Switching power supply input self-checking voltage doubling circuit
By combining the mains voltage level detection module and the voltage multiplier module, the analog circuit automatically determines the input voltage level, solving the problem of irreversible damage to small and medium power switching power supplies caused by human error. It achieves automatic adjustment of the output voltage, with a simple structure and low cost.
Patent Information
- Application Number
- CN202422637810.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-30
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-10-30
AI Technical Summary
Existing small and medium power switching power supplies are prone to incorrect gear switching due to human error when judging the input AC voltage level, which can lead to irreversible damage to the power module.
The system employs a combination of a mains voltage level detection module and a voltage multiplier module. It automatically determines the input voltage level through analog circuitry, uses operational amplifier A to drive transistor Q1 to achieve voltage multiplication and rectification, and automatically adjusts the output voltage by combining the activation and deactivation of relay RY1.
It achieves automatic judgment of input voltage level, avoiding irreversible power supply damage caused by human error, and has a simple structure and low cost.
Smart Images
Figure CN223540445U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of switching power supply technology, specifically to a switching power supply input self-test voltage multiplier circuit. Background Technology
[0002] A switching power supply is a power supply that uses modern power electronics technology to control the switching time ratio to maintain a stable output voltage. It takes AC voltage as input and outputs DC voltage, and is typically used to provide stable DC power to various devices such as PLCs, sensors, relays, and touchscreens.
[0003] Currently, in small and medium power switching power supplies without PFC, the AC mains power needs to be rectified into 310V DC and then regulated by a switching converter before supplying power to the downstream load. To adapt to domestic and international markets, the input typically needs to be compatible with both 110V and 220V op-amps. To achieve a stable 310V DC voltage after rectification, the 110V op-amp needs to be multiplied while the 220V op-amp does not. Existing voltage multiplier rectifier circuits usually require a range switch to manually determine the input AC voltage range. If the switch makes an incorrect judgment, resulting in a 220V voltage multiplication, it will cause irreversible damage to the power supply module. Therefore, it is necessary to optimize the input self-test voltage multiplier circuit of the switching power supply through technological innovation and design optimization. Utility Model Content
[0004] In existing small and medium power switching power supplies without PFC, the mains power needs to be rectified to 310V DC and then regulated by a switching converter before supplying power to the downstream load. To adapt to domestic and international markets, the input typically needs to be compatible with both 110V and 220V op-amps. To achieve a stable 310V DC voltage after rectification, the 110V op-amp needs to be multiplied, while the 220V op-amp does not. Existing voltage multiplier rectifier circuits usually require a range switch to manually determine the input AC voltage range. If the switch misjudges and causes a 220V voltage multiplication, it can lead to irreversible damage to the power supply module. To solve the above problems, this application provides a switching power supply input self-test voltage multiplier circuit. It automatically determines the input voltage level through an analog circuit to achieve 110V multiplication rectification. The circuit is simple in structure and low in cost, avoiding irreversible damage to the power supply caused by incorrect mains voltage range switch operation.
[0005] The technical solution adopted by the embodiments of this application to solve its technical problem is:
[0006] The switching power supply input self-test voltage multiplier circuit includes:
[0007] A mains power level detection module is provided, which is connected to a voltage multiplier module. The mains power level detection module and the voltage multiplier module cooperate with each other.
[0008] In one possible implementation, the mains power level detection module includes a transistor Q1. The transistor Q1 is connected to a resistor R30 via a wire. The resistor R30 and transistor Q1 are connected to a resistor R31, a power capacitor CE4, and a diode D4 via three wires. The resistor R30 is connected to operational amplifier A. The diode D4 is connected to a resistor R28, which is connected to the positive terminal of operational amplifier A. The resistor R31, power capacitor CE4, and transistor Q1 are all interconnected and connected to operational amplifier A. The negative terminal of operational amplifier A is connected to a resistor R14, which is connected to a capacitor C1. The capacitor C1 is connected to... A neutral wire N is connected, which is connected to transistor Q1. Resistor R28 is connected to the positive terminal of operational amplifier A via resistors R27 and R29. Resistor R29 is connected to diode D6. Resistor R27 is connected to resistor R26. Resistor R26 is connected to diode D3. Diodes D3 and D6 are connected. Resistor R25 and capacitor C6 are connected between diodes D3 and D6 respectively. Resistor R25 and capacitor C6 are both connected to live wire L. Diode D2 is connected between capacitor C6 and live wire L. Diode D2 and resistor R14 are connected to capacitor C1.
