The invention discloses a zero-cross detection circuit Voltage-withstanding tubes of a sampling circuit are a PMOS (P-channel Metal Oxide Semiconductor) tube and an NMOS (N-channel Metal Oxide Semiconductor) tube, so that the problem of short service life due to high voltage damage can be solved The zero-cross detection circuit also comprises a current bias module; the phenomenon of great errors caused by the influence of channel length modulation effect on the mirror current can be reduced; a current comparator is set into a two-stage current comparator; a cascade device is inserted in a first stage circuit; the gain can be improved, and meanwhile, great oscillation amplitude can be realized; the lead of the zero-cross detection circuit is 48 to 50mA; the stability and the identification sensitivity of a system can be improved; the work efficiency can be improved; and the application value is very high

Zero-cross detection circuit

The invention mainly relates to a voltage conversion circuit realizing automatic power factor correction An interconnection node between an inductive resistor and an inductor is defined as a floating ground node The sampling voltage across the two ends of the inductive resistor is captured between a second end of a main switching tube and the floating ground node After comparing the sampling voltage with a reference voltage and amplifying the sampling voltage, an error amplifier outputs the sampling voltage to a first capacitor The average voltage of the first capacitor and a sawtooth wave output by an oscillator are compared by a pulse width modulation comparator A produced pulse width modulation signal is coupled to a control end of the main switching tube The main switching tube is such set that the on time in each switching cycle is kept constant A more flexible power factor correction PFC technology without an analog multiplier is adopted Moreover, the implementation mode of PFC is simpler, and the stability is better

Voltage conversion circuit realizing automatic power factor correction

The invention discloses a power generating device with wind power and solar energy utilized The power generating device comprises a wind power generating system, a solar energy power generating system, a controller (10) and a storage battery (20) The wind power generating system and the solar energy power generating system are connected with the controller (10), and the controller (10) is connected with the storage battery (20) The controller (10) comprises a DC/DC converting circuit, a power switching tube is additionally arranged on the DC/DC converting circuit on the basis of a traditional BUCK circuit, and the power consumption of the whole circuit becomes small Compared with an independent wind power system and an optoelectronic system, the power generating device has obvious advantages, the complementation characteristics of the solar energy and the wind energy are utilized, the stable total output can be produced, and the system stability and reliability are improved

Power generating device with wind power and solar energy utilized

The invention discloses a battery power supply circuit and a power source with the same. The battery power supply circuit comprises a delay module used to delay the transmission of an input voltage to an input control chip, an input control module used to transmit the input voltage to a voltage control module when a post-stage circuit is in a non-dormant mode, an input filter module used to filter the input voltage transmitted by the input control module to the voltage control module, the voltage control module used to boost the input voltage and output the boosted input voltage to the post-stage circuit through an output filter module when the input voltage transmitted by the input control module is lower than the voltage required by the post-stage circuit, and the output filter module used to filter an output voltage signal output by the voltage control module to the post-stage circuit. By adopting the battery power supply circuit and the power source of the invention, the static loss and standby loss of a booster circuit are reduced, the service time of batteries is prolonged, and the utilization rate of batteries is increased.

Battery power supply circuit and power source with same

The invention provides a sawtooth wave oscillating circuit suitable for a pulse width modulation system The sawtooth wave oscillating circuit comprises a current source module, a threshold voltage module, a stored energy control module and a charge-discharge module, wherein an output end of the current source module is respectively connected to the threshold voltage module and the stored energy control module; an output end of the threshold voltage module is connected to the stored energy control module, an output end of the stored energy control module is connected to the charge-discharge module, the threshold voltage module is used for providing reference voltage for the stored energy control module, and the stored energy control module is used for controlling the charge-discharge state of the charge-discharge module; a sawtooth wave signal output port is connected to the charge-discharge module, and a sawtooth wave signal output by the sawtooth wave signal output port serves as feedback and is input into an input end of the stored energy control module Due to adoption of the technical scheme, the sawtooth wave oscillating circuit has good linearity and is low in production cost; a sawtooth wave voltage signal output by the sawtooth wave oscillating circuit is slightly affected by change of input voltage and operating ambient temperatures, and has good stability and is particularly suitable for a switching power supply pulse width modulation circuit

Sawtooth wave oscillating circuit suitable for pulse width modulation system

The invention provides a current zero crossing detection circuit for a BUCK type synchronous rectification converter. The circuit comprises a working state control circuit, a detection signal conversion circuit and a detection signal comparison circuit. The working state control circuit receives main switch MOS pipe driving signals Vd and outputs control signals Vcol to the detection signal conversion circuit. The detection signal conversion circuit receives zero crossing detection point signals Vz and outputs comparison signals Icop to the detection signal comparison circuit. The detection signal comparison circuit judges whether zero crossing occurs in the detection point signals, and outputs signals Vout to control a synchronous MOS pipe to be opened and closed. When the converter works in an inductive current interruption mode, the current zero crossing detection circuit automatically detects a zero crossing state of an inductive current and timely closes the synchronous MOS pipe to prevent the current from flowing backwards. Through design of the zero crossing detection circuit structure, changes of the environment temperature and a fabrication process corner have extremely small influence on the output signals.

Current zero crossing detection circuit for BUCK type synchronous rectification converter

The utility model discloses a low-power consumption control circuit for a switching power supply standby state, which comprises a switching power supply before-work state detection device, a switching power supply in-work state detection device, a switching power supply input current control device and a circuit power supply device. The low-power consumption control circuit for the switching power supply standby state can automatically detect the working states of the switching power supply and adjust the input current of the switching power supply so as to enable the switching power supply to be in a low-power consumption standby state in the case of no load. According to the low-power consumption control circuit for the switching power supply standby state, the switching power supply before-work state detection device and the power supply after-work detection device are adopted for respectively judging the load states of the switching power supply, on and off of the power supply input end are controlled via an MOS tube, and the control effects are stable and accurate. The low-power consumption control circuit for the switching power supply standby state is divided into four devices for optimal design, the structure of the circuit is simple and clear, and the production cost and the circuit complexity can be effectively reduced.

Low-power consumption control circuit for switching power supply standby state

The utility model provides a sawtooth wave oscillation circuit applied to a pulse width modulation system The sawtooth wave oscillation circuit is composed of a current source module, a threshold voltage module, an energy storage control module, and a charging-discharging module The output terminal of the current source module is respectively connected with the threshold voltage module and the charging-discharging module; the output terminal of the threshold voltage module is connected with the energy storage control module; and the output terminal of the energy storage control module is connected with the charging-discharging module The threshold voltage module provides a reference voltage for the energy storage control module; and the energy storage control module controls the charging and discharging state of the charging-discharging module A sawtooth wave signal output port is connected with the charging-discharging module; and the output sawtooth wave signal used as the feedback is inputted to the input terminal of the energy storage control module On the basis of the technical scheme, the linearity is good; and the production cost is low The outputted sawtooth wave voltage signal is nearly not affected by the input voltage change and the work environment temperature change and the good stability is realized The provided sawtooth wave oscillation circuit is especially suitable for a switching power supply pulse width modulation circuit

Wang Hongling

Papers

Current zero crossing detection circuit for BUCK type synchronous rectification converter

Low-power consumption control circuit for switching power supply standby state

Sawtooth wave oscillation circuit applied to pulse width modulation system

Sawtooth wave oscillating circuit suitable for pulse width modulation system