摘要:
Using an oscillating unit (601) that can start oscillation with a low voltage, an oscillation signal (S1) of the oscillating unit (601) is amplified via a waveform shaping unit (603), and is fed to a boosting control unit (105). A boosting unit (103) is caused to perform a boosting behavior by a boosting clock (Sa) with the same frequency as an oscillation frequency of the oscillation signal (S1) just after the oscillating unit (601) starts. Thereby, a whole electronic timepiece (100) can be self-actuated, even if a generation voltage is low. Further, the oscillating unit (601) is constituted such that a operating current always becomes constant. Thereby, the electronic timepiece can be provided with an electricity-generating unit (101) such as a solar cell with a one-stage constitution having a low open voltage.
摘要:
An oscillator (601) capable of oscillation-starting at low voltage is used, an oscillation signal (S1) of this oscillator (601) is amplified via a waveform shaping unit (603) for feeding to a boosting control unit (105). Immediately after starting the oscillator (601), a boosting unit (103) is kept boosting-operated by a boosting clock (Sa) having the same frequency as the oscillating frequency of the oscillation signal (S1). This allows the entire electronic clock (100) to self-start despite a low generation voltage. In addition, since the oscillator (601) is so constructed as to always provide a constant operating current, a power generation unit (101) such as one-stage-construction solar cell low in open voltage can be provided.
摘要:
In making a change from a first state in which an electric charge is being transferred from a secondary power source of large capacity to an auxiliary capacitor through a voltage step-up/down circuit with a step-up/down ratio M' (which is a positive real number other than 1) to a second state in which the secondary power source of large capacity and the auxiliary capacitor are directly electrically connected to each other, the electric energy is transferred from the secondary power source of large capacity to the auxiliary capacitor through the step-up/down circuit in a non-step-up/down state with a step-up/down ratio M = 1, so that the potential difference between the secondary power source of large capacity and the auxiliary capacitor is less than a predetermined potential difference. Therefore, there is no possibility of incurring a sharp power source voltage variation due to a change in step-up ratio, so that malfunction of the electronic apparatus that accompanies a sharp voltage variation of the voltage source can be prevented.
摘要:
In the transition from a state in which charge is being transferred from a large-capacitance secondary power supply to an auxiliary capacitor through a step-up/down circuit by a step-up/down multiplying factor M' (M' is a positive real number excluding one) to a state in which the large-capacitance secondary power supply and the auxiliary capacitor are electrically directly coupled, the electrical energy is transferred from the large-capacitance secondary power supply to the auxiliary capacitor through the step-up/down circuit by a step-up/down multiplying factor M = 1 in a non-stepping-up/down state. A potential difference between the large-capacitance secondary power supply and the auxiliary capacitor is less than a predetermined potential difference. Since a sudden variation in a power supply voltage due to changing the step-up/down multiplying factor is prevented, malfunctioning in an electronic apparatus resulting from the sudden variation in the power supply voltage is prevented.
摘要:
The present invention relates to a compact and thin electronic control timepiece having a long lasting time for indicating highly accurate time. The flow of an AC electromotive force (102) induced in a coil in a generator (3) powered by a power spring (1) is supplied to a step-up circuit (15) in an IC (11). The step-up circuit (15) boosts the rectified electromotive force (102) doubling to charge in a smoothing capacitor (4) as storage power. A step-up control circuit (16) generates a step-up control signal for controlling the step-up operation of the step-up circuit (15). A cycle comparing circuit (8) compares a reference cycle signal from an oscillation circuit (7) and a detected cycle signal (105) synchronized with the rotational cycle of the generator (3), generates a cycle correction signal (106) for eliminating a time difference between both signals, and outputs the signal to a load control circuit (5). The load control circuit (5) in turn changes a load current (107) on the generator (3) by appropriately selecting a load resistor for changing switching elements within an internal circuit, controls the amount of an electromagnetic brake corresponding to a current amount (107) flowing through the load resistor and thereby governs the speed of the rotation cycle of the generator (3).
摘要:
An oscillator (601) capable of oscillation-starting at low voltage is used, an oscillation signal (S1) of this oscillator (601) is amplified via a waveform shaping unit (603) for feeding to a boosting control unit (105). Immediately after starting the oscillator (601), a boosting unit (103) is kept boosting-operated by a boosting clock (Sa) having the same frequency as the oscillating frequency of the oscillation signal (S1). This allows the entire electronic clock (100) to self-start despite a low generation voltage. In addition, since the oscillator (601) is so constructed as to always provide a constant operating current, a power generation unit (101) such as one-stage-construction solar cell low in open voltage can be provided.
摘要:
The present invention relates to a compact and thin electronic control timepiece having a long lasting time for indicating highly accurate time. The flow of an AC electromotive force (102) induced in a coil in a generator (3) powered by a power spring (1) is supplied to a step-up circuit (15) in an IC (11). The step-up circuit (15) boosts the rectified electromotive force (102) doubling to charge in a smoothing capacitor (4) as storage power. A step-up control circuit (16) generates a step-up control signal for controlling the step-up operation of the step-up circuit (15). A cycle comparing circuit (8) compares a reference cycle signal from an oscillation circuit (7) and a detected cycle signal (105) synchronized with the rotational cycle of the generator (3), generates a cycle correction signal (106) for eliminating a time difference between both signals, and outputs the signal to a load control circuit (5). The load control circuit (5) in turn changes a load current (107) on the generator (3) by appropriately selecting a load resistor for changing switching elements within an internal circuit, controls the amount of an electromagnetic brake corresponding to a current amount (107) flowing through the load resistor and thereby governs the speed of the rotation cycle of the generator (3).
摘要:
In making a change from a first state in which an electric charge is being transferred from a secondary power source of large capacity to an auxiliary capacitor through a voltage step-up/down circuit with a step-up/down ratio M' (which is a positive real number other than 1) to a second state in which the secondary power source of large capacity and the auxiliary capacitor are directly electrically connected to each other, the electric energy is transferred from the secondary power source of large capacity to the auxiliary capacitor through the step-up/down circuit in a non-step-up/down state with a step-up/down ratio M = 1, so that the potential difference between the secondary power source of large capacity and the auxiliary capacitor is less than a predetermined potential difference. Therefore, there is no possibility of incurring a sharp power source voltage variation due to a change in step-up ratio, so that malfunction of the electronic apparatus that accompanies a sharp voltage variation of the voltage source can be prevented.
摘要:
Disclosed is a charge pump based power supply for use with low voltage dynamic random access memory (DRAM) including a charge pump and a non-overlapping clock signal generator. The charge pump comprises two pump cascades coupled in parallel. Each pump cascade includes a plurality of pump stages connected serially between a supply voltage and an output node. Adjacent stages of each cascade are clocked on opposite phases of the system clock signal. The charge pump drives an output node on the rising and falling edge of the system clock signal. A non-overlapping clock signal generator comprises a charge sharing transistor, controlled by an equalization pulse generated by the outputs of a latch, which equalizes the non-overlapping output clock signals through charge sharing during the non-overlap period between phases of the system clock. The non-overlapping clock signal generator further comprises a transmission gate included to ensure equalization of the non-overlap period.