[0009] In one possible implementation, diode D4 is connected to resistor R28. Resistor R14 and op-amp A are connected via wires to capacitor C4, resistor R21, and capacitor C5, respectively. Power capacitor CE3 and diode D5 are connected between resistors R27 and R26, respectively. Power capacitor CE3 and diode D5 are both connected to resistor R29 and diode D6. Voltage multiplication is achieved by op-amp A driving transistor Q1. Because op-amp A has low power consumption, a stable 15V supply voltage is provided to op-amp A in the circuit. The 15V is divided to produce 7.5V, which is used as the reference voltage at the positive input terminal of op-amp A. The negative input terminal of op-amp A is the voltage after rectification and voltage division of the mains power. When the power is turned on, if the input is 110V, the negative input voltage of op-amp A is 6.3V, which is less than the reference voltage at the positive input terminal. Therefore, op-amp A outputs a high level, transient voltage suppression diode TVS1 turns on, relay RY1 is energized, and the voltage is doubled and rectified to 310V. DC If the input voltage is 220V and the voltage at the negative input terminal of op-amp A is 12.5V, which is greater than the reference voltage, then op-amp A will output 0V, the transient voltage suppressor diode TVS1 will not conduct, the relay RY1 will not engage, and the main power output voltage will be 220V with a rectified voltage of 310V. DC This is used to perform voltage division detection of the mains power level to determine the magnitude of the input voltage.
[0010] In one possible implementation, the voltage multiplier module includes a rectifier bridge B1, which is connected to a neutral wire N, a voltage input VB, a live wire L, and a power input line PG. The power input line PG is connected to a capacitor C3, which is connected to a capacitor C2. A relay RY1 is connected between capacitor C3 and capacitor C2. The relay RY1 is connected to the live wire L, which is connected to a diode D1. The diode D1 is connected to a resistor R7, which is connected to a resistor R8. A power capacitor CE2 is connected to the resistor R8. A resistor R9 is connected between resistor R7 and diode D1. Resistor R9 is connected to resistor R10. Transient voltage suppressor diode TVS1 is connected to resistor R10. Transient voltage suppressor diode TVS1 is connected to LDOWN. LDOWN is connected to relay RY1. LDOWN, relay RY1, and power capacitor CE2 are connected. Relay RY1 is connected to neutral line N, which facilitates voltage multiplication of the input mains power by activating relay RY1. When relay RY1 is deactivated, voltage multiplication is not required, thus facilitating voltage multiplication of the mains power.
[0011] In one possible implementation, the voltage multiplier module and the mains power level detection module are interconnected via LDOWN to facilitate the formation of a path, enabling the two modules to work together.
[0012] In summary, this utility model has at least one of the following beneficial technical effects:
[0013] By automatically determining the input voltage level through analog circuitry, a 110-fold voltage multiplier rectification is achieved. This method is simple in structure, low in cost, and avoids irreversible power supply damage caused by incorrect operation of the mains power switch. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of a voltage multiplier module;
[0015] Figure 2 This is a schematic diagram of the mains power level detection module. Detailed Implementation
[0016] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The instrument placement rack involved in this utility model is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0017] This embodiment describes the specific structure of the input self-test voltage multiplier circuit for a switching power supply. See details in the attached document. Figures 1-2As shown, the switching power supply input self-test voltage multiplier circuit includes:
[0018] The mains power level detection module is connected to a voltage multiplier module, and the mains power level detection module and the voltage multiplier module work together.
