Showing papers on "Charge pump published in 1980"

Charge-Pump Phase-Lock Loops

Abstract: Phase/frequency detectors deliver output in the form of three-state, digital logic. Charge pumps are utilized to convert the timed logic levels into analog quantities for controlling the locked oscillators. This paper analyzes typical charge-pump circuits, identifies salient features, and provides equations and graphs for the design engineer.

Electrostatic air purifier

Abstract: A housing includes a removable top cover and encloses a removable electrostatic precipitating unit formed by a tandem arrangement of two cells each including parallel spaced collecting plates preceded by interspaced particle charging wires or elements. An air circulating fan is enclosed within the housing and is driven by a low voltage two speed DC motor. A first converter provides for converting a high voltage AC power supply to the low voltage DC power supply for the fan, and a second converter provides for converting the low voltage DC power to a DC power supply of several thousand volts for operating the electrostatic precipitating unit. Means are also provided for by-passing the first converter and for operating the fan and the electrostatic precipitating unit from a low voltage DC power supply.

Two terminal Hall-sensor

Abstract: An integrated circuit includes a Hall-element, a voltage regulator, and a threshold detector. DC power is supplied through a pair of terminals that may be connected to a remote DC voltage source. A switchable constant current sink circuit connected across these terminals is turned on and off in response to the two output states of the threshold detector that in turn is responsive to the Hall-element output voltage. Thus the DC current flowing in the two DC supply lines is a predictable large value or small value corresponding to a low and a high magnitude magnetic field at the sensor, even when the supply DC voltage changes over a wide range.

DC to DC converter for line powered modem

Abstract: A DC to DC converter circuit for use in a telephone line powered modem and operative to convert a voltage derived from the telephone line to operating voltages required for modem operation.

High input voltage DC to DC power converter

Abstract: A modular arrangement of DC to DC Power conversion units which permits variation of power handling capability without changing the power control system. The conversion units of the stagger-mode type including two pulse width modulated converter sub-units are separated into two individually powered and controlled units. First units of all converters are connected in one series string across a power source and similarly the second units of all converters are connected in a second series string across the power source. Each unit has a capacitor connected across its power input terminals so that the source voltage is evenly divided between converters. With this configuration only one converter need have its current monitored in order to balance the current between the two strings of converter units. The system includes current and voltage protection features appropriate to a high current and high voltage environment.

Dual charge pump envelope generator

Abstract: A switched capacitor filter is designed utilizing two switched capacitor charge pumps connected in series. These two charge pumps operate with different clock frequencies thereby allowing charging of a storage capacitor at a higher frequency, thereby decreasing incremental voltage steps during the charging of the storage capacitor, resulting in the generation of a smoother exponential voltage rise.

DC Transmission control system

Abstract: A DC power transmission control system for a DC line inserted between a pair of converters comprises a transformer provided on the AC side of each of the converters for maintaining constant the no-load voltage on the converter side by tap position control. One of the converters is operated as an inverter for control of the DC voltage. The control angle of the converter operated as the inverter is controlled by a signal associated with, e.g., a DC current as a load. The DC terminal voltages of the converters are made variable, thus reducing the amount of increase in the reactive power of the rectifier under a small load condition.

Substrate bias generation circuit

Abstract: PURPOSE:To decrease the voltage fluctuation and the ripple by installing the oscillator featuring several units of oscillation output of different phases plus the charge pump circuit featuring several input. CONSTITUTION:Oscillator part A comprises the oscillation circuit consisting of capacitors C1 and C2, resistances Q1 and Q4 composed of the equivalent transistors plus each inverter of transistors Q2,Q3, and Q5,Q6 and Q7,Q8 each and the driving circuit comprising transistors Q9-Q14, Q17 and Q18 respectively. Thus the oscillation output featuring the opposite phases to each other are obtained at output terminals O3 and O4. The double-input charge pump circuit consists of the two sets of circuits comprising capacitor C3, transistors Q15 and Q16, capacitor C4 plus transistors Q19 and Q20 each. And the charge pump charges twice load capacitor C5 alternately in one cycle of the oscillator's oscillation, and as a result the cycle charging C5 can be reduced down to 1/2 oscillation cycle.

