CN213693480U

CN213693480U - High-efficiency energy-saving frequency-conversion voltage-regulation energy-recovery type electronic load device

Info

Publication number: CN213693480U
Application number: CN202022937775.5U
Authority: CN
Inventors: 庹绍武
Original assignee: Shenzhen Baihuirong Chuangguang Electromechanical Technology Co ltd
Current assignee: Shenzhen Baihuirong Chuangguang Electromechanical Technology Co ltd
Priority date: 2020-12-10
Filing date: 2020-12-10
Publication date: 2021-07-13
Anticipated expiration: 2030-12-10

Abstract

An energy-efficient frequency conversion voltage regulation energy-recovery type electronic load device relates to the technical field of energy-recovery type electronic load devices. The technical deficiencies of inconvenient installation and use, poor reliability, overhigh production cost and the like of the prior energy-recovery electronic load device product technology are solved, comprising: the device comprises a sampling circuit module, a BOOST booster circuit, a quasi-resonance push-pull circuit and a microprocessor; the quasi-resonance push-pull circuit carries out secondary boosting on the boost circuit through the push-pull transformer, the resonance inductor and the resonance capacitor which are connected in series with the secondary side of the push-pull transformer, and outputs the boost circuit after rectification. And a feed circulation mode is changed, grid-connected operation is changed into off-grid operation, and output voltage is not merged into a power grid any more, so that the reliability of the product is greatly improved. An input end voltage regulating transformer and an output end isolating transformer are eliminated, so that the production cost of the product is reduced. Due to the change of the operation mode, the structure of the product is simplified, thereby facilitating the installation, debugging and use of the product.

Description

High-efficiency energy-saving frequency-conversion voltage-regulation energy-recovery type electronic load device

Technical Field

The utility model relates to a resilience formula electronic load device technical field.

Background

An electronic load is a device that consumes electrical energy by means of the dissipated power of a power tube by controlling the amount of conduction (magnitude of the quantum duty cycle) of an internal power (MOSFET) or transistor. The load current detection circuit can accurately detect load voltage, accurately adjust load current and simultaneously realize the short circuit of a simulation load, wherein the simulation load is inductive resistance and capacitance, and the rise time of the capacitive load current. Debugging detection of a general switching power supply is indispensable.

The existing energy-returning type electronic load device product technology has the following defects: 1. the installation and the use are inconvenient; 2. the reliability is poor; 3. the production cost is too high. Specifically, the reason for inconvenient installation and use is that the input end and the output end of the product are both regulated and isolated by adopting high-power transformers, so that the wiring is complex and the inconvenience is brought to the installation and the use. 2. The reason for the poor reliability is that since the output of the product is incorporated into the power grid, the phase of the output voltage and the phase of the power grid must be strictly synchronized during use, otherwise product damage may occur. 3. The reason for the excessive production cost is that the product forms a closed loop through the power grid, and the cost of the input and output synchronization and isolation device accounts for about 1/3 of the product.

SUMMERY OF THE UTILITY MODEL

To sum up, the utility model discloses an it is not enough that installation, use inconvenience, the reliability is poor and manufacturing cost is too high that current resilience formula electronic load device product technology exists to solve, and provide an energy-efficient frequency conversion pressure regulating resilience formula electronic load device.

For solving the technical problem of the utility model, the technical scheme of adoption is:

the utility model provides an energy-efficient frequency conversion voltage regulation energy recovery formula electronic load device which characterized in that the device including: the device comprises a sampling circuit module, a BOOST booster circuit, a quasi-resonance push-pull circuit and a microprocessor; wherein the content of the first and second substances,

the sampling circuit module is used for sampling input current and voltage of the system and transmitting data to the upper computer through the microprocessor;

the BOOST circuit is used for controlling the switching on and off of the switching tube, finishing the first-stage boosting through the superposition of the discharge voltage of the energy storage inductor and the input voltage of the system, and providing the input voltage for the quasi-resonance push-pull circuit;

the quasi-resonance push-pull circuit carries out secondary boosting on the input voltage provided by the boost circuit through the push-pull transformer and a secondary resonance inductor and a resonance capacitor which are connected in series with the push-pull transformer, and outputs the input voltage after rectification;

and the microprocessor is used for driving a switching tube of the BOOST circuit to be switched on and off through the BOOST control module, driving a push-pull transformer of the quasi-resonance push-pull circuit through the isolation control module, and adjusting and controlling a second-stage BOOST value of the quasi-resonance push-pull circuit.

As the utility model discloses do the technical scheme who further restricts including:

the BOOST control module adopts a TL494 type fixed frequency pulse width modulation circuit.