[0019] In existing voltage doubler rectifier circuits, a range switch is usually required to manually determine the input AC voltage range. If the switch makes an incorrect judgment, resulting in a 220V voltage double, it will cause irreversible damage to the power module.
[0020] The mains power level detection module includes transistor Q1. Transistor Q1 is connected to resistor R30 via wires. Resistor R30 and transistor Q1 are connected to resistor R31, power capacitor CE4, and diode D4 via three wires respectively. Resistor R30 is connected to operational amplifier A. Diode D4 is connected to resistor R28, which is connected to the positive terminal of operational amplifier A. Resistor R31, power capacitor CE4, and transistor Q1 are all interconnected and connected to operational amplifier A. The negative terminal of operational amplifier A is connected to resistor R14, which is connected to capacitor C1. Capacitor C1 is connected to the neutral wire N. Neutral line N is connected to transistor Q1. Resistor R28 is connected to the positive terminal of op-amp A via resistors R27 and R29. Resistor R29 is connected to diode D6. Resistor R27 is connected to resistor R26. Resistor R26 is connected to diode D3. Diodes D3 and D6 are connected. Resistor R25 and capacitor C6 are connected between diodes D3 and D6 respectively. Resistor R25 and capacitor C6 are both connected to live wire L. Diode D2 is connected between capacitor C6 and live wire L. Diode D2 and resistor R14 are connected to capacitor C1.
[0021] In one possible implementation, diode D4 is connected to resistor R28, resistor R14 and op-amp A are respectively connected to capacitor C4, resistor R21 and capacitor C5 via wires, power capacitor CE3 and diode D5 are respectively connected between resistor R27 and resistor R26, and power capacitor CE3 and diode D5 are both connected to resistor R29 and diode D6.
[0022] Voltage multiplication is achieved by using operational amplifier A to drive transistor Q1. Because operational amplifier A has low power consumption, a stable 15V supply voltage is provided to it. This 15V is then divided to produce a 7.5V voltage, which serves as the reference voltage for the positive input of operational amplifier A. The negative input of operational amplifier A receives the rectified and divided voltage from the mains power. When the power is on, if the input is 110V, the negative input voltage of operational amplifier A is 6.3V, which is less than the reference voltage at the positive input. Therefore, operational amplifier A outputs a high level, the transient voltage suppressor diode TVS1 turns on, and the relay RY1 engages, resulting in a voltage multiplier and rectification to 310V. DCIf the input voltage is 220V and the voltage at the negative input terminal of op-amp A is 12.5V, which is greater than the reference voltage, then op-amp A will output 0V, the transient voltage suppressor diode TVS1 will not conduct, the relay RY1 will not engage, and the main power output voltage will be 220V with a rectified voltage of 310V. DC .
[0023] In one possible implementation, the voltage multiplier module includes a rectifier bridge B1, which is connected to a neutral line N, a voltage VB, a live line L, and a power input line PG. A capacitor C3 is connected to the power input line PG, and a capacitor C2 is connected to the power input line PG. A relay RY1 is connected between the capacitors C3 and C2. The relay RY1 is connected to the live line L, which is connected to a diode D1. A resistor R7 is connected to a resistor R8, and a power capacitor CE2 is connected to the resistor R8. A resistor R9 is connected between the resistor R7 and the diode D1, and a resistor R10 is connected to the resistor R10. A transient voltage suppressor diode TVS1 is connected to the transient voltage suppressor diode TVS1, which is connected to an LDOWN. The LDOWN is connected to the relay RY1, and the LDOWN is connected to the relay RY1 and the power capacitor CE2. The relay RY1 is connected to the neutral line N, facilitating voltage multiplication of the input AC power through the activation of the relay RY1. When the relay RY1 is deactivated, voltage multiplication is not required.
[0024] In one possible implementation, the voltage multiplier module and the mains power level detection module are interconnected via LDOWN to facilitate the formation of a path, enabling the two modules to work together.
