A high power factor electric flame furnace power supply circuit

Abstract

The utility model discloses a high power factor's electric flame furnace power supply circuit for electric flame furnace, it is characterized by: high power factor's electric flame furnace power supply circuit includes circuit control module, input module, output module. The utility model directly changes the commercial power of low frequency AC into direct current, and PFC power supply circuit guarantees that full -bridge rectifier circuit will not appear the situation of cut -off, improves power factor, and the characteristics of this circuit is that circuit is simple, and the volume is small, and cost is low.

Description

Technical Field

[0001] This utility model relates to the field of electric flame furnace technology, and in particular to a power supply circuit for an electric flame furnace with a high power factor. Background Technology

[0002] In the power supply system of electric flame furnaces, traditional power supply methods often directly use low-frequency AC power through complex circuits to power the equipment. This method has significant drawbacks: firstly, it is too costly; secondly, it is too bulky. Therefore, there is an urgent need for a power supply circuit that can efficiently convert low-frequency AC power into DC power, while possessing high power factor, stable voltage, low cost, and small size, to solve the above problems. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a high power factor electric flame furnace power supply circuit, which can convert low-frequency AC power into stable DC power through a circuit controlled by the control chip U to power the electric flame furnace. This conversion circuit is simple, low-cost and small in size, overcoming the shortcomings of the prior art.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows: A high power factor electric flame furnace power supply circuit, used in an electric flame furnace, characterized in that: the high power factor electric flame furnace power supply circuit includes a circuit control module, an input module, and an output module; The circuit control module includes a full-bridge rectifier circuit, which uses a rectifier bridge BD1. The two AC input terminals of the rectifier bridge BD1 are connected to the L line and the N line, respectively. The first output terminal of the rectifier bridge BD1 is connected to a resistor R. CS Connect to pin 3 of the main control chip, and the second output terminal is connected to inductor R. M Connection, inductor R M The other end is connected to the drain of the switching transistor Q1 and the diode D1. The gate of the switching transistor Q1 is connected to pin 8 of the main control chip, and its drain is grounded. The other end of the diode D1 is connected to two resistors R connected in series. FB1 R FB2 and electrolytic capacitor C OUT R FB2 and electrolytic capacitor C OUT The other end is grounded; The input module includes diodes D2 and D3, and capacitor C. IN C BR C M resistance R sense R BR1 R BR2 R M The diode D3 and resistor R senseConnect the first output terminal of BD1, and ground the other end of diode D3. Connect the second output terminal of BD1 to diode D2 and capacitor C. IN One end and resistor R BR1 Connect the diode D2 to the capacitor C. OUT Connection, capacitor C IN The other end and resistor R sense Series connection, resistor R BR1 and R BR2 Series connection, capacitor C BR and resistance R BR2 The capacitor C is connected in parallel to pin 4 of the main control chip. M and resistance R M The diode D3 and resistor R are connected in parallel and to pin 2 of the main control chip. sense R BR2 R M and capacitor C BR C M The other end is grounded; The output module includes capacitor C. P C Z C VDD C FB and resistance R Z R FB1 R FB2 Pin 7 of the main control chip is connected to C VDD Connection, capacitor C FB and resistance R Z Connected in parallel and to pin 5 of the main control chip, resistor R Z With capacitor C Z The capacitor C is connected in series. P C Z C VDD C FB The other end is grounded; the P FC The power supply circuit converts low-frequency AC to DC.

[0005] The switching transistor Q1 is an N-channel MOSFET.

[0006] The main control chip U adopts a high-performance, continuous conduction mode (CCM) boost constant voltage power factor correction (PFC) controller, which is the front-end regulator in the AC-DC converter.

[0007] The above technical solution has the following beneficial effects: This invention utilizes an electric flame furnace power supply circuit, which enables the circuit to efficiently convert low-frequency AC power into stable DC power. It features advantages such as high power factor, low output voltage ripple, simple circuit, small size, and low cost, thus optimizing the user experience. Attached Figure Description

[0008] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0009] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0010] Figure 1 This is the circuit schematic diagram of this utility model. Detailed Implementation

[0011] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0012] See Figure 1 As shown, this utility model discloses a high power factor power supply circuit for an electric flame furnace, characterized in that: the high power factor power supply circuit includes a circuit control module, an input module, and an output module; The circuit control module includes a full-bridge rectifier circuit, which uses a rectifier bridge BD1. The two AC input terminals of BD1 are connected to the L line and the N line, respectively. The first output terminal of BD1 is connected to a resistor R. CS Connect to pin 3 of the main control chip, and the second output terminal is connected to inductor R. M Connection, inductor R M The other end is connected to the drain of the switching transistor Q1 and the diode D1. The gate of the switching transistor Q1 is connected to pin 8 of the main control chip, and the source is grounded. The other end of the diode D1 is connected to two resistors R connected in series. FB1 R FB2 and electrolytic capacitor C OUT R FB2 and electrolytic capacitor C OUT The other end is grounded; The input module includes diodes D2 and D3, and capacitor C. IN C BR C M resistance R sense R BR1 R BR2 R M The diode D3 and resistor R sense Connect the first output terminal of BD1, and ground the other end of diode D3. Connect the second output terminal of BD1 to diode D2 and capacitor C. IN and resistance R BR1 Connect the diode D2 to the capacitor C. OUT Connection, capacitor C IN One end and resistor R sense Connection, resistor R BR1 and R BR2 Series connection, capacitor C BR and resistance R BR2 The capacitor C is connected in parallel to pin 4 of the main control chip. M and resistance R M The diode D3 and resistor R are connected in parallel and to pin 2 of the main control chip. sense R BR2 R M and capacitor C BR C M The other end is grounded; The output module includes capacitor C. P C Z C VDD C FB and resistance R Z R FB1 R FB2 Pin 7 of the main control chip is connected to C VDD Connection, capacitor C FB and resistance R Z Connected in parallel and to pin 5 of the main control chip, resistor R Z With capacitor C Z The capacitor C is connected in series. P C Z C VDD C FB The other end is grounded; the P FC The power supply circuit converts low-frequency AC to DC.

