JP7347232B2 - Rectifier circuit and electronic clock - Google Patents

Description

The present invention relates to a rectifier circuit and an electronic timepiece equipped with the rectifier circuit.

Electricity generated by a generator powered by a rotary weight or spring is used to charge a capacitor or other storage device as driving power, eliminating the need for battery replacement and creating electronic watches that are easy to handle and environmentally friendly. Equipment is known. If the electronic timepiece is a wristwatch, the size of the generator is limited and the electromotive force is small, so a rectifier circuit with low power loss and high power conversion efficiency is required.

In view of this point, for example, the inventors of Patent Document 1 have proposed a rectifier circuit for an electronically controlled mechanical timepiece. The rectifier circuit includes two diodes connected in series between a VSS terminal and one of the AC input terminals. As described in this document, the first diode on the VSS terminal side is a silicon diode with a small reverse leakage current, and the second diode on the AC input terminal side is a shot diode with a small forward voltage drop. Power conversion efficiency was increased by using a key barrier diode.

Japanese Patent Application Publication No. 2000-201483

However, the rectifier circuit of Patent Document 1 has room for improvement in terms of manufacturing efficiency and circuit size. Specifically, a part of the rectifier circuit can be integrated into one chip of IC (Integrated Circuit), but since the two diodes become a single element, the mounting process and component cost increase. Furthermore, the circuit size such as the size of the mounting board and the mounting height also increases, which may affect the size of the electronic watch.
Therefore, it is an object of the present invention to provide a rectifier circuit and an electronic timepiece that have high power conversion efficiency, are small in size, and have good manufacturing efficiency.

The rectifier circuit according to the present application includes a first input terminal and a second input terminal, a first output terminal and a second output terminal, and a first switch that connects and connects the first input terminal and the first output terminal. , a second switch that connects and connects the second input terminal and the first output terminal, and the first switch includes a first transistor whose gate is connected to the second input terminal; a second transistor connected in parallel to the first transistor and turned on and off by a control signal; the second switch includes a third transistor whose gate is connected to the first input terminal; a fourth transistor connected in parallel and turned on and off by the control signal; a first diode and a second diode are connected in series between the second output terminal and the first input terminal; The anode of one diode is connected to the second output terminal, the first diode is composed of a diode-connected fifth transistor, and the second diode is composed of a diode-connected sixth transistor, A channel width/channel length ratio of the sixth transistor is larger than a channel width/channel length ratio of the fifth transistor.

The rectifier circuit according to the present application includes a first input terminal and a second input terminal, a first output terminal and a second output terminal, and a first switch that connects and connects the first input terminal and the first output terminal. , a second switch that connects and connects the second input terminal and the first output terminal, and the first switch includes a first transistor whose gate is connected to the second input terminal; a second transistor connected in parallel to the first transistor and turned on and off by a control signal; the second switch includes a third transistor whose gate is connected to the first input terminal; a fourth transistor connected in parallel and turned on and off by the control signal; a first diode and a second diode are connected in series between the second output terminal and the first input terminal; The anode of one diode is connected to the second output terminal, the first diode is composed of a diode-connected fifth transistor, and the second diode is composed of a diode-connected sixth transistor, The threshold voltage of the sixth transistor is lower than the threshold voltage of the fifth transistor.

1 is an external view of an electronic timepiece according to a first embodiment; FIG. Block configuration diagram of an electronic clock. Circuit diagram including a rectifier circuit and a brake circuit. FIG. 3 is a graph diagram showing forward voltages of first and second diodes. The graph figure which shows the reverse direction current of a 1st and 2nd diode. FIG. 3 is a circuit diagram of a peripheral circuit including a rectifier circuit according to a second embodiment.

Embodiment 1
***Overview of electronic clocks***
FIG. 1 is an external view of an electronic timepiece according to a first embodiment. FIG. 2 is a functional block diagram of the electronic timepiece.
The electronic timepiece 200 of this embodiment is an electronically controlled mechanical timepiece that uses a mainspring 5 used in a mechanical timepiece as a power source to drive the pointer section 14, and controls the time by a rotation control section 58 including a crystal oscillator 48. be.