Tuning control apparatus for a receiver

Abstract: A voltage controlled oscillator (26) which serves as the local oscillator of a tuner, is controlled by a phase locked loop (5) and an automatic frequency control loop (3), both of which are operable to provide a control voltage to the voltage controlled oscillator (26). An analog switch (22) is controlled in such a manner that the phase locked loop (5) provides the control voltage for the voltage controlled oscillator (26) when a station is being selected, and the automatic frequency control loop (3) provides the control voltage when the tuner is receiving a desired broadcasting wave. The automatic frequency control loop (3) includes a frequency discriminator (10). a window comparator (18) and a charge pump (20). The phase locked loop (5) includes frequency dividing means (28. 30) a phase comparator (32) and a charge pump (36). The outputs from the two charge pumps (20, 36) are applied through the analog switch (22) to a common low-pass filter (24) the output of which is applied to the voltage controlled oscillator (26) as the control voltage. The state of the tuner is detected in response to the output of an intermediate frequency amplifier (8) and a signal indicating whether the phase locked loop is in a locked state.

Drive system for a motor

Abstract: Disclosed is a drive system for a motor, wherein a current proportional to a change of a load of a motor is sensed by a sensing resistor. A voltage produced across the sensing resistor controls an electronic switch in a manner that the output DC voltage of a DC - DC converter is used for a motor drive power source at a normal load and yet a DC power source with a higher voltage than the output DC voltage of the DC - DC converter is used therefor at an increased load.

Substrate bias generating circuit

Abstract: PURPOSE:To lead continuously charge out from a substrate by using a multiphase oscillator and then by connecting several different phase output terminals to the substrate via charge pump circuits. CONSTITUTION:Outputs extracted from respective inverters of link oscillator MPOSC composed of inverters of transistors Q11 and Q12, Q21 and Q21... Qn1 and Qn2 have constant phase difference (pi) one another. Those multiphase outputs 1-n are led to substrate SUB via charge pump circuits CP1-CPn. Therefore, since some phases among outputs of multiphase oscillator MPOSC are at a negative potential and the remainder is at a positive potential without fail during periods T1- Tn, the absorption of positive charge from the substrate via charge pump circuits CP1-CPn and the exhaustion of the charge to a power line are continued without interruption.

Dc/dc converter built-in battery system

Abstract: PURPOSE:To obtain a power supply which readily corresponds to the equipment to be used, without varying the type of a battery depending on the kind of the above equipment by enclosing a battery and a DC/DC converter in the battery housing which encloses the specified battery. CONSTITUTION:A battery 1 is housed in a case 3 and an output is taken out of an external electrode 5. A DC/DC converter 2 is also housed in the case 3 and the voltage of the battery 1 is raised. For example, a battery system is constructed so as to take out 9V voltage from the external electrode 5.

Dimmer circuit for fluorescent lamp - conducts phase or pulse width or frequency of DC=AC converter to modify intensity

Abstract: The dimmer circuit includes a rectifier and a dc/ac converter Light intensity is controlled by controlling the dc voltage by phase control or by altering the pulse width of the dc/ac converter by altering the frequency of the dc/ac converter. The dc/ac converter contains a transformer. The resulting voltage peaks are used to trigger the fluorescent lamp. Feedback in the dc/ac converter is used to limit the current in the lamp. Only one extra installation connection with the control member is needed for control. The entire circuit occupies the same space as a conventional ballast inductor.