[0013] The switching transistor Q1 is an N-channel MOSFET.

[0014] The main control chip U uses the SOP8 control chip U, which is a high-performance, continuous conduction mode (CCM) boost constant voltage power factor correction (PFC) controller. The main control chip U can serve as a front-end regulator in AC-DC converters, featuring high power factor (PF), low current distortion (THD), and excellent voltage regulation performance. The main control chip U achieves power factor correction by detecting inductor current and input voltage and controlling the on-time of the power switch at a fixed switching frequency. The main control chip U reduces the number of external components, simplifies system design, and lowers production costs. The main control chip U integrates comprehensive protection functions, including: VDD over / under voltage protection (VDD OVP / UVLO), input undervoltage protection (BOP), output over / under voltage protection (FB OVP / UVP), cycle-by-cycle overcurrent protection (CBC OCP), cycle-by-cycle overload protection (CBCOLP), CS pin open-circuit protection (CS OP), and overheat protection (OTP).

[0015] The working principle of this utility model: The induction cooker plug is directly inserted into the socket to connect to the mains power. The electric flame furnace power supply circuit directly converts the low-frequency AC mains power into DC power. The electric flame furnace power supply circuit ensures that the full-bridge rectifier circuit will not experience current interruption, thus improving the power factor. The characteristics of this circuit are simple circuit, small size, and low cost.

[0016] Diode D2 is the output start-up diode. When the circuit output has not yet reached the normal output voltage, the DC voltage output from the AC input mains rectified through this diode supplies power to the load. Once the circuit is working normally and the output voltage reaches the normal level, this diode turns off and stops working.

[0017] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, and these variations still fall within the protection scope of this utility model.

Claims

1. A power supply circuit for a high power factor electric flame furnace, characterized in that: Includes a circuit control module, an input module, and an output module; The circuit control module includes a full-bridge rectifier circuit, which uses a rectifier bridge BD1. The two AC input terminals of the rectifier bridge BD1 are connected to the L line and the N line, respectively. The first output terminal of the rectifier bridge BD1 is connected to a resistor R. CS Connect to pin 3 of the main control chip U, and connect the second output terminal to inductor L. M Connection, inductor L M The other end is connected to the drain of the switching transistor Q1 and the diode D1. The gate of the switching transistor Q1 is connected to pin 8 of the main control chip U, and the source is grounded. The other end of the diode D1 is connected to two resistors R connected in series. FB1 R FB2 and electrolytic capacitor C OUT R FB2 and electrolytic capacitor C OUT The other end is grounded; The input module includes diodes D2 and D3, and capacitor C. IN C BR C M resistance R sense R BR1 R BR2 R M The diode D3 and resistor R sense The first output terminal of BD1 is connected to the diode, and the other end of diode D3 is grounded. The second output terminal of BD1 is connected to diode D2 and capacitor C. IN One end and resistor R BR1 Connect the diode D2 to the capacitor C. OUT Connection, capacitor C IN The other end and resistor R sense Connection, resistor R BR1 and R BR2 Series connection, capacitor C BR and resistance R BR2 The capacitor C is connected in parallel and to pin 4 of the main control chip. M and resistance R M The diode D3 and resistor R are connected in parallel and to pin 2 of the main control chip. sense R BR2 R M and capacitor C BR C M The other end is grounded; The output module includes capacitor C. P C Z C VDD C FB and resistance R Z R FB1 R FB2 Pin 7 of the main control chip is connected to C VDD Connection, capacitor C FB and resistance R Z Connected in parallel and to pin 5 of the main control chip, resistor R Z With capacitor C Z The capacitor C is connected in series. P C Z C VDD C FB The other end is grounded; the electric flame furnace power supply circuit converts low-frequency AC to DC.

2. The power supply circuit for a high power factor electric flame furnace according to claim 1, characterized in that: The switching transistor Q1 is an N-channel MOSFET.

3. The power supply circuit for a high power factor electric flame furnace according to claim 1, characterized in that: The main control chip U adopts a high-performance, continuous conduction mode (CCM) boost constant voltage power factor correction (PFC) controller, which is the front-end regulator in the AC-DC converter.

Images