The electronic timepiece 200 includes a mainspring 5, a gear train 7, a pointer section 14, a generator 20, a rotation control section 58, a rectifier circuit 150, a power supply circuit 22, and the like.
The mainspring 5 is a mainspring used in mechanical watches, and is wound with a crown 70.
The speed increasing wheel train 7 is a speed increasing wheel train consisting of a plurality of gears, and transmits the torque of the mainspring 5 to the pointer section 14 connected to the speed increasing wheel train 7 and the generator 20.
The pointer section 14 includes a second hand 14a, a minute hand 14b, and an hour hand 14c. Further, a calendar display section 72 may be provided.

The generator 20 is composed of a rotor, a stator, a coil block (all not shown), etc., and is driven by a mainspring 5 via a speed increasing gear train 7 to generate induced power and supply electrical energy. do. The AC output from the generator 20 is boosted and rectified through the rectifier circuit 150 and charged to the power supply circuit 22 .
The generator 20 includes a brake circuit 120 (FIG. 3) and also functions as a speed governor. Note that the brake circuit 120 will be described later.

The rotation control unit 58 is a control circuit for the brake circuit 120, and includes an oscillation circuit 51, a frequency dividing circuit 52, a rotation detection circuit 53, a brake control circuit 55, and the like.
The oscillation circuit 51 generates a source oscillation signal (32,768 Hz) using the crystal oscillator 48 which is a time standard source, and outputs it to the frequency dividing circuit 52 .

The frequency dividing circuit 52 is a frequency dividing circuit consisting of, for example, 12 stages of flip-flops, and divides the frequency of the source oscillation signal from the oscillation circuit 51 into a predetermined period.
The rotation detection circuit 53 includes a waveform shaping circuit, a mono multivibrator (none of which is shown), and the like. The waveform shaping circuit includes an amplifier, a comparator, and the like, and converts the sine wave of the AC signal input from the generator 20 into a rectangular wave.
The mono-multivibrator functions as a bandpass filter that passes only pulses having a predetermined period or less, and outputs a rotation detection signal FG1 from which noise has been removed.

The brake control circuit 55 includes an up/down counter, a synchronization circuit, a chopper signal generator (none of which is shown), and the like.
The up/down counter receives the rotation detection signal FG1 from the rotation detection circuit 53 and the reference signal fs from the frequency dividing circuit 52, and counts the reference signal fs and the rotation detection signal FG1 and calculates the difference between them. It is now possible to do both at the same time.
The synchronization circuit is composed of flip-flops, AND gates, etc., and uses the divided signal of the oscillation circuit 51 to synchronize the rotation detection signal FG1 with the reference signal fs (8Hz), and also synchronizes each of these signal pulses. Adjust so that they do not overlap.
The chopper signal generation section is composed of a logic circuit, and uses the frequency-divided signal of the oscillation circuit 51 to output the chopper signal CH to the generator 20 (speed governor). In the preferred example, the chopper signals CH are three types of signals with different duty ratios.

The power supply circuit 22 is a capacitor for power supply. The electric power charged by the power supply circuit 22 is used to drive the electronic circuit of the electronic timepiece 200 including the rotation control section 58.

FIG. 3 is a peripheral circuit diagram including a rectifier circuit and a brake circuit.
The brake circuit 120 includes a first switch 121, a second switch 122, and the like. By turning on these two switches simultaneously, the first switch 121 and the second switch 122 are connected to a first input terminal MG1 and a second input terminal to which an alternating current signal (alternating current) generated by the generator 20 is input. Put MG2 into a closed loop state by short-circuiting, etc., and apply the short brake. Note that the first input terminal MG1 is also referred to as a node d, and the second input terminal MG2 is also referred to as a node f.

The first switch 121 includes a first transistor 126 whose gate terminal is connected to the second input terminal MG2, and a second transistor 127 whose gate terminal receives the chopper signal CH as a control signal from the rotation control section 58. , are electrically connected in parallel. The drain terminals of the first transistor 126 and the second transistor 127 are connected to the first input terminal MG1, and the source terminals are connected to the first output terminal 106 of the rectifier circuit 150. Note that the rectifier circuit 150 will be described later. Further, the junction between the source terminal of the first transistor 126 and the source terminal of the second transistor 127 is defined as a node e.