The microprocessor is connected with a mainboard address distribution circuit and a photoelectric isolation communication circuit, and signal transmission is carried out between the microprocessor and the upper computer through a communication circuit module consisting of the mainboard address distribution circuit and the photoelectric isolation communication circuit.

The isolation control module also adopts a TL494 type fixed frequency pulse width modulation circuit.

The BOOST circuit comprises an inductor L1, an MOS tube Q1, a diode D3 and a capacitor C2; the inductor L1 is connected in series with the diode D3, the MOS transistor Q1 is connected between the common end of the inductor L1 and the diode D3 and the ground, and the capacitor C2 is connected between the output end of the diode D3 and the ground; and a first-stage voltage sampling circuit is also arranged at the output end of the BOOST circuit and provides a first-stage voltage feedback signal for the BOOST control module.

The quasi-resonance push-pull circuit is composed of an MOS tube Q2, an MOS tube Q3, a push-pull transformer T1, a resonance inductor L2 and a resonance capacitor C3, the MOS tube Q2 and the MOS tube Q3 control the on-off of two primary windings of the push-pull transformer T1 respectively, and a secondary winding of the push-pull transformer T1 is connected with the resonance inductor L2 and the resonance capacitor C3 in series for output.

The utility model has the advantages that: 1. and a feed circulation mode is changed, grid-connected operation is changed into off-grid operation, and output voltage is not merged into a power grid any more, so that the reliability of the product is greatly improved. 2. An input end voltage regulating transformer and an output end isolating transformer are eliminated, so that the production cost of the product is reduced. 3. Due to the change of the operation mode, the structure of the product is simplified, thereby facilitating the installation, debugging and use of the product.

Drawings

Fig. 1 is a schematic diagram of the circuit principle of the present invention.

Detailed Description

The structure of the present invention will be further described with reference to the accompanying drawings and preferred embodiments of the present invention.

Referring to fig. 1, the invention discloses an efficient energy-saving frequency-conversion voltage-regulation energy-recovery type electronic load device, which is characterized by comprising: the circuit comprises a sampling circuit module, a BOOST booster circuit, a quasi-resonance push-pull circuit and a microprocessor.

The sampling circuit module is used for sampling input current and voltage of the system and transmitting data to the upper computer through the microprocessor; in this embodiment, the sampling circuit module specifically samples the input voltages of the two sets of input power supplies connected in series through the resistor R1, the resistor R2, the resistor R3, and the resistor R4.

The BOOST circuit is used for controlling the switching on and off of the switching tube, finishing the first-stage boosting through the superposition of the discharge voltage of the energy storage inductor and the input voltage of the system, and providing the input voltage for the quasi-resonance push-pull circuit; BOOST circuits, known in the english name as "the BOOST converter", or step-up converter ", are switching DC BOOST circuits that convert DC power to another fixed or adjustable voltage DC power, also known as DC-DC converters (DC/dcconverters). By on-off control of the power electronics, a dc voltage is intermittently applied to the load, and the average value of the output voltage is varied by varying the duty cycle. The BOOST circuit in the embodiment specifically comprises an inductor L1, a MOS transistor Q1, a diode D3, and a capacitor C2; the inductor L1 is connected in series with the diode D3, the MOS transistor Q1 is connected between the common end of the inductor L1 and the diode D3 and the ground, and the capacitor C2 is connected between the output end of the diode D3 and the ground; and a first-stage voltage sampling circuit is also arranged at the output end of the BOOST circuit and provides a first-stage voltage feedback signal for the BOOST control module. The working principle is as follows: when the MOS transistor Q1 conducts the inductor L1 and charges, the inductor L1 is grounded via the resistor R5, the input voltage flows through the inductor L1, the electric energy is converted into magnetic energy, and at this time, the diode D3 prevents the capacitor C2 from discharging to the ground; since the input is dc, the current in the inductor L1 increases linearly at a certain rate, and as the inductor current increases, some energy is stored in the inductor. When the MOS tube Q1 is disconnected with the inductor L1 to discharge, due to the current maintaining characteristic of the inductor L1, the current flowing through the inductor L1 does not immediately become 0, but slowly becomes 0 from the value after charging is finished, because the original MOS tube Q1 is disconnected, the inductor L1 starts to charge the capacitor C2 through the diode D3, the voltage at the two ends of the capacitor C2 rises, the process is repeated continuously, the voltage higher than the input voltage can be obtained at the two ends of the capacitor C2, if the capacity of the capacitor C2 is large enough, a continuous current can be maintained at the output end in the discharging process, and therefore first-stage boosting is achieved.

