CN209982330U

CN209982330U - Boost control circuit of adjustable positive negative voltage output of multichannel

Info

Publication number: CN209982330U
Application number: CN201822227220.4U
Authority: CN
Inventors: 邓锦扬; 王德祥
Original assignee: Shenzhen City Zhi Zhiqi Technology Co Ltd
Current assignee: Shenzhen City Zhi Zhiqi Technology Co Ltd
Priority date: 2018-12-27
Filing date: 2018-12-27
Publication date: 2020-01-21
Anticipated expiration: 2028-12-27

Abstract

The utility model relates to a show the field, more specifically say, relate to a control circuit that steps up of adjustable positive negative voltage output of multichannel, it includes PWM boost module, benchmark bias voltage module, first adjustable positive voltage output module V1+, the adjustable negative voltage output module V2 of second way, the adjustable positive voltage output module V3+ of third way, the adjustable negative voltage output module V4-of fourth way. The utility model discloses the primary action can provide positive negative voltage output boost control circuit with adjustable multichannel, and every way output voltage accessible adjustment external resistance parameter realizes, the utility model discloses circuit structure is simple, and peripheral device is few, and the debugging is simple, can use on the drive circuit of LCD screen, also can use in the different positive negative voltage class electronic equipment application occasions of multiunit that need high voltage undercurrent.

Description

Boost control circuit of adjustable positive negative voltage output of multichannel

Technical Field

The utility model relates to a positive negative voltage output's boost control circuit technical field is adjustable to multichannel, more specifically says, the utility model discloses mainly be can provide the adjustable positive negative voltage output's of multichannel boost control circuit, every way output voltage accessible adjustment external resistance parameter realizes different positive negative voltage output, the utility model discloses circuit structure is simple, and peripheral device is few, and the debugging is simple, can use on the drive circuit of LCD screen, also can use the electronic equipment application occasions such as the different positive negative voltage of multiunit that needs the high voltage undercurrent.

Background

At present, most liquid crystal display module driving circuits need multiple groups of high-voltage low-current positive and negative driving voltages, such as driving voltages of VGH, VGL, VCOM, AVDD and the like, the driving voltages of each group are different in requirements, the common method is realized by using one or more than one power management chip, the circuit architecture is complex, the cost is high, and the circuit debugging and after-sales maintenance are difficult. The utility model discloses a solve the problem that prior art brought, provide a positive negative voltage output's that multichannel is adjustable boost control circuit, this circuit framework is simple, and peripheral device is few, and is with low costs, and the debugging is simple, can satisfy liquid crystal display module drive voltage high voltage undercurrent requirement. And simultaneously, the utility model discloses also applicable in the electronic product of the high voltage undercurrent that needs the positive and negative voltage output of multiunit.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in that, a positive negative voltage output's boost control circuit is adjustable to the prior art problem is provided.

The utility model provides a positive negative voltage output's of adjustable multichannel control circuit that steps up, it includes PWM step up module, benchmark bias voltage module, first adjustable positive voltage output module V1+, second adjustable negative voltage output module V2-, third adjustable positive voltage output module V3+, fourth adjustable negative voltage output module V4-. The PWM boosting module comprises devices such as U1, L1, R2, C4 and C5 which form a closed loop. The reference bias voltage module comprises a closed loop formed by devices such as C17, C18, C19, C20, D8 and D9. The first adjustable positive voltage output module V1+ comprises a closed loop formed by devices such as D3, R3, R4, C6, C7 and C8. The second adjustable negative voltage output module V2-comprises a closed loop formed by devices such as D1, D2, C1, C2, C3, R1, R11, R12 and C21. The third adjustable positive voltage output module V3+ includes a closed loop formed by devices such as D6, D7, C13, C14, C15, C16, R8, R9, and R10. The fourth adjustable negative voltage output module V4-comprises a closed loop formed by devices such as D4, D5, C9, C10, C11, C12, R5, R6 and R7.

Drawings

The invention will be further explained with reference to the drawings and examples, wherein:

fig. 1 is a schematic diagram of a boost control circuit for multi-path adjustable positive and negative voltage output according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The utility model provides a positive negative voltage output's of adjustable multichannel control circuit that steps up, it includes PWM step up module, benchmark bias voltage module, first adjustable positive voltage output module V1+, second adjustable negative voltage output module V2-, third adjustable positive voltage output module V3+, fourth adjustable negative voltage output module V4-.

