Digital inversion and charging integrated power supply

Abstract

The utility model relates to the technical field of charging power supplies, in particular to a digital inversion and charging integrated power supply, which comprises a current main loop and a control system matched with the current main loop, and is characterized in that the current main loop comprises a Boost circuit, a Buck circuit, a full-bridge inversion circuit consisting of power switch devices, a metering circuit, a control circuit and a UPS (Uninterrupted Power Supply) circuit; the control system comprises an auxiliary power supply, a cooling fan, a voltage and current monitor and a signal adapter plate; and the control circuit performs logic control programming on the whole circuit by taking a digital signal processor U9 as a core. The utility model has the advantages that under the control of a control system, the inverter power supply is continuously adjustable in a numerical control type output power range, the numerical control type inverter bridge switching frequency range and the numerical control type output square wave pulse width and duty ratio range; under the protection function of the UPS circuit, the battery can directly keep continuous output through inversion when the mains supply is cut off, and the applicability in different application scenes is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to charging power supply technical field especially a digital inverter charging integrated power supply. BACKGROUND

[0002] The power inverter power supply is a backup uninterruptible power supply, which mainly completes the inversion from DC to AC. It can be set as DC main or AC main according to the application occasion, and the switching is controlled by a static switch.

[0003] However, the current power inverter power supply cannot continuously adjust the output power range, switching frequency range, and output square wave pulse width and duty cycle range, resulting in poor practicability. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at solving at least one of the technical defects.

[0005] Therefore, one purpose of the utility model is to provide a digital inverter charging integrated power supply to solve the problems mentioned in the background art and overcome the deficiencies in the prior art.

[0006] In order to achieve the above-mentioned purpose, an embodiment of the utility model provides a digital inverter charging integrated power supply, which comprises a current main circuit and a matching control system thereof. The current main circuit comprises a Boost voltage boosting circuit, a Buck voltage reducing circuit, a full-bridge inverter circuit composed of power switching devices, a metering circuit, a control circuit and a UPS circuit. The control system comprises an auxiliary power supply, a cooling fan, a voltage and current monitor, and a signal adapter plate. The control circuit takes a digital signal processor U9 as the core for logical control programming of the whole circuit. The control circuit outputs in digital form to control the whole circuit.

[0007] According to any one of the above-mentioned schemes, the Boost voltage boosting circuit comprises a transformer, an IGBT half-bridge module, an IGBT driver, a driving resistor R7 and a protection resistor R11.

[0008] According to any one of the above-mentioned schemes, the Buck voltage reducing circuit comprises an inductor, a MOS tube Q3, a diode D3, an electrolytic capacitor C37, a DC-DC power supply chip U11, driving resistors R29 and R67, and a protection resistor C35.

[0009] It is preferred that, according to any of the above solutions, the full-bridge inverter circuit comprises four IGBT modules and driving circuits thereof, the driving circuit comprises driving resistors R4, R13, R62 and R63, protection resistors, diodes and discharge capacitors, the full-bridge inverter circuit is an IGBT full-bridge inverter circuit, and the full-bridge inverter circuit comprises two IGBT half-bridge modules Q6 and Q7 and corresponding two IGBT drivers Q8 and Q9.

[0010] It is preferred that, according to any of the above solutions, the metering circuit comprises a metering chip U23, a DC input chip and a driving resistor R84.

[0011] It is preferred that, according to any of the above solutions, the UPS circuit is configured to charge the storage battery through the charger and attract the self-starting relay in a normal state.

[0012] It is preferred that, according to any of the above solutions, the control system further comprises a touch screen for realizing a control mode, and the touch screen is configured to transmit data with the control board, display grid voltage, display working states of main functional devices of the equipment, digitally control output power, digitally control IGBT switching frequency, digitally control output square wave pulse width and duty cycle and display temperatures of key devices.

[0013] It is preferred that, according to any of the above solutions, the signal adapter board is configured to sample voltage and current signals, control power conversion and distribution, start and stop a fan, sample IGBT temperature signals and realize over-temperature protection, transmit signals with the IGBT driver board and transmit signals with the control board.