The second switch 122 includes a third transistor 128 whose gate terminal is connected to the first input terminal MG1, and a fourth transistor 129 whose gate terminal receives the chopper signal CH as a control signal from the rotation control section 58. , are electrically connected in parallel. The drain terminals of the third transistor 128 and the fourth transistor 129 are connected to the second input terminal MG2, and the source terminals are connected to the first output terminal 106 of the rectifier circuit 150. Further, the junction between the source terminal of the third transistor 128 and the source terminal of the fourth transistor 129 is defined as a node g.
In a preferred example, the first transistor 126 to the fourth transistor 129 are all P-channel field effect transistors.

In the brake circuit 120 having such a configuration, while the chopper signal CH is at the L level, the second transistor 127 and the fourth transistor 129 are maintained in the on state, the generator 20 is short-circuited, and the brake is applied. Note that by performing brake control using three types of chopper signals with different duty ratios, it is possible to adjust the strength of the braking torque of the brake, and efficient brake control can be performed.
On the other hand, while the chopper signal CH is at the H level, the second transistor 127 and the fourth transistor 129 are maintained in the off state, and the generator 20 is not braked. In this way, the chopper signal CH performs chopping control on the generator 20.

Further, the first transistor 126 is turned on when the polarity of the second input terminal MG2 is "-", and the third transistor 128 is turned on when the polarity of the first input terminal MG1 is "-". That is, among the first transistor 126 and the third transistor 128, one of the first input terminal MG1 and the second input terminal MG2 of the generator 20 connected to the terminal with the polarity "-" is turned on, and the other transistor is turned on. Configured to be turned off. As a result, it also functions as a rectification switch and constitutes a part of the rectification circuit 150.

***Composition of rectifier circuit***
The rectifier circuit 150 includes a first diode 124, a second diode 125, a capacitor 123, and the like, in addition to a first switch 121 and a second switch 122, which also function as rectifier switches. Further, the output terminal on the polarity "+" side (VDD) of the DC power from the rectifier circuit 150 is the first output terminal 106, and the output terminal on the polarity "-" side (VSS) is the second output terminal 107. A power supply circuit 22 made of a capacitor is connected between the first output terminal 106 and the second output terminal 107. Note that the first output terminal 106 is also referred to as a node a, and the second output terminal 107 is also referred to as a node b.

The first diode 124 has an anode terminal connected to the second output terminal 107 and a cathode terminal connected to the anode terminal of the second diode 125. A cathode terminal of the second diode 125 is connected to the first input terminal MG1. That is, the first diode 124 and the second diode 125 are connected in series in this order between the second output terminal 107 and the first input terminal MG1. Further, the junction between the first diode 124 and the second diode 125 is defined as a node c. In a preferred example, diode-connected transistors are used as the first diode 124 and the second diode 125, which will be described in detail later.
The capacitor 123 is a boost capacitor, and one end is connected to the node c, and the other end is connected to the second input terminal MG2.

The brake circuit 120 and the rectifier circuit 150 constitute a simple synchronous step-up chopper rectifier circuit, and the electric charge generated by the generator 20 is charged into the power supply circuit 22. Specifically, when the polarity of the first input terminal MG1 is "-" and the polarity of the second input terminal MG2 is "+", the first transistor 126 is turned off and the third transistor 128 is turned on. As a result, the electric charge of the induced voltage generated in the generator 20 is charged to the step-up capacitor 123 of, for example, 0.1 μF by the circuit of “node f→node c→node d→node f” in FIG. , the power supply circuit 22 is charged by the circuit of "node f→node g→node e→node a→node b→node c→node d". Note that the capacitance of the power supply circuit 22 in a preferred example is 10 μF.