The PWM boosting module comprises devices such as U1, L1, R2, C4 and C5 which form a closed loop. The U1 device model is SY7208C is a constant frequency peak current mode asynchronous PWM boost converter, and after a 4-pin enable signal EN receives a control signal high level, a PWM module starts to work to provide high-frequency PWM switching pulse signals for each group of voltage output modules. L1 is an energy storage inductor, C4 and C5 are filter capacitors, and R2 is a pull-up resistor for enabling signals EN.

The reference bias voltage module comprises a closed loop formed by devices such as C17, C18, C19, C20, D8 and D9. D8 is a freewheeling bidirectional Schottky diode, PWM switching pulses pass through a bootstrap capacitor C17 and then reach a pin 3 of D8, a power supply VCC is superposed with the PWM switching pulses through a pin 1 of D8 and then passes through D8, a positive bias voltage VG +, VG + is output, the voltage of the positive bias voltage VG + is about the sum of VCC and V1+, and VG + is filtered by C18 to provide bias voltage VG + for each positive voltage output module. D9 is a freewheeling bidirectional Schottky diode, PWM switching pulse outputs a negative bias voltage VG-after passing through bootstrap capacitors C19 and D9, the voltage of VG-is about-V1 +, VG-is filtered by C20 to provide a bias voltage VG-for each negative voltage output module.

The first adjustable positive voltage output module V1+ comprises a closed loop formed by devices such as D3, R3, R4, C6, C7 and C8. Wherein D3 is a freewheeling schottky diode, and after the PWM switching pulse signal passes through D3, the first adjustable positive voltage V1+ is output, and the magnitude of the output voltage V1+ can be realized by adjusting the parameters of the feedback resistors R3 and R4, and the output voltage can be calculated according to the formula V1+ (0.6 x (1+ R3/R4)). C7, C8 are filter capacitors, and C6 is a front capacitor of a feedback resistor.

The second adjustable negative voltage output module V2-comprises a closed loop formed by devices such as D1, D2, C1, C2, C3, R1, R11, R12 and C21. The D1 is a freewheeling bidirectional Schottky diode, PWM switching pulses are added to a pin 3 of D1 after passing through a bootstrap capacitor C1, meanwhile, a reference bias voltage VG-is divided by R11 and R12 and then superposed to the pin 3 of D1 through a pin 2 of D1, the PWM switching pulses of the pin 3 of D1 and the divided reference bias voltage VG-are superposed and then output a second adjustable negative voltage V2-through a pin 1 of D1, and the output voltage V2-can realize output voltage adjustment by adjusting the voltage division ratio of R11 and R12. C2, C3 are filter capacitors, D2 is a voltage stabilizing diode, and R1 is a load resistor, so that output voltage overshoot is prevented. The output voltage V2-the maximum output voltage is about-2 x V1 +.

The third adjustable positive voltage output module V3+ includes a closed loop formed by devices such as D6, D7, C13, C14, C15, C16, R8, R9, and R10. The D6 is a freewheeling bidirectional Schottky diode, the PWM switching pulse passes through a bootstrap capacitor C13 and then reaches a pin 3 of D6, meanwhile, a reference bias voltage VG + is divided by R9 and R10 and then superposed to a pin 3 of D1 through a pin 1 of D6, the PWM switching pulse of the pin 3 of D6 and the divided reference bias voltage VG + are superposed and then output a third adjustable positive voltage V3+ through a pin 2 of D6, and the output voltage V3+ can realize output voltage adjustment by adjusting the voltage division ratio of R9 and R10. C14, C15 and C16 are filter capacitors, D7 is a voltage stabilizing diode, and R8 is a load resistor, so that overshoot of the output voltage is prevented. The output voltage V3+ is approximately VCC +2 × V1+ at maximum output voltage.

The fourth adjustable negative voltage output module V4-comprises a closed loop formed by devices such as D4, D5, C9, C10, C11, C12, R5, R6 and R7. D4 is a freewheeling bidirectional Schottky diode, PWM switching pulse reaches 3 feet of D4 after passing through a bootstrap capacitor C9, meanwhile, reference bias voltage VG-is superposed to 3 feet of D1 through 1 foot of D4 after being subjected to voltage division through R6 and R7, the PWM switching pulse of the 3 feet of D4 and the reference bias voltage VG-after voltage division are superposed to output a fourth adjustable positive voltage V4-through 2 feet of D4, and output voltage V4-can realize output voltage adjustment by adjusting the voltage division ratio of R6 and R7. C10, C11 and C12 are filter capacitors, D5 is a voltage stabilizing diode, and R5 is a load resistor, so that overshoot of the output voltage is prevented. The output voltage V4-the maximum output voltage is about-2 x V1 +.