[0014] Compared with the prior art, the digital inverter charging integrated power supply has the following advantages and beneficial effects:

[0015] The digital inverter charging integrated power supply can realize continuous adjustment in a numerical control type output power range, a numerical control type inverter bridge switching frequency range and a numerical control type output square wave pulse width and duty cycle range under the control of the control system, and can realize direct output of the battery through the inverter to continue outputting when power is cut off under the protection function of the UPS circuit, thereby improving the applicability of the inverter charging integrated power supply in different application scenarios. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 FIG. 1 is a circuit overall structure schematic diagram of the utility model;

[0017] Figure 2 FIG. 4 is a structure schematic diagram of a current main loop of the utility model;

[0018] Figure 3 FIG. 6 is a structure schematic diagram of a Boost voltage boosting circuit and a Buck voltage reducing circuit of the utility model;

[0019] Figure 4 Structural schematic diagram of the control system supporting the present utility model;

[0020] Figure 5 Circuit structural schematic diagram of the transformer of the present utility model. Specific implementation manners

[0021] The present utility model will be further described below in conjunction with the accompanying drawings, but the protection scope of the present utility model is not limited to the following.

[0022] Embodiment 1: As Figures 1 to 5 shown, a digital integrated inverter and charger power supply includes a main current loop and its supporting control system. The main current loop includes a Boost boost circuit, a Buck buck circuit, a full-bridge inverter circuit composed of power switch devices, a metering circuit, a control circuit, and a UPS circuit. The control system includes an auxiliary power supply, a cooling fan, voltage and current monitoring, and a signal transfer board. The control circuit uses a digital signal processor U9 as the core to perform logic control programming on the entire circuit, and the output of the control circuit controls the entire circuit in digital form.

[0023] As an optional technical scheme of the utility model, the Boost voltage increasing circuit includes transformer, IGBT half bridge module, IGBT driver, drive resistance R7 and protection resistance R11, and the input interface gives a digital signal to the driving chip for key operation and processing, and is controlled by standard TTL logic level signal, has two enable control ends, allows or prohibits the device to work under the condition of not being influenced by the input signal, has a logic power input end, and makes the internal logic circuit part work under low voltage, can be externally connected with detection resistance, and the change amount is fed back to the control circuit. Meanwhile, the MOS tube controls the waveform shaping and the strengthening driving. The rising edge of the driving pulse makes Q2, Q5 conduct, at this time, Q1, Q4 are cut off because the b electrode voltage is higher than the e electrode voltage, and the voltage is provided to the G electrode through Q2, Q5 and R11, R7, and the G and S electrodes are charged. When the pulse ends, the falling edge of the pulse makes Q2, Q5 cut off quickly, at this time, the G and S electrodes are charged, and the e electrode of Q1, Q4 is higher than the b electrode, so that Q1, Q4 are conducted to make the interelectrode capacitance discharge quickly, so as to prepare for the next conduction. A conduction back and forth generates the highest peak value output sine wave alternating current to the transformer T1, T2, and the MOS tube Q12, Q13, Q11, Q10 shape the current and output sine wave alternating current to the transformer T4, T5. When the primary winding of the transformer T1, T2, T4, T5 is connected with alternating voltage, the current passes through the primary winding. The magnetic flux generated by the magnetic potential of the primary winding is mostly closed through the iron core, thereby inducing the electromotive force in the secondary winding. If the secondary winding is connected with a load, the current passes through the secondary winding. The magnetic flux generated by the magnetic potential of the secondary winding is also mostly closed through the iron core. Therefore, the magnetic flux in the iron core is a combined magnetic flux generated by the magnetic potential of the primary and secondary windings, which is called main magnetic flux and is represented by phi. The electromotive forces induced in the primary and secondary windings by the main magnetic flux are and respectively. In addition, the magnetic potential of the primary and secondary windings also generates leakage magnetic flux and respectively (only linked with the winding), thereby generating leakage magnetic flux electromotive force in the respective windings, so as to output voltage boosting.