On the other hand, when the polarity of the first input terminal MG1 is "+" and the polarity of the second input terminal MG2 is switched to "-", the first transistor 126 is turned on and the third transistor 128 is turned off. As a result, the induced voltage generated in the generator 20 and the charging voltage of the capacitor 123 are added by the circuit of "capacitor 123 → node f → node d → node e → node a → node b → node c → capacitor 123". The power supply circuit 22 is charged with the applied voltage.
Note that in each state, when both ends of the generator 20 are short-circuited and opened by the chopper signal CH, a high voltage is induced at both ends of the coil, and the power supply circuit 22 is charged by this high charging voltage. Charging efficiency is improved.

***Detailed explanation of the first diode and second diode***
As described above, the first diode 124 and the second diode 125 use diode-connected transistors. Specifically, the first diode 124 is configured as a diode by connecting the gate terminal and source terminal of the fifth transistor 81, which is an N-channel field effect transistor. Similarly, the second diode 125 is configured as a diode by connecting the gate terminal and source terminal of the sixth transistor 82, which is an N-channel field effect transistor.

Here, the reason why the first diode 124 and the second diode 125 are configured using diode-connected transistors is to integrate the brake circuit 120 and the rectifier circuit 150 into one chip of IC (Integrated Circuit). be. Specifically, using a CMOS (Complementary Metal Oxide Semiconductor) process, the brake circuit 120 and rectifier circuit 150, excluding the generator 20, power supply circuit 22, and capacitor 123 in FIG. 3, are integrated into one chip IC. That is, by mounting the generator 20, the power supply circuit 22, and the capacitor 123 on the board on which the IC is mounted, the simple synchronous boost chopper rectifier circuit shown in FIG. 3 can be configured.

In such a rectifier circuit 150, in order to improve charging efficiency, it is desirable that the first diode 124 has a small reverse current, and the second diode 125 preferably has a small forward voltage.
Therefore, the W/L ratio, which is the ratio between the channel width W and the channel length L, is changed between the fifth transistor 81 serving as the first diode 124 and the sixth transistor 82 serving as the second diode 125. Specifically, the W/L ratio of the sixth transistor 82 is made larger than the W/L ratio of the fifth transistor 81. In a preferred example, the channel width W of the fifth transistor 81 is 560 μm, and the channel length L is 0.8 μm. The channel width W of the sixth transistor 82 is 1680 μm, and the channel length L is 0.8 μm. As a result, the W/L ratio of the sixth transistor 82 = 2100 is three times the W/L ratio of the fifth transistor 81 = 700. Note that the ratio is not limited to this, as long as the W/L ratio of the sixth transistor 82 is larger than the W/L ratio of the fifth transistor 81.

FIG. 4A is a graph showing the forward voltage of the first diode 124 and the second diode 125, and FIG. 4B is a graph showing the reverse current. In FIG. 4A, the horizontal axis shows the threshold voltage Vth (V) of the transistor, and the vertical axis shows the forward voltage Vf (V). Note that the forward voltage Vf is defined as a voltage at which a current of 1 mA flows. As shown in the graph, the threshold voltage Vth and the forward voltage Vf have a substantially proportional relationship.
For example, when the threshold voltage Vth is 0.6V, the forward voltage Vf of the first diode 124 is about 0.48V, while the forward voltage Vf of the second diode 125 is about 0.43V. It becomes. In other words, the forward voltage of the second diode 125 formed by the sixth transistor 82 having a large W/L ratio is about 0.5 V lower than that of the first diode 124. Note that the forward voltage Vf of the Schottky diode used in the prior art is 0.3 to 0.5 V, which is approximately the same value.

In FIG. 4B, the horizontal axis represents the threshold voltage Vth (V) of the transistor, and the vertical axis represents the reverse current Ir (nA). As shown in the graph, the threshold voltage Vth and the reverse current Ir have a substantially inversely proportional relationship.
When the threshold voltage Vth is 0.6V, the reverse current Ir of the second diode 125 is approximately 0.2 nA, whereas the reverse current Ir of the first diode 124 is 0.05 nA or less. Therefore, a value approximately equivalent to the reverse current of a conventional silicon diode can be obtained. Note that the threshold voltage Vth=0.6V is a design standard value in a preferred example.

