Driving power supply circuit

Abstract

The utility model discloses a driving power supply circuit, and particularly relates to circuit design, the driving power supply circuit comprises an MC1455BD and a dual-channel low-side MOSFET driver UCC27423, a Pin2 of the MC1455BD is connected in series with a capacitor C207, and a Pin2 of the MC1455BD is connected in series with the capacitor C207. The pin Pin6 of the MC1455BD is connected in parallel with the input end of the capacitor C207; and the pin Pin6 is connected in parallel with the pin Pin8 of the MC1455BD, and a resistor R203 and a resistor 205 are sequentially connected in series on the pin Pin6 in the direction from the pin Pin8 to the pin Pin6. According to the utility model, the switch-on and switch-off of the transformer can be adjusted by controlling the switch-on and switch-off of the MOSFETs, and isolation driving is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to circuit design, concretely relates to a drive power supply circuit. BACKGROUND

[0002] At present, the market drive power supply can be externally connected to remote energy-saving control device for dimming control, has lightning protection, overvoltage protection, short-circuit protection and over-temperature protection and the like functions. And according to the different input and output architecture, drive power supply is divided into isolation drive and non-isolation drive, wherein:

[0003] Isolation drive refers to that input and output are electrically connected through transformer, conversion process is electric-magnetic-electric, and there is no connection with ground. Can protect users and operators, prevent electric shock, reduce the insulation requirement of lamp housing;

[0004] Non-isolation drive is that input power is directly added on load after being boosted, without transformer. Isolation drive can protect users and operators, and its main advantages and disadvantages are just opposite to isolation drive power supply, and the advantages are as follows: (1) high conversion efficiency. Non-isolation drive power supply has less energy loss of transformer, and the efficiency of drive power supply above 100W in general can reach more than 94%, while the efficiency of isolation drive power supply is generally about 90%, depending on power, and the greater the power, the higher the heat degree. (2) relatively low cost, small size, easy to design. Compared with isolation drive power supply, non-isolation drive power supply mainly reduces transformer, and is designed with minimum material to achieve the same product function, so that non-isolation drive power supply has great advantage in cost.

[0005] The disadvantages are as follows: (1) low safety. Non-isolation drive power supply directly inputs city power into electronic circuit, and then outputs through electronic components, and input and output are directly connected through electronic components, and load cannot be directly contacted in work, and there is the danger of electric shock. Because of high safety specification requirement for load, the part of non-safety regulation certified material that people can touch and circuit needs to be strengthened insulation. (2) poor anti-interference ability. Non-isolation drive power supply is very sensitive to surge, and has poor suppression capacity, and has great damage to load after power supply anomaly. (3) difficult to realize multi-output. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing a drive power supply circuit, solves how to adopt drive circuit to power supply for load, realizes controllable, isolation and safety problems.

[0007] In order to realize the above object, the utility model provides the following technical scheme: a drive power supply circuit, including MC1455BD and double channel low side MOSFET driver UCC27423, wherein:

[0008] The Pin2 of the MC1455BD is connected with the capacitor C207 in series;

[0009] The Pin6 pin of the MC1455BD is connected in parallel with the input end of the capacitor C207;

[0010] The Pin6 pin is connected in parallel with the Pin8 of the MC1455BD, and the resistor R203 and the resistor 205 are connected in series on the Pin6 pin from the Pin8 to the Pin6 pin direction.

[0011] The pin 4 of the double-channel low-side MOSFET driver UCC27423 is connected with the Pin3 of the MC1455BD, and the pin 2 of the double-channel low-side MOSFET driver UCC27423 is connected in parallel on the connection.

[0012] As preferred, the pins on the MC1455BD are:

[0013] Pin1, ground;

[0014] Pin2, trigger input of the timer;

[0015] Pin3, output of the timer;

[0016] Pin4, reset pin, so that the MC1455BD returns to the initial state;

[0017] Pin5, control voltage input;

[0018] Pin6, threshold input;

[0019] Pin7, discharge pin;

[0020] Pin8, positive power voltage input.

[0021] As preferred, the pins on the double-channel low-side MOSFET driver UCC27423 are:

[0022] Pin1, enable input of driver A;

[0023] Pin2, input A;

[0024] Pin3, ground;

[0025] Pin4, driver input B;

[0026] Pin5, driver output B;

[0027] Pin6, power voltage input;

[0028] Pin7, driver output A;

[0029] Pin 8, enable input for driver B.

[0030] As preferred, the Pin 8 of the dual-channel low-side MOSFET driver UCC27423 is connected in parallel to the Pin 1 of the dual-channel low-side MOSFET driver UCC27423.

[0031] The Pin 1 of the dual-channel low-side MOSFET driver UCC27423 is connected in parallel to a circuit composed of a resistor R201 and a capacitor C201, and the coupling point of the Pin 1 is located on the connecting line between the resistor R201 and the capacitor C201.

