Switching circuit for adjusting output current and voltage of power supply

Abstract

The utility model discloses a switching circuit for adjusting output current and voltage of a power supply, which comprises a switch and an LED silicon controlled rectifier dimming driver, and the LED constant current output silicon controlled rectifier dimming driver comprises an EMI circuit, a rectification circuit, a switch voltage adjusting circuit, a single-stage PFC flyback circuit, an isolation transformer, a BUCK constant current dimmable circuit and a dial current adjusting circuit. According to the technical scheme, the action parameter signal of the switch is transmitted to the detection pin of the power supply chip, the chip receives the signal to change the output current and the output voltage, and the technology is mainly applied to occasions requiring a constant current power supply with adjustable power.

Description

Technical Field

[0001] The utility model relates to the technical field of switches, in particular to a switch circuit for adjusting the output current and voltage of a power supply. Background Technique

[0002] The output current of the constant-current power supply on the market is single, and the power of the power supply is likely to exceed the rated power after the output current. In the existing constant-current power supply circuit for adjusting current, an MCU is mainly used. The MCU is expensive and requires a program to work, increasing the cost and the difficulty of implementation. Content of the Utility Model

[0003] Aiming at the deficiencies of the prior art, the utility model provides a switch circuit for adjusting the output current and voltage of a power supply to solve the technical problems in the prior art that "the output current of the constant-current power supply on the market is single, and the power of the power supply is likely to exceed the rated power after the output current. In the existing constant-current power supply circuit for adjusting current, an MCU is mainly used. The MCU is expensive and requires a program to work, increasing the cost and the difficulty of implementation".

[0004] To achieve the above objectives, the utility model is realized through the following technical solutions:

[0005] A switch circuit for adjusting the output current and voltage of a power supply includes a switch and an LED thyristor dimming driver.

[0006] The LED constant-current output thyristor dimming driver includes an EMI circuit, a rectifier circuit, a switch voltage regulation circuit, a flyback circuit, an isolation transformer, and a switch current regulation circuit.

[0007] As a preferred technical solution of the utility model, the switch is a double-row DIP switch, a double-row sliding switch, or a double-row push-button switch.

[0008] The utility model provides a switch circuit for adjusting the output current and voltage of a power supply, which has the following beneficial effects:

[0009] 1. In the traditional switch connection method, the switch is directly connected in parallel to the sampling resistor of the chip. The switch itself has impedance, and different manufacturers will affect the accuracy of the current. In the case of large current, the switch is mechanical and is easily damaged, with poor contact and arc generation, resulting in impedance changes and affecting the accuracy of the output current. However, the switch is used as a voltage division path for resistors R52 and R6\R7\R8\R10. These resistance values are much larger than the on-impedance of the switch, and the current flowing through the switch is tiny, and the current is relatively good at one time.

[0010] 2. The present utility model is a research in the field of power supply technology, which provides a method to simultaneously adjust the output current and output voltage through a switch, and solve the problem that the power of the power supply exceeds the rated power after the output current is changed. The technical solution transmits the action parameter signal of the switch to the detection pin of the power supply chip, and the chip changes the output current and output voltage after receiving the signal. This technology is mainly applied to the demand occasions of constant current power supplies with adjustable power. Brief Description of the Drawings

[0011] Figure 1 It is a block diagram of a switch circuit for adjusting the output current and voltage of a power supply proposed by the present utility model;

[0012] Figure 2 It is a schematic diagram of a switch circuit for adjusting the output current and voltage of a power supply proposed by the present utility model. Detailed Embodiment

[0013] The following further describes in detail the embodiments of the present utility model in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present utility model, but cannot be used to limit the scope of the present utility model. In the description of the present utility model, unless otherwise specified, the meaning of "multiple" is two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0014] Refer to Figure 1-2 , a switch circuit for adjusting the output current and voltage of a power supply, including a switch and an LED thyristor dimming driver,

[0015] The LED constant current output thyristor dimming driver includes an EMI circuit, a rectifier circuit, a switch voltage regulation circuit, a single-stage PFC flyback circuit, an isolation transformer, a BUCK constant current dimming circuit, and a DIP switch current regulation circuit;

[0016] The switch is a double-row DIP switch, a double-row slide switch, or a double-row push-button switch.

[0017] Specifically, the input end is connected to the mains power supply. Through the thyristor knob phase cutting and rectification, it is converted into high-voltage direct current power supply to the single-stage PFC flyback circuit. A low-voltage power supply of 45VDC is output through the transformer. At this time, the secondary BUCK constant current circuit starts to work and outputs current to the LED lamp. The magnitude of the output current depends on the voltage signal after the thyristor knob phase cutting, realizing the control of the magnitude of the output current. Different current gears can be controlled through the DIP switch, and different power levels can be switched.

[0018] Embodiment

[0019] Obtain a 220V AC voltage from the mains power supply. After processing the mains EM circuit, it is then converted into a DC voltage through the rectifier circuit and supplied to the PFC flyback circuit. The single-stage PFC flyback circuit will generate a 100KHz high-frequency PWM signal to control the on and off of the MOS, chop the high-voltage direct current, and then transfer it to the secondary through transformer isolation and coupling to provide a stable energy for the constant current load on the secondary.

[0020] Appendix Figure 2 When switch ① is closed, different voltage values are generated at different gears and transmitted to the current detection pin of chip ④, and then the flyback circuit is controlled to output corresponding current through the isolation transformer; when switch ② is closed, different voltage signals are generated at different gears and transmitted to the voltage detection pin of chip ③, and then the flyback circuit is controlled to output corresponding voltage through the isolation transformer; control the magnitude of the output current and output voltage, and then control the magnitude of the power, realizing the power control of the entire product. When the current changes, it effectively protects the power supply from over-power operation and realizes the protection of the reliability of the power supply.

[0021] As described above, it is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention.

Claims

1. A switch circuit for adjusting the output current and voltage of a power supply, comprising a switch and an LED thyristor dimming driver, characterized in that: The LED constant current output thyristor dimming driver comprises an EMI circuit, a rectifier circuit, a switch voltage regulation circuit, a flyback circuit, an isolation transformer, and a switch current regulation circuit.

2. A switch circuit for adjusting power supply output current and voltage according to claim 1, characterized in that: The switch is a double-row dial switch, a double-row slide switch, or a double-row push button switch.

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