In the above, a case has been described in which the W/L ratio is changed between the fifth transistor 81 and the sixth transistor 82 and the integrated circuit is fabricated. However, the invention is not limited to this, and the sixth transistor 82 is It is sufficient if the W/L ratio of the fifth transistor 81 is larger than that of the fifth transistor 81 . For example, the W/L ratio may be changed by forming a plurality of n-type MOS transistors of the same size in the IC and connecting a predetermined number of them in parallel. Specifically, 56 element transistors each having a channel width W of 40 μm and a channel length L of 0.8 μm are built into the IC. The fifth transistor 81 can have a channel width W of 560 μm by connecting 14 element transistors in parallel. Similarly, the channel width W of the sixth transistor 82 can be set to 1680 μm by connecting 42 element transistors in parallel. Note that the number of element transistors is not limited to 56, but may be as many as necessary to change the W/L ratio.

As described above, the first diode 124 is composed of the diode-connected fifth transistor 81, and the second diode 125 is composed of the diode-connected sixth transistor 82. The W/L ratio of the sixth transistor 82 is larger than the channel W/L ratio of the fifth transistor 81.

According to this configuration, the second diode 125 formed by the sixth transistor 82 having a large W/L ratio has a small forward voltage, and the first diode 124 formed by the fifth transistor 81 having a small W/L ratio has a small reverse current. Become. Therefore, loss of electromotive force caused by the generator 20 can be reduced, and power conversion efficiency can be increased. Further, by configuring the first diode 124 and the second diode 125 by diode connection of transistors, the first transistor 126 to the sixth transistor 82 can be integrated into one integrated circuit. Therefore, two diodes, which were single elements in the prior art, can be integrated into one IC, reducing the number of mounting steps and improving manufacturing efficiency. Furthermore, component costs can also be reduced. Furthermore, circuit size such as mounting board size and mounting height can be reduced.
Therefore, it is possible to provide a rectifier circuit 150 that has high power conversion efficiency, is small in size, and has good manufacturing efficiency.

The rectifier circuit 150 also includes a voltage boosting capacitor 123 connected between the node c and the second input terminal MG2, and a capacitor connected between the first output terminal 106 and the second output terminal 107. It further includes a power supply circuit 22. As a result, the voltage of the capacitor 123 is added to the induced voltage generated by the generator 20, so that the power supply circuit 22 is charged with the boosted voltage.
Therefore, it is possible to provide a highly efficient voltage doubler type rectifier circuit 150 that includes a booster circuit.

The electronic watch 200 also includes a generator 20 that is connected between a first input terminal MG1 and a second input terminal MG2 and outputs an AC signal, a rectifier circuit 150, and a DC power rectified by the rectifier circuit 150. It includes a power supply circuit 22 for storage, a rotation control section 58 that is driven by the DC power of the power supply circuit 22 and outputs a chopper signal CH as a control signal, and a pointer section 14 that is controlled by the rotation control section 58 and displays the time. ing.
Therefore, it is possible to provide an electronic timepiece 200 that is small and has high power conversion efficiency.

Embodiment 2
***Different configurations of first diode and second diode***
FIG. 5 is a peripheral circuit diagram including a rectifier circuit and a brake circuit according to this embodiment, and corresponds to FIG. 3.
The rectifier circuit 151 of this embodiment includes a first diode 134 and a second diode 135 that are different from the first diode 124 and second diode 125 of the first embodiment. The first diode 134 and the second diode 135 have the same electrical characteristics as the first diode 124 and the second diode 125 of the first embodiment, but their manufacturing method is different from that of the first embodiment. Other than this point, the rectifier circuit 150 is the same as the rectifier circuit 150 of the first embodiment.

The first diode 134 and the second diode 135 use diode-connected transistors. Specifically, the first diode 134 is configured as a diode by connecting the gate terminal and source terminal of the fifth transistor 91, which is an N-channel field effect transistor. Similarly, the second diode 135 is configured as a diode by connecting the gate terminal and source terminal of the sixth transistor 92, which is an N-channel field effect transistor.

