Controllable direct current and alternating current power supply conversion circuit
By controlling transistor switches and microcontrollers, combined with power management chips, the current shunt regulation of the DC-to-AC circuit is realized, solving the problems of substandard power specifications and safety in existing technologies, and providing a stable and safe 110V AC output.
Patent Information
- Application Number
- CN202422902511.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-27
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-11-27
AI Technical Summary
Existing DC-to-AC circuits have substandard power supply specifications and are unsafe and unreliable when outputting high-voltage AC power.
A controllable DC-AC power conversion circuit is adopted. The transistor switch is controlled through the H1_5 signal path to the H1_8 signal path. Combined with a microcontroller and power management chip, the current is shunt and parallel regulated. The current magnitude and phase are controlled by PWM signal to output a stable 110V AC power.
It achieves controllable 110V AC output, adapts to complex environments, is stable, safe and reliable, and meets the needs of different loads.
Smart Images
Figure CN223488113U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power conversion circuit technology, and in particular to a controllable DC-AC power conversion circuit. Background Technology
[0002] As electric vehicles continue to develop, their functions are becoming increasingly diverse. This brings with it the issue of load. Due to the increasing load, some power-consuming devices can no longer use direct current (DC) and need to be converted to high-voltage alternating current (AC) for output.
[0003] Currently, the circuits on the market that convert DC to AC to output high-voltage AC power are unreasonable, the output power specifications do not meet the predetermined requirements, and they are unsafe and unreliable. Utility Model Content
[0004] This utility model addresses the shortcomings of existing technologies by providing the following technical solution:
[0005] A controllable DC-AC power conversion circuit, comprising:
[0006] DC to AC circuit;
[0007] The DC-to-AC circuit includes signal paths H1_5, H1_6, H1_7, and H1_8.
[0008] The H1_5 signal path is used to control the switching of transistor Q8, and indirectly control the switching of transistor Q3;
[0009] The H1_6 signal path is used to control the switching of transistor Q6 and indirectly control the switching of transistor Q4;
[0010] Among them, the H1_5 signal path and the H1_6 signal path are used to control the output of the upper half bridge;
[0011] The H1_7 signal path is used to control the switching of transistor Q15 and indirectly control the switching of transistor Q11.
[0012] The H1_8 signal path is used to control the switching of transistor Q12 and indirectly control the switching of transistor Q17;
[0013] The H1_7 and H1_8 signal paths are used to control the output of the lower half-bridge.
[0014] As an improvement to the above technical solution, the input terminals of the H1_5 signal path, H1_6 signal path, H1_7 signal path and H1_8 signal path are all connected to the signal input terminal of the microcontroller, and the microcontroller has a JTAG interface for programming and debugging the microcontroller.
[0015] As an improvement to the above technical solution, the output terminal of the DC-to-AC circuit is connected to a power management chip via a filtering and voltage regulation circuit. The power management chip is used to control the input and output of the power supply.
[0016] As an improvement to the above technical solution, the upper and lower half-bridges of the DC-to-AC circuit are connected in parallel to divide the current into two paths. The resistance values of the upper and lower half-bridges are different, and the parallel connection node of the upper and lower half-bridges is adjustable so that the resistance values of the two parallel resistors can be changed.
[0017] As an improvement to the above technical solution, transistors Q6, Q8, Q15, and Q17 are all grounded.
[0018] The beneficial effects of this utility model are:
[0019] The technical solution provided by this utility model enables software-adjustable PWM control of 110V AC output. In this process, the frequency, phase and related parameters of the output 110V AC can be adjusted by changing the duty cycle, frequency and phase of the PWM, so as to achieve controllable 110V AC output, adapt to various complex AC working environments, and be stable, safe and reliable. Attached Figure Description
[0020] Figure 1 This is a circuit diagram for a controllable DC-AC power conversion.
[0021] Figure 2 A microcontroller circuit designed to work in conjunction with a DC / AC power conversion circuit. Detailed Implementation
[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the following provides a more detailed description of the utility model. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of the utility model.
[0023] Currently, the circuits on the market that convert DC to AC to output high-voltage AC power are unreasonable, the output power specifications do not meet the predetermined requirements, and they are unsafe and unreliable.
[0024] See appendix Figure 1-2 As shown, in order to solve the above-mentioned technical problems, this utility model provides a controllable DC-AC power conversion circuit, including: a DC-to-AC circuit.
[0025] It should be noted that the power supply parameters referenced in this solution are Vin=12V.1.5A.DC and Vout=110V.200MA.
[0026] In this solution, the MPQ3910A chip is used to receive the 12V DC power input from the vehicle. The Boost circuit operates based on the control of a switching transistor, using a PWM (Pulse Width Modulation) signal to control the transistor's on / off state, thus achieving a 110V DC output.
[0027] See appendix Figure 1 As shown, attached Figure 1 The paper presents a specific implementation of a DC-to-AC circuit.
[0028] The DC-DC switching circuit in this solution borrows from a conventional dual-bridge circuit structure. The difference lies in its ability to drive an external MOSFET via a PWM boost control circuit, thus handling currents exceeding 10A. This constitutes the main power output module. It should be noted that the power output module is not a technical aspect requiring protection in this solution, and therefore will not be discussed further here.