[0024] As an optional technical scheme of the utility model, the Buck voltage decreasing circuit includes inductor, MOS tube Q3, diode D3, electrolytic capacitor C37, DC-DC power chip U11, drive resistance R29, R67 and protection resistance C35. The drive resistance R29, R67 drives the MOS tube Q3 to generate driving pulse, and the driving pulse switches the on and off states of the MOS tube through the control input duty cycle variable PWM wave, and outputs direct current voltage through the electrolytic capacitor C37, the protection resistance C35 and the diode D3. The DC-DC power chip U11 converts the direct current voltage provided by the input power into adjustable low voltage output, thereby meeting the power supply requirements of different circuits.

[0025] As an optional technical scheme of the utility model, the full-bridge inverter circuit includes four IGBT modules and drive circuits thereof, the drive circuit includes drive resistors R4, R13, R62 and R63, protection resistors, diodes and discharge capacitors, the full-bridge inverter circuit is an IGBT full-bridge inverter circuit, the full-bridge inverter circuit includes two IGBT half-bridge modules Q6 and Q7 and corresponding two IGBT drivers Q8 and Q9, one pulse value is given to the drive resistors R4, R13, R62 and R63 so that the drive chips U14, U15, U16 and U17 carry out logic operation and processing of internal logic circuit parts under low voltage; the change amount can be fed back to the inverter circuit by connecting detection resistors outside, the full-bridge inverter circuit is an IGBT full-bridge inverter circuit, which includes two IGBT half-bridge modules Q6 and Q7 and corresponding two IGBT drivers Q8 and Q9.

[0026] As an optional technical scheme of the utility model, the metering circuit includes a metering chip U23, a DC input chip and a drive resistor R84, the output voltage of the drive resistor R84 drives the light-emitting diode (LED) input by the DC input optical coupler-phototransistor U23 to emit light of a certain wavelength, which is received by a light detector to generate a photoelectric current, and then the output is amplified further to convert the electrical signal into data readable by the single-chip microcomputer, and then the single-chip microcomputer calculates and outputs the data in digital form to realize metering, the collected electrical signal is sent to the input port of the metering chip U23 through the front-end acquisition circuit and signal conditioning circuit, the metering chip U23 usually integrates an analog-to-digital conversion module and a digital processing module, and stores the parameters in a parameter output register, and realizes information exchange with the processor through a communication interface.

[0027] As an optional technical scheme of the utility model, the UPS circuit is under normal state, the commercial power charges the battery through the charger and the self starting relay is attracted, R1 and VZ1, VZ2 divide the voltage of the battery +24V and sample, the sampling voltage Vo is added to the base of V1 through R2, VD3, makes V1 in linear amplification state, V2, V3 is deeply saturated, the direct current control relay K is attracted, +24V voltage is sent to the inverter V+ end through K, K1, the inverter works, and outputs 220V sine wave voltage, and the self locking relay K2 is attracted simultaneously. When the commercial power is powered off, K1 is disconnected, the initial input voltage +24V does not change, K continues to be attracted, and due to the self locking effect of K2, +24V is still normally sent to the inverter. After a period of time, the battery voltage begins to drop, Vo follows the drop, V1 conduction weakens, and V2 rises. When V2 rises to a certain value (i.e. the battery voltage drops to 22V), V2 exits saturation and enters linear amplification, and V3 rapidly drops. V3 is fed back to the base of V1 through R7, so that V2 continues to rise, forming an avalanche process, while V2 and V3 rapidly cut off, K is disconnected, the +24V direct current sent by the battery to the inverter is cut off, and the inverter stops working, and K2 is disconnected at the same time. After the inverter stops working, due to the electromotive force in the battery, the battery quickly recovers to 24V voltage, and V2 and V3 are saturated, and K is attracted, but due to the fact that K1 and K2 are disconnected at this time, +24V cannot reach the inverter, and the inverter does not work, thereby protecting the battery. Only when the commercial power is restored to normal, K1 is attracted, and the inverter can work, at which time the charger has charged the battery.