Here, the channel width and channel length of the fifth transistor 91 and the sixth transistor 92 are the same, and the channel width/channel length ratio of the sixth transistor 92 is the channel width/channel length of the sixth transistor 82 in the first embodiment. However, by adding channel doping to the sixth transistor 92 in the manufacturing process, the threshold voltage Vth is lower than that of the fifth transistor 91. Specifically, in the sixth transistor 92, the threshold voltage Vth is made lower than that of the sixth transistor 82 of the first embodiment by doping the channel with an n-type impurity such as phosphorus, and the forward voltage is made lower than that of the sixth transistor 82 of the first embodiment. The value is equivalent to that of 6 transistors 82. Note that no additional channel doping is performed in the fifth transistor 91.

For example, the fifth transistor 91 and the sixth transistor 92 have the same channel width W of 560 μm and channel length L of 0.8 μm, and channel doping is selectively added to the sixth transistor 92. Note that the dimensions are not limited to this, and it is sufficient if the channel width and channel length of both transistors are the same. As a result, the second diode 135 formed by the sixth transistor 92 has electrical characteristics equivalent to those of the second diode 125 of the first embodiment. Further, the first diode 134 formed by the fifth transistor 91 has the same electrical characteristics as the first diode 124 of the first embodiment. Therefore, the relationship between the forward voltage and reverse current in the first diode 134 and the second diode 135 is equivalent to the relationship between the first diode 124 and the second diode 125 in FIGS. 4A and 4B.

Note that the configuration of the n-type MOS transistor in the IC is such that a fifth transistor 91 and a sixth transistor 92 having the same W/L ratio are fabricated, and channel doping is selectively added to the sixth transistor 92. Alternatively, a predetermined number of element transistors having the same W/L ratio may be built in. In the latter case, additional channel doping may be selectively performed on the plurality of element transistors constituting the sixth transistor 92.

As described above, the threshold voltage of the sixth transistor 92 is lower than the threshold voltage of the fifth transistor 91. Specifically, the fifth transistor 91 and the sixth transistor 92 have the same channel width/channel length (W/L) ratio, but the threshold voltage of the sixth transistor 92 is lowered by additional channel doping.
Since the threshold voltage and the forward voltage are in a substantially proportional relationship, the second diode 135 formed by the sixth transistor 92 whose threshold voltage is lower than that of the fifth transistor 91 has a smaller forward voltage. Further, the relationship between the threshold voltage and the reverse current is similar to that in FIG. Directional current becomes smaller. Therefore, loss of electromotive force caused by the generator 20 can be reduced, and power conversion efficiency can be increased.

Further, the rectifier circuit 151 has the same configuration as the rectifier circuit 150 of the first embodiment except for the method of manufacturing the first diode 134 and the second diode 135.
Therefore, it is possible to provide a rectifier circuit 151 that has high power conversion efficiency, is small in size, and has good manufacturing efficiency. Therefore, it is possible to provide an electronic timepiece 200 that is small and has high power conversion efficiency.

Embodiment 3
***Other application examples***
Although the above embodiment has been described as an example in which the rectifier circuits 150 and 151 are applied to the electronic timepiece 200 using the mainspring 5 as a power source, the present invention is not limited to this configuration. For example, the rectifier circuits 150 and 151 may be applied to various electronic devices, timekeeping devices, and the like that require rectification of an AC signal output from a generator or the like into a DC signal. Even with these configurations, the same effects as those of the above embodiment can be obtained. It is particularly suitable for wristwatches incorporating small generators, portable electronic devices, and timekeeping devices. The mechanical energy source for driving the generator is not limited to a mainspring, but may also be a rubber, a spring, a weight, a fluid such as compressed air, or the like. Even with these configurations, the same effects as those of the above embodiment can be obtained.

