated current 2
Even if 03 is allowed to flow from the secondary battery 204 to the power generation coil 106, the secondary battery 204 is blocked by the diode 208, so that the secondary battery 204 is not discharged.

When the selector input φ is L, the selector outputs Q1 and Q2 both become H, the transistors Tr1 and Tr2 are turned off, and the generated current 203 does not occur. In addition, since the rotary weight 403 is stationary or slowly rotating, the amplifier output signal 210
Has entered the window 213 and the window comparator output signal 215 becomes L, the selector output Q
Both 1 and Q2 become H, and transistors Tr1 and Tr2
2 is turned off, and the secondary battery 204 is not charged.

Since the sources of the transistors Tr1 and Tr2 are not connected to the substrate, diodes D1 and D2 are formed between the sources and the substrate as shown in FIG. The charging currents 202 and 203 are T
From r1 to Tr2 when r2 is OFF, or when Tr1 is OFF and Tr2 is ON, Tr2
To short-circuit from Tr1 to Tr1 without flowing, full-wave rectification is performed by the rectification circuit 218 formed of the transistors Tr1 and Tr2 and the diodes 207 and 208, and the secondary battery 204 is sequentially charged.

Next, the drive signal from the clock circuit 205 driven by the auxiliary capacitor 206 turns on Tr3.
Then, it is confirmed whether the voltage across the secondary battery 204 is equal to or higher than a predetermined voltage. If the voltage across the secondary battery is equal to or higher than the predetermined voltage, Tr3 is continuously turned on, and the timepiece is powered by the secondary battery 204. The circuit 205 is driven.

Since the rotary weight 403 does not rotate sufficiently in the daily slight movements of the arm, the generator coil 1
The back electromotive force generated in 06 is small. Further, the back electromotive force is lowered due to the voltage drop due to the on-resistance of the transistor and the voltage drop due to the diode (the voltage drop is about 0.5 V for the voltage drop due to the diode, and the voltage drop due to the diode is Smaller than 1V), still the secondary battery 204
The secondary battery 204 can be charged with a voltage higher than the voltage across both ends. Therefore, in the daily carrying of the electronic self-winding watch, the charging power of the secondary battery 204 does not fall below the power consumption, so the electronic self-winding watch does not stop.

[0020]

As shown by the above detailed description, the power generation circuit 201 of the present invention is operated by the rotor position detection signal 212 generated by the rotor position detection coil 107.
The full-wave rectification of the generated current by the rectifier circuit 218 formed of N / OFF transistors has the effect of efficiently generating power even with a slight arm swing motion.

[Brief description of drawings]

FIG. 1 is a plan view of a generator according to the present invention.

FIG. 2 is a power generation circuit diagram of the present invention.

FIG. 3 is an ON / OFF table of transistors.

FIG. 4 is a plan view of a conventional generator.

FIG. 5 is a conventional power generation circuit.

[Explanation of symbols]

 106 Generator coil 107 Rotor generated counter electromotive voltage detection coil 204 Secondary battery 206 Auxiliary capacitor 209 Amplifier 211 Comparator 214 Window comparator 217 Selector 218 Rectifier circuit Tr1, Tr2, Tr3 P-type MOS transistor

Claims (3)

[Claims] 1. A wristwatch driven by a power source generated by rotating a rotary weight to generate electric power, and a speed increasing wheel train engaged with the rotary weight, and a rotor formed of a permanent magnet engaged with the speed increasing wheel train. ,
An electronic self-winding wristwatch characterized by comprising a stator coupled to the rotor and a coil fixed to the stator, wherein the wristwatch generator has a generator coil and a rotor-generated back electromotive force detection coil. Power generation circuit. 2. The generator coil of the wristwatch generator is connected to a generator circuit, and the generator circuit has a transistor for connecting a secondary battery and the generator coil, the transistor being the counter electromotive voltage generated by the rotor. ON / OFF based on the rotor generated back electromotive force detection signal generated by the detection coil,
The power generating circuit for an electronic self-winding wristwatch according to claim 1, wherein a rectifying circuit is formed. 3. The rectifier circuit formed by the transistor is a full-wave rectifier circuit.
Power generation circuit for the electronic self-winding wrist watch described.