Although the present invention has been described in connection with the above embodiments, the scope of the present invention is not limited thereto, and modifications, replacements, and the like to the above members are all within the scope of the claims of the present invention without departing from the concept of the present invention.

Claims

1. A multi-path adjustable positive and negative voltage output boosting control circuit is characterized by comprising a PWM boosting module, a reference bias voltage module, a first path adjustable positive voltage output module V1+, a second path adjustable negative voltage output module V2-, a third path adjustable positive voltage output module V3+ and a fourth path adjustable negative voltage output module V4-; the PWM boosting module comprises devices such as U1, L1, R2, C4 and C5 which form a closed loop; the reference bias voltage module comprises a closed loop formed by devices such as C17, C18, C19, C20, D8 and D9; the first adjustable positive voltage output module V1+ comprises a closed loop formed by devices such as D3, R3, R4, C6, C7 and C8; the second adjustable negative voltage output module V2-comprises a closed loop formed by devices such as D1, D2, C1, C2, C3, R1, R11, R12 and C21; the third adjustable positive voltage output module V3+ comprises a closed loop formed by devices such as D6, D7, C13, C14, C15, C16, R8, R9 and R10; the fourth adjustable negative voltage output module V4-comprises a closed loop formed by devices such as D4, D5, C9, C10, C11, C12, R5, R6 and R7.

2. The boost control circuit of claim 1, wherein pin 6 of the U1 is connected to VCC, pin 4 is connected to enable signal EN, pin 2 is connected to ground, pin 1 is connected to the positive terminal of D3, one terminal of L1, C1, C9, C13, pin 5 is connected to the negative terminal of D3, and pin 3 is connected to one terminal of R3, C6, R4; c4, one end of C5 is connected with VCC and 6 pins of U1, and the other end is connected with ground; one end of R2 is connected with a power supply VCC, the other end is connected with a 4 pin of U1 and is connected to an enable signal EN; l1 has one terminal connected to pin 6 of U1 to supply VCC and the other terminal connected to pin 1 of U1.

3. A multi-channel adjustable positive-negative voltage output boost control circuit according to claim 1, wherein one end of said C17 is connected to pin 1 of U1, and the other end is connected to pin 3 of D8; pin 1 of D8 is connected with power VCC, pin 2 is connected with one end of C18; the other end of the C18 is connected with the ground; one end of the C19 is connected with the 1 pin of the U1, and the other end is connected with the 3 pin of the D9; the 1 pin of D9 is connected with one end of C20, and the 2 pin is connected with the ground; the other end of C20 is connected to ground.

4. A multi-channel adjustable positive-negative voltage output boost control circuit according to claim 1, wherein the positive pole of D3 is connected to pin 1 of U1, and the negative pole is connected to pin 5 of U1; one end of R3 and C6 is connected with the negative electrode of D3, and the other end is connected with the 3-pin of U1; one end of R4 is connected with the 3-pin of U1, and the other end is connected with the ground; one end of C7 and C8 is connected with the negative pole of D3, and the other end is connected with the ground.

5. A multi-channel adjustable positive-negative voltage output boost control circuit according to claim 1, wherein one end of said C1 is connected to pin 1 of U1, and the other end is connected to pin 3 of D1; one end of the anode of D2, C2, C3 and R1 is connected with the 1 pin of D1, the other end of the cathode of D2, C2, C3 and R1 is connected with the ground; the 1 pin of D1 is connected with one end of C21, R11 and R12; the other end of the C21 and R12 is connected with the ground; the other end of R11 is connected to pin 1 of D9.

6. A multi-channel adjustable positive-negative voltage output boost control circuit according to claim 1, wherein one end of said C13 is connected to pin 1 of U1, and the other end is connected to pin 3 of D6; one end of a negative electrode of D7, C16, C15 and R12 is connected with a pin 2 of D6, and the other end of a positive electrode of D7, C16, C15 and R12 are connected with the ground; the 1 pin of D6 is connected with one end of R9, R10 and C14; the other end of the C14 is connected with the ground; the other end of R9 is connected with ground; the other end of R10 is connected to pin 2 of D8.

7. A multi-channel adjustable positive-negative voltage output boost control circuit according to claim 1, wherein one end of said C9 is connected to pin 1 of U1, and the other end is connected to pin 3 of D4; the pin 1 of the D4 is connected with one end of the anode of the D5, C10, C11 and R5; the other ends of the negative electrodes of D5, C10, C11 and R5 are connected with the ground; the 2 pin of D4 is connected with one end of C12, R6 and R7; the other end of the C12 is connected with the ground; the other end of R7 is connected with ground; the other end of R6 is connected to pin 1 of D9.