[0028] As an optional technical scheme of the utility model, the control system further includes a touch screen for realizing a control mode, and the touch screen is used for transmitting communication data with the control board, displaying grid voltage, displaying the working state of main functional devices of equipment, digitally regulating output power, digitally regulating IGBT switching frequency, digitally regulating output square wave pulse width and duty cycle, and displaying the temperature of key devices.

[0029] As an optional technical scheme of the utility model, the signal adapter board is used for voltage and current signal sampling, control power conversion and distribution, fan start and stop, IGBT temperature signal sampling and over-temperature protection, signal transmission with the IGBT drive board, and signal transmission with the control board.

[0030] In summary, the digital inverter charging integrated power supply can realize continuous adjustment in the numerical control type output power range of the inverter power supply, continuous adjustment in the numerical control type inverter bridge switching frequency range, continuous adjustment in the numerical control type output square wave pulse width and duty cycle range, and direct output of the battery through the inverter to continue outputting when the commercial power is powered off under the protection function of the UPS circuit, thereby improving the applicability of the inverter charging integrated power supply in different application scenarios.

[0031] Although the embodiments of the utility model have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the utility model, and the ordinary skilled in the art can change, modify, replace and transform the above-mentioned embodiments within the scope of the utility model without departing from the principles and purposes of the utility model. The scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A digital inverter-charger integrated power supply, characterized in that: The system includes a main current circuit and its supporting control system. The main current circuit includes a Boost converter, a Buck converter, a full-bridge inverter circuit composed of power switching devices, a metering circuit, a control circuit, and a UPS circuit. The control system includes an auxiliary power supply, a cooling fan, voltage and current monitoring, and a signal adapter board. The control circuit uses a digital signal processor U9 as its core to perform logic control programming on the entire circuit, and the output of the control circuit is in digital form to control the entire circuit.

2. The digital inverter-charger integrated power supply according to claim 1, characterized in that: The Boost circuit includes a transformer, an IGBT half-bridge module, an IGBT driver, a drive resistor R7, and a protection resistor R11.

3. The digital inverter-charger integrated power supply according to claim 2, characterized in that: The Buck step-down circuit includes an inductor, a MOSFET Q3, a diode D3, an electrolytic capacitor C37, a DC-DC power supply chip U11, driving resistors R29 and R67, and a protection resistor C35.

4. The digital inverter-charger integrated power supply according to claim 3, characterized in that: The full-bridge inverter circuit includes four IGBT modules that make up the full bridge and their driving circuit. The driving circuit includes driving resistors R4, R13, R62 and R63, a protection resistor, a diode, and a discharge capacitor. The full-bridge inverter circuit is an IGBT full-bridge inverter circuit, which includes two IGBT half-bridge modules Q6 and Q7 and two corresponding IGBT drivers Q8 and Q9.

5. The digital inverter-charger integrated power supply according to claim 4, characterized in that: The metering circuit includes a metering chip U23, a DC input chip, and a drive resistor R84.

6. The digital inverter-charger integrated power supply according to claim 5, characterized in that: Under normal conditions, the UPS circuit charges the battery through the charger and activates the self-starting relay.

7. A digital inverter-charger integrated power supply according to claim 6, characterized in that: The control system also includes a touch screen for implementing control methods. The touch screen is used for transmitting communication data with the control board, displaying the mains voltage, displaying the working status of the main functional components of the equipment, digitally regulating the output power, digitally regulating the IGBT switching frequency, digitally regulating the output square wave pulse width and duty cycle, and digitally displaying the temperature of key components.

8. A digital inverter-charger integrated power supply according to claim 7, characterized in that: The signal adapter board is used for voltage and current signal sampling, control power conversion and distribution, fan start and stop, IGBT temperature signal sampling and over-temperature protection, signal transmission with the IGBT driver board, and signal transmission with the control board.

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