The quasi-resonance push-pull circuit carries out secondary boosting on the input voltage provided by the boost circuit through the push-pull transformer and a secondary resonance inductor and a resonance capacitor which are connected in series with the push-pull transformer, and outputs the input voltage after rectification; the quasi-resonance push-pull circuit can be specifically composed of an MOS tube Q2, an MOS tube Q3, a push-pull transformer T1, a resonance inductor L2 and a resonance capacitor C3, the MOS tube Q2 and the MOS tube Q3 are used for controlling the on-off of two primary windings of the push-pull transformer T1 respectively, and a secondary winding of the push-pull transformer T1 is connected with the resonance inductor L2 and the resonance capacitor C3 in series for output. The diode D4, the diode D5, the diode D6, the diode D7, the capacitor C4 and the capacitor C5 form a rectifying and filtering circuit. The high-voltage power supply output by the rectifying and filtering circuit is matched with a single-phase DC/AC conversion device to form a complete set of high-efficiency energy-saving frequency-conversion voltage-regulation energy-return type electronic load device product.

And the microprocessor is used for driving a switching tube of the BOOST circuit to be switched on and off through the BOOST control module, driving a push-pull transformer of the quasi-resonance push-pull circuit through the isolation control module, and adjusting and controlling a second-stage BOOST value of the quasi-resonance push-pull circuit. The BOOST control module adopts a TL494 type fixed frequency pulse width modulation circuit. The isolation control module also adopts a TL494 type fixed frequency pulse width modulation circuit. The microprocessor is connected with a mainboard address distribution circuit and a photoelectric isolation communication circuit, and signal transmission is carried out between the microprocessor and the upper computer through a communication circuit module consisting of the mainboard address distribution circuit and the photoelectric isolation communication circuit.

To sum up, the utility model discloses the sampling circuit module samples the input current, the voltage of system, gives the host computer with data through microprocessor. A complete DC/DC voltage regulation system module is formed by two stages of voltage regulation circuits, and stable and reliable electric energy is provided for a rear-stage single-phase DC/AC conversion device, so that reliable open-loop operation of the system is ensured. The communication circuit module is responsible for signal transmission among the functional modules, the mainboard address distribution circuit is used for carrying out communication coordination on other units, and the photoelectric isolation communication circuit is adopted to ensure that each unit is completely isolated and operates independently. And a grid-connected feeding mode is changed, the single-phase DC/AC conversion device provides energy to perform off-grid feeding circulating operation, and the output voltage is not merged into a power grid.

Claims

1. The utility model provides an energy-efficient frequency conversion voltage regulation energy recovery formula electronic load device which characterized in that the device including: the device comprises a sampling circuit module, a BOOST booster circuit, a quasi-resonance push-pull circuit and a microprocessor; wherein the content of the first and second substances,

2. The high-efficiency energy-saving frequency-conversion voltage-regulation energy-recovery type electronic load device according to claim 1, characterized in that: the BOOST control module adopts a TL494 type fixed frequency pulse width modulation circuit.

3. The high-efficiency energy-saving frequency-conversion voltage-regulation energy-recovery type electronic load device according to claim 1, characterized in that: the microprocessor is connected with a mainboard address distribution circuit and a photoelectric isolation communication circuit, and signal transmission is carried out between the microprocessor and the upper computer through a communication circuit module consisting of the mainboard address distribution circuit and the photoelectric isolation communication circuit.

4. The high-efficiency energy-saving frequency-conversion voltage-regulation energy-recovery type electronic load device according to claim 1, characterized in that: the isolation control module also adopts a TL494 type fixed frequency pulse width modulation circuit.

5. The high-efficiency energy-saving frequency-conversion voltage-regulation energy-recovery type electronic load device according to claim 1, characterized in that: the BOOST circuit comprises an inductor L1, an MOS tube Q1, a diode D3 and a capacitor C2; the inductor L1 is connected in series with the diode D3, the MOS transistor Q1 is connected between the common end of the inductor L1 and the diode D3 and the ground, and the capacitor C2 is connected between the output end of the diode D3 and the ground; and a first-stage voltage sampling circuit is also arranged at the output end of the BOOST circuit and provides a first-stage voltage feedback signal for the BOOST control module.

6. The high-efficiency energy-saving frequency-conversion voltage-regulation energy-recovery type electronic load device according to claim 1, characterized in that: the quasi-resonance push-pull circuit is composed of an MOS tube Q2, an MOS tube Q3, a push-pull transformer T1, a resonance inductor L2 and a resonance capacitor C3, the MOS tube Q2 and the MOS tube Q3 control the on-off of two primary windings of the push-pull transformer T1 respectively, and a secondary winding of the push-pull transformer T1 is connected with the resonance inductor L2 and the resonance capacitor C3 in series for output.