[0032] As preferred, two LED lamp circuits and an N-channel power MOSFET tube IRLR3410PBF are further included, and the N-channel power MOSFET tube IRLR3410PBF is coupled to the two LED lamp circuits.

[0033] The N-channel power MOSFET tube IRLR3410PBF includes a pin G, the Pin 5 of the dual-channel low-side MOSFET driver UCC27423 is connected to the pin G, and a resistor R204 is connected in series to the connection.

[0034] As preferred, the Pin 7 of the dual-channel low-side MOSFET driver UCC27423 is connected in parallel to the Pin 5 of the dual-channel low-side MOSFET driver UCC27423.

[0035] In the above technical solution, the driving power supply circuit provided by the utility model has the following beneficial effects: the input end and the output end of the isolation driving power supply are separated from each other by an isolation transformer, the input end and the output end are not grounded, common mode, surge and other interference paths can be effectively cut off, in addition, a lightning protection circuit composed of a voltage-dependent resistor and a gas discharge tube and other elements at the front end of the isolation driving power supply is arranged, so that the surge voltage of the input end cannot be directly transmitted to the output end, thereby effectively preventing the invasion of the surge voltage and protecting the LED light source at the rear end from being damaged. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0037] Figure 1 The circuit diagram provided by the utility model embodiment. DETAILED DESCRIPTION

[0038] In order to make the technical scheme of the utility model better understood by the skilled in the art, the utility model will be further described in detail below in conjunction with the drawings.

[0039] As shown in Figure 1 A driving power supply circuit, comprising MC1455BD and double-channel low-side MOSFET driver UCC27423.

[0040] Further, in conjunction with Figure 1 It can be known that the circuit in the embodiment further comprises two LED lamp circuits and N-channel power MOSFET tube IRLR3410PBF, the N-channel power MOSFET tube IRLR3410PBF is coupled with the two LED lamp circuits, and the N-channel power MOSFET tube IRLR3410PBF comprises a pin G (gate), the pin 5 of the double-channel low-side MOSFET driver UCC27423 is connected to the pin G, and a resistor R204 is connected in series on the connection, and the pin 7 of the double-channel low-side MOSFET driver UCC27423 is connected in parallel to the pin 5 of the double-channel low-side MOSFET driver UCC27423.

[0041] It should be noted that the pins of the IRLR3410PBF in the above embodiment comprise:

[0042] Source (S): this is the reference point of the UCC27423, and is usually connected to the ground or reference ground of the circuit.

[0043] Drain (D): this is the output end of the UCC27423, and the current flows out from here.

[0044] Gate (G): the switch state of the UCC27423 can be controlled through this pin, and the change of the gate voltage will cause the change of the drain current, and the current flows from the drain to the source when it is turned on.

[0045] The pins on the MC1455BD in the above embodiment comprise:

[0046] Pin1, ground. Provides a reference point for the loop of the timer, and is usually connected to the common ground of the circuit.

[0047] Pin2, trigger input of the timer. In the stable mode, this pin is usually not used for triggering, because the timer is free-running in this mode.

[0048] Pin3, output of the timer. In the stable mode, output 1 will generate a periodic square wave signal, and the frequency and duty cycle are determined by the external resistance and capacitance connected to the pin 6 and the pin 4.

[0049] Pin 4, Reset pin. In the astable mode, if this pin receives a low signal, the outputs of both timers will be reset to low, stopping oscillation.

[0050] Pin 5, Control voltage input. In the astable mode, this pin is used to set the threshold voltage of the timers, which in turn affects the output duty cycle.

[0051] Pin 6, Threshold input. In the astable mode, when the control voltage is higher than this pin, the output will be suppressed. In the monostable mode, this pin is usually not used.

[0052] Pin 7, Discharge pin. This pin is connected to the internal discharge transistor of IRLR3410PBF, which is used to quickly discharge the external capacitor, shortening the delay period.

[0053] Pin 8, Positive supply voltage input. Provides the required operating voltage for the timers inside IRLR3410PBF.

[0054] On the dual-channel low-side MOSFET driver UCC27423 in the above embodiment:

[0055] Pin 1, Enable input for driver A, with logic-compatible threshold and hysteresis, internally pulled up to VDD, active high, can be left open for standard operation;

[0056] Pin 2, Input A, with logic-compatible threshold and hysteresis. If not used, it should be connected to VDD or GND, not left floating;

[0057] Pin 3, Ground, should be as close as possible to the source of the power MOSFET being driven;

[0058] Pin 4, Input B, with logic-compatible threshold and hysteresis. If not used, it should be connected to VDD or GND, not left floating;

[0059] Pin 5, Driver output B, capable of providing up to 4A of drive current to the gate of a power MOSFET;

[0060] Pin 6, Supply voltage input, supply voltage range is 4V to 15V;

[0061] Pin 7, Driver output A, capable of providing up to 4A of drive current to the gate of a power MOSFET;

[0062] Pin 8, Enable input for driver B, with logic-compatible threshold and hysteresis, internally pulled up to VDD, active high, can be left open for standard operation.