[0025] Voltage multiplication is achieved by using operational amplifier A to drive transistor Q1. Because operational amplifier A has low power consumption, a stable 15V supply voltage is provided to it. This 15V is then divided to produce a 7.5V voltage, which serves as the reference voltage for the positive input of operational amplifier A. The negative input of operational amplifier A receives the rectified and divided voltage from the mains power. When the power is on, if the input is 110V, the negative input voltage of operational amplifier A is 6.3V, which is less than the reference voltage at the positive input. Therefore, operational amplifier A outputs a high level, the transient voltage suppressor diode TVS1 turns on, and the relay RY1 engages, resulting in a voltage multiplier and rectification to 310V. DC If the input voltage is 220V and the voltage at the negative input terminal of op-amp A is 12.5V, which is greater than the reference voltage, then op-amp A will output 0V, the transient voltage suppressor diode TVS1 will not conduct, the relay RY1 will not engage, and the main power output voltage will be 220V with a rectified voltage of 310V. DC It automatically determines the input voltage level through analog circuitry, achieving 110-fold voltage multiplier rectification. It has a simple structure and low cost, avoiding irreversible power supply damage caused by incorrect operation of the mains power switch.
[0026] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.
Claims
1. A switching power supply input self-test voltage multiplier circuit, characterized in that, include: A mains power level detection module is provided, which is connected to a voltage multiplier module, and the mains power level detection module and the voltage multiplier module cooperate with each other. The mains power level detection module includes a transistor Q1. Transistor Q1 is connected to a resistor R30 via a wire. Resistor R31, power capacitor CE4, and diode D4 are connected to transistor Q1 via three wires. Resistor R30 is connected to operational amplifier A. Diode D4 is connected to resistor R28, which is connected to the positive terminal of operational amplifier A. Resistor R31, power capacitor CE4, and transistor Q1 are all interconnected and connected to operational amplifier A. The negative terminal of operational amplifier A is connected to resistor R14, which is connected to capacitor C1. Capacitor C1 is connected to neutral line N. Neutral line N is connected to the transistor... The body tube Q1 is connected. Resistors R27 and R29 are connected to the positive terminal of op-amp A via a circuit. Resistor R29 is connected to diode D6. Resistor R27 is connected to resistor R26. Resistor R26 is connected to diode D3. Diodes D3 and D6 are connected. Resistor R25 and capacitor C6 are connected between diodes D3 and D6 respectively. Resistor R25 and capacitor C6 are both connected to live wire L. Diode D2 is connected between capacitor C6 and live wire L. Diode D2 and resistor R14 are connected to capacitor C1. Op-amp A is connected to a voltage of 15V. The voltage multiplier module includes a rectifier bridge B1, which is connected to a neutral line N, a voltage line VB, a live line L, and a power input line PG. The power input line PG is connected to a capacitor C3, which is connected to a capacitor C2. A relay RY1 is connected between capacitor C3 and capacitor C2. The relay RY1 is connected to the live line L. The live line L is connected to a diode D1. The diode D1 is connected to a resistor R7. The resistor R7 is connected to a resistor R8. The resistor R8 is connected to a power capacitor CE2. A resistor R9 is connected between resistor R7 and diode D1. The resistor R9 is connected to a resistor R10. A transient voltage suppression diode TVS1 is connected to resistor R10. The transient voltage suppression diode TVS1 is connected to a LDOWN. The LDOWN is connected to the relay RY1. The LDOWN and relay RY1 are connected to the power capacitor CE2. The relay RY1 is connected to the neutral line N.
2. The switching power supply input self-test voltage multiplier circuit as described in claim 1, characterized in that: The resistor R14 and the operational amplifier A are respectively connected by a capacitor C4, a resistor R21 and a capacitor C5 via wires. The resistor R27 and the resistor R26 are respectively connected by a power capacitor CE3 and a diode D5. The power capacitor CE3 and the diode D5 are both connected to the resistor R29 and the diode D6.
3. The switching power supply input self-test voltage multiplier circuit as described in claim 1, characterized in that: The voltage multiplier module and the mains power level detection module are interconnected via LDOWN.