[0029] The working principle of a DC-to-AC circuit is as follows:
[0030] By splitting the current into two paths and passing them through different resistors, the current can be controlled and regulated. In this scheme, the circuit is constructed using resistors connected in parallel. The node where the resistors are connected in parallel is connected to the positive and negative terminals of the power supply, and the other two nodes are connected to the two loads respectively.
[0031] When current flows through a DC-to-AC circuit, it splits into two paths before entering the parallel connection node, each passing through a resistor. By adjusting the resistance values of these two resistors, the current across the two loads can be controlled.
[0032] When current flows from the positive terminal into the parallel node, it is divided into the two parallel resistors according to their resistance values. The current in the two loads is also divided in the same proportion. By changing the resistance values of the two resistors, the current division ratio can be changed, thereby adjusting the current in each load.
[0033] See appendix Figure 1-2 As shown in the figure, this solution provides a specific implementation of a DC-to-AC circuit. Figure 2 The microcontroller circuit described herein can use software to control one 110V output using four independent PWM channels.
[0034] Specifically, the DC-to-AC circuit includes signal paths H1_5, H1_6, H1_7, and H1_8.
[0035] The H1_5 signal path is used to control the switching of transistor Q8, and indirectly control the switching of transistor Q3.
[0036] The H1_6 signal path is used to control the switching of transistor Q6, and indirectly controls the switching of transistor Q4;
[0037] Among them, signal paths H1_5 and H1_6 are used to control the output of the upper half bridge;
[0038] The H1_7 signal path is used to control the switching of transistor Q15, and indirectly control the switching of transistor Q11.
[0039] The H1_8 signal path is used to control the switching of transistor Q12, and indirectly control the switching of transistor Q17.
[0040] Among them, signal paths H1_7 and H1_8 are used to control the output of the lower half bridge.
[0041] The working process of the first half cycle of the DC-to-AC circuit is as follows:
[0042] When the transistor Q3 controlled by the H1_5 signal path is turned on, 110V current is output to the load through the transistor Q3. At the same time, the transistor Q17 controlled by the H1_8 signal path is turned on, and the load current is grounded through the transistor Q17, forming a complete loop. Throughout the process, the transistor Q4 controlled by the H1_6 signal path and the transistor Q11 controlled by the H1_7 signal path remain turned off.
[0043] The working process of the second half-cycle of the DC-to-AC circuit is as follows:
[0044] When transistor Q4, controlled by signal path H1_6, is turned on, 110V current is output to the load through transistor Q4. When transistor Q11, controlled by signal path H1_7, is turned on, the load current is grounded through transistor Q11, forming a complete circuit. Similarly, throughout the entire process, transistor Q3, controlled by signal path H1_5, and transistor Q17, controlled by signal path H1_8, remain turned off.
[0045] Among them, transistors Q6, Q8, Q15, and Q17 are all grounded.
[0046] The above design enables software-adjustable PWM control of the 110V AC output. During this process, the frequency, phase, and related parameters of the output 110V AC can be adjusted by changing the duty cycle, frequency, and phase of the PWM, thereby achieving a controllable 110V AC output to adapt to various complex AC working environments, while ensuring stability, safety, and reliability.
[0047] The input terminals of signal paths H1_5, H1_6, H1_7, and H1_8 are all connected to the signal input terminals of the microcontroller, which has a JTAG interface for programming and debugging.
[0048] The H1_5, H1_6, H1_7 and H1_8 signal paths can be controlled by a microcontroller. Furthermore, the microcontroller can be programmed and debugged to meet different usage scenarios under different operating requirements.
[0049] The output of the DC-to-AC converter circuit is connected to the power management chip after passing through a filter and voltage regulator circuit. The power management chip is used to control the input and output of the power supply to ensure that the output is stable.
[0050] The above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit it.
Claims
1. A controllable DC-AC power conversion circuit, characterized in that, include: DC to AC converter circuit; The DC-to-AC circuit includes signal paths H1_5, H1_6, H1_7, and H1_8. The H1_5 signal path is used to control the switching of transistor Q8, and indirectly control the switching of transistor Q3. The H1_6 signal path is used to control the switching of transistor Q6 and indirectly control the switching of transistor Q4; The H1_5 and H1_6 signal paths are used to control the output of the upper half-bridge. The H1_7 signal path is used to control the switching of transistor Q15 and indirectly control the switching of transistor Q11. The H1_8 signal path is used to control the switching of transistor Q12 and indirectly control the switching of transistor Q17; The H1_7 and H1_8 signal paths are used to control the output of the lower half-bridge.
2. The controllable DC-AC power conversion circuit according to claim 1, characterized in that: The input terminals of the H1_5, H1_6, H1_7 and H1_8 signal paths are all connected to the signal input terminals of the microcontroller, which has a JTAG interface for programming and debugging.
3. The controllable DC-AC power conversion circuit according to claim 1, characterized in that: The output of the DC-to-AC circuit is connected to the power management chip via a filter and voltage regulator circuit. The power management chip is used to control the input and output of the power supply.
4. The controllable DC-AC power conversion circuit according to claim 1, characterized in that: The upper and lower half-bridges of the DC-to-AC circuit are connected in parallel to split the current into two paths. The resistance values of the upper and lower half-bridges are different, and the parallel connection node of the upper and lower half-bridges is adjustable so that the resistance values of the two parallel resistors can be varied.
5. The controllable DC-AC power conversion circuit according to claim 1, characterized in that: Transistors Q6, Q8, Q15, and Q17 are all grounded.