Voltage control circuit

Abstract: PURPOSE:To extend the control range of a power source voltage by providing a boosting circuit in a circuit which measures two periods of an oscillator, which has an oscillation frequency comparatively stable for environments, and an oscillator, which has an oscillation frequency comparatively unstable for environments, to control the power source voltage. CONSTITUTION:Voltage control circuit 100 is constituted by charge pump circuit 18, capacity 17, transistor Tr16 and boosting circuit 50, and the supply voltage to circuit block 5 which is operated with a low voltage in circuits of a small-size electronic device is controlled by power source 7. A voltage is applied from power source 7 to high-potential side VDD of block 5 directly, and low-potential side VSS1 is connected to low-potential side VSS2 of power source 7 and circuit 18 through Tr16. Means 15 to measure the period relation between an oscillator, whose oscillation frequency is stable for environments, and an oscilator, whose oscillation frequency is comparatively unstable for them, is provided in block 5, and capacity 17 is charged by signals from means 15 to circuit 18 to control the gate of Tr16. Circuit 50 supplies potential VSS3 lower than potential VSS2 to circuit 18, and the gate of Tr16 is controlled by high potential VDD and low potential VSS3 to control the voltage of block 5.

Phase comparator circuit

Abstract: PURPOSE:To decrease the number of elements and thus to simplify the circuit constitution by omitting the inverter circuit for the signals to be delivered to the change pump of the phase comparator circuit used to the PLL circuit. CONSTITUTION:The priority-type 1st FF22 using reference signal Ref as the input of one side plus priority-type 2nd FF21 using signal Ref as well as the output of FF22 as the input are installed to phase comparator circuit 20 which detects the phase difference between the reference signal and the input signal which constitute the PLL circuit. In addition, priority-type 3rd FF24 using input signal Sig for comparison of the phase with Ref as the input of one side is provided along with 4th FF23 using signal Sig as the input of one side plus the output of FF24 used as the input of other side respectively. The state of both reverse P and reverse N are detected, and the outout is applied to the other input of FF22 and 24. For this purpose, NOR gate 25 is provided. Then the phase is compared between signals Ref and Sig, and reverse P of the output of FF21 plus output N of FF23 are supplied to P- and N-type MOSFET27 and 28 of charge pump 26.

Energy saving DC-DC converter circuit

Abstract: An energy saving DC-DC converter circuit is disclosed having two energy efficient means which operate in tandem, an energy conserving means (30, 8, 1) and a voltage doubling means (26). These energy efficient means are applied in combination with elements commonly found in DC-DC converter circuits, namely an AC voltage generator (2), a transformer (3) for stepping up the generated AC voltage, and means (31) for storing the converted DC voltage. The energy conserving means is connected to the DC voltage storage means (31). It comprises a resettable inhibit circuit (1) which cuts off the provision of DC voltage for conversion for a predetermined interval when the output of the converter exceeds a predetermined level. The voltage doubling means is reponsive to outputs of the inhibit circuit (1) of the energy conserving means and the AC voltage generator (2). It provides a phase inverted waveform of the generated AC voltage on one of two leads to the AC voltage step-up transformer (3).

Digital phase comparator

Abstract: PURPOSE:To simplify a circuit and also to prevent locking to an overtone by using a couple of delayed flip-flops (D-FF). CONSTITUTION:Signals A and B applied to 1st and 2nd input terminals 1 and 2 are converted by edge segmentation circuits 3 and 4 into signals C and D, which are supplied to clock terminal CL and reset terminal R of a couple of D-FF circuits 11 and 12. When signal B leads signal A, negative-directional pulse signal H is outputted from output terminal 16 of charge pump circuit 13 and when lagging, on the other hand, negative-directional pulse signal H is generated. Edge segmentation circuits 3 and 4 reduce duty cycles of signals A and B to prevent locking to an overtone.

Frequency synthesizerrtype channel selection device

Abstract: PURPOSE:To prevent unlock by adding a circuit which issues and output in a direction opposite to unlock at an unlock time CONSTITUTION:When a prescaler generates free-run and a tuning voltage is within a free-run range, the voltage at both ends of capacitor C1 becomes power source voltage VDD due to charge pump output 52 Since the drain voltage of FETTr4 is equal to the gate volrage, the potential at point (A) approaches VDD, and therefore, the potential at point (B) rises, and transistor Tr6 is turned on, and the potential at point (F) rises from OV to a value approximating point (B) Then, the voltage at point (H) rises slowly to make diode D3 conductive, and the tuning voltage of line 60 is raised to transfer the tuning voltage from the free-run range to a regular region, thus performing tuning lock