[0063] Further, in combination with Figure 1As shown, the Pin2 of the MC1455BD is connected in series with a capacitor C207, and the Pin6 pin of the MC1455BD is connected in parallel with an input end of the capacitor C207. The Pin6 pin of the MC1455BD is connected in parallel with the Pin8 of the MC1455BD, and a resistor R203 and a resistor 205 are connected in series on the Pin6 pin of the MC1455BD in the direction from the Pin8 of the MC1455BD to the Pin6 pin of the MC1455BD. The pin 4 of the dual-channel low-side MOSFET driver UCC27423 is connected with the Pin3 of the MC1455BD, and the pin 2 of the dual-channel low-side MOSFET driver UCC27423 is connected in parallel with the connection. The pin 8 of the dual-channel low-side MOSFET driver UCC27423 is connected in parallel with the Pin1 of the dual-channel low-side MOSFET driver UCC27423. The pin 1 of the dual-channel low-side MOSFET driver UCC27423 is connected in parallel with a circuit in which a resistor R201 and a capacitor C201 are connected in series, and the coupling point of the pin 1 is located on the connection line between the resistor R201 and the capacitor C201.

[0064] In the above technology, the MC1455BD is a single-chip timer integrated circuit, which can be used as an oscillator in a stable mode to generate a continuous square wave output. The output alternates between high and low levels, and the frequency and duty cycle can be set by external resistors and capacitors to generate a 500k pulse signal, with the capacitor voltage oscillating between 1 / 3Vcc and 2 / 3Vcc, and the duty cycle can be changed by changing the proportion of these resistors. The output signal is provided to the input pin 6 of the dual-channel low-side MOSFET driver UCC27423 chip, which provides a 4A peak pull current and a 4A peak fill current to provide the most needed efficient MOSFET drive in the Miller flat region. In order to drive the N-channel power MOSFET tube IRLR3410PBF. The on-off of the tube is controlled by the positive and negative of the gate current, when the signal is positive, the tube is turned on, when the signal is negative or zero, the tube is turned off, thereby controlling the on-off of the primary side power supply of the transformer, forming an open-loop forward power topology as a DC / DC isolation converter. The transformer secondary side output is rectified and filtered to the load.

[0065] The above only describes some exemplary embodiments of the present application by way of illustration, and it is needless to say that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present application. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present application.

Claims

1. A drive power supply circuit characterized by comprising: MC1455BD and dual channel low side MOSFET driver UCC27423, wherein: Pin2 of the MC1455BD is connected in series with a capacitor C207; Pin6 of the MC1455BD is connected in parallel to an input end of the capacitor C207; Pin6 is connected in parallel to Pin8 of the MC1455BD, and a resistor R203 and a resistor R205 are connected in series between Pin8 and Pin6; Pin4 of the dual channel low side MOSFET driver UCC27423 is connected to Pin3 of the MC1455BD, and Pin2 of the dual channel low side MOSFET driver UCC27423 is connected in parallel to the connection.

2. A driving power supply circuit according to claim 1, wherein Pins on the MC1455BD: Pin1 is a ground wire; Pin2 is a trigger input of a timer; Pin3 is an output of the timer; Pin4 is a reset pin, so that the MC1455BD returns to the initial state; Pin5 is a control voltage input; Pin6 is a threshold input; Pin7 is a discharge pin; Pin8 is a positive power supply voltage input.

3. The driving power supply circuit according to claim 1, wherein Pins on the dual channel low side MOSFET driver UCC27423: Pin1 is an enable input of driver A; Pin2 is an input A; Pin3 is a ground wire; Pin4 is a driver input B; Pin5 is a driver output B; Pin6 is a power supply voltage input; Pin7 is a driver output A; Pin8 is an enable input of driver B.

4. The driving power supply circuit according to claim 1, wherein Pin8 of the dual channel low side MOSFET driver UCC27423 is connected in parallel to Pin1 of the dual channel low side MOSFET driver UCC27423; Pin1 of the dual channel low side MOSFET driver UCC27423 is connected in parallel to a circuit composed of a resistor R201 and a capacitor C201, and the coupling point of Pin1 is located on the connection line between the resistor R201 and the capacitor C201.

5. The driving power supply circuit according to claim 1, wherein Two LED lamp circuits and an N-channel power MOSFET tube IRLR3410PBF are further included, and the N-channel power MOSFET tube IRLR3410PBF is coupled to the two LED lamp circuits; The N-channel power MOSFET tube IRLR3410PBF includes a pin G, and Pin5 of the dual channel low side MOSFET driver UCC27423 is connected to the pin G, and a resistor R204 is connected in series to the connection.

6. The driving power supply circuit according to claim 1, wherein Pin7 of the dual channel low side MOSFET driver UCC27423 is connected in parallel to Pin5 of the dual channel low side MOSFET driver UCC27423.

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