In addition, the mechanical energy transmission means for transmitting mechanical energy from a power source such as a mainspring to a generator is not limited to the gear train (gear) as in the above embodiment, but also a friction wheel, a belt (timing belt, etc.) Alternatively, pulleys, chains, sprocket wheels, racks and pinions, cams, etc. may be used. Furthermore, generators are not limited to generators that rotate a rotor to generate electricity through electromagnetic conversion, but also include piezo generators that generate electricity by applying stress to piezoelectric elements (piezo elements), and generators that utilize electrostatic induction phenomena. Other types of generators may also be used. Even with these configurations, the same effects as those of the above embodiment can be obtained.
Furthermore, the time display device is not limited to the pointer section 14, but may be a disk, annular, or arc-shaped device. Furthermore, a digital time display device using a liquid crystal panel or the like may be used.

5... Mainspring, 7... Speed increasing gear train, 14... Pointer section, 20... Generator, 22... Power supply circuit, 48... Crystal oscillator, 51... Oscillation circuit, 53... Rotation detection circuit, 55... Braking control circuit, 58 ...Rotation control unit, 81...Fifth transistor, 82...Sixth transistor, 91...Fifth transistor, 92...Sixth transistor, 106...First output terminal, 107...Second output terminal, 120...Brake circuit, 121... First switch, 122... Second switch, 123... Capacitor, 124... First diode, 125... Second diode, 126... First transistor, 127... Second transistor, 128... Third transistor, 129... Fourth transistor, 134...first diode, 135...second diode, 150...rectifier circuit, 151...rectifier circuit, 200...electronic clock, CH...chopper signal, MG1...first input terminal, MG2...second input terminal.

Claims (6)

a first input terminal and a second input terminal; a first output terminal and a second output terminal; a first switch that connects and connects the first input terminal and the first output terminal; and the second input terminal; a second switch that connects and connects the output terminal to the first output terminal;
The first switch includes a first transistor whose gate is connected to the second input terminal, and a second transistor which is connected in parallel to the first transistor and is turned on and off by a control signal,
The second switch includes a third transistor whose gate is connected to the first input terminal, and a fourth transistor that is connected in parallel to the third transistor and is turned on and off by the control signal,
A first diode and a second diode are connected in series between the second output terminal and the first input terminal,
an anode of the first diode is connected to the second output terminal,
The first diode is composed of a diode-connected fifth transistor, and the second diode is composed of a diode-connected sixth transistor,
A rectifier circuit in which a channel width/channel length ratio of the sixth transistor is larger than a channel width/channel length ratio of the fifth transistor. a first input terminal and a second input terminal; a first output terminal and a second output terminal; a first switch that connects and connects the first input terminal and the first output terminal; and the second input terminal; a second switch that connects and connects the output terminal to the first output terminal;
The first switch includes a first transistor whose gate is connected to the second input terminal, and a second transistor which is connected in parallel to the first transistor and is turned on and off by a control signal,
The second switch includes a third transistor whose gate is connected to the first input terminal, and a fourth transistor that is connected in parallel to the third transistor and is turned on and off by the control signal,
A first diode and a second diode are connected in series between the second output terminal and the first input terminal,
an anode of the first diode is connected to the second output terminal,
The first diode is composed of a diode-connected fifth transistor, and the second diode is composed of a diode-connected sixth transistor,
The threshold voltage of the sixth transistor is lower than the threshold voltage of the fifth transistor. 3. The rectifier circuit according to claim 2, wherein the fifth transistor and the sixth transistor have the same channel width/channel length ratio, and the sixth transistor has a lower threshold voltage due to channel doping. 4. The rectifier circuit according to claim 1, wherein the first to sixth transistors are integrated into one integrated circuit using a CMOS circuit. a boosting capacitor connected between a node between the first diode and the second diode and the second input terminal;
The rectifier circuit according to any one of claims 1 to 4, further comprising a power supply capacitor connected between the first output terminal and the second output terminal. The rectifier circuit according to any one of claims 1 to 5,
a generator connected between the first input terminal and the second input terminal and outputting an alternating current signal;
a power supply circuit that stores DC power rectified by the rectifier circuit;
a rotation control section that is driven by DC power of the power supply circuit and outputs the control signal;
An electronic timepiece, comprising: a pointer section that is controlled by the rotation control section and displays the time.

Images