DL24P Schematic Diagram [PDF]

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DL24P Load Tester Power Supply 8-12 vdc 12V

8-12 vdc

STPS41H100CG D1 A2

C7

Current Control 0v to 2.161v

PB1 PWM

R4

R5

10k

10k

R3 3.3k

C2

0.1uF

1

Buffer 5

+

Vcc

-

Vee

U1

4

LM321

C3

3

0.1uF

Comps for PWM digital line not pulling to ground

0.1uF

R10

68k R12 3.3k

2

R13 150k

Current Control 0v to 0.100v

1 R6

0.1uF

100

uC DAC has only 6 bits so instead uses PWM timer for higher resolution control.

Integrator

C4

PWM filter 0v to 2.161v

R11 C5

0.1uF

100

HOT

100V 2x 20amps

3.3V

3

5

+

Vcc

-

Vee

Q1

10k

1k

+ -

2

C1 0.1uF

V+

J5 1 2

V-

FAN

Current Regulator Feedback 3.3v Reg.

R1a 0.010

ME6203A-3.3V 3.3V U3 Vout 3 Vin C10 C11

12V

R9

Q2

IRFP260 Q1 HOT

R2

4

R8 68k

R7 10k

(reverse protection) K

U2

LM321

A+

12V

A1

T NTC1 10k @ 25degC

R1b 0.010

2

Gnd 1

15uF

Out Monitor

A-

15uF

Current Shunt 0.005 ohms

A+ load MOSFET source

Current Sensing

Current Sensing

Current Sensing

0.1uF

3.3V

3.3V

4800 baud PD0 UART_Rx UART_Tx PD1 R25 1k

VC28 0.1uF

R26 1k

C24

C25

2.2uF

0.1uF

C31 0.1uF

R31 10k

TxD D2

V+

1 2 3 4 n.c. 5 6 7 8

R32 10k RxD D3

UART LED

U5

Gnd TxD RxD V3 UD+ UDXI XO

R27 150k

VBus +5v C32

16

Vcc R232_En 15 14 RTS_b 13 DTR_b 12 DCD_b RI_b 11 DSR_b 10 CTS_b 9

n.c. n.c. n.c. n.c. n.c. n.c. n.c.

0.1uF

3.3V

X2

C29 0.1uF

C33

PB1 PWM

SWD Programming/Debug DVcc Gnd SWDIO SWCLK RESET_b

1 2 3 4 5

C34

12.00 MHz

20pF

20pF

USB Micro Jack

U6 3.3V C43

C42

R41 10k

2.2uF

4.7uF

Reset_b C41 0.1uF

R42 10k

C44 0.1uF

test

1 2 3 4 5 6 7 8 9 10 11 12 13 14

VBus +5v DD+ n.c. ID GND

HC32F030E8PA (64K FLASH, 8K SRAM)

TSSOP28 package Boot0 VCAP1 PC14/32K_In SWCLK/PA14 PC15/32K_Out SWDIO/PA13 PA12 PD0 Tx (uses software ‘bit bang’ UART) 4800 baud PA11 PD1 Rx NRST USART1_RX/PA10 VDDA USART1_TX/PA9 PA8 PA0/ADC_IN0 DVcc PA1 ARM Cortex M0+ DVss PA2 Microcontroller PA3 PB2 PA4/SPI0_CS TIM6/PB1 PA5/SPI0_SCK PB0 PA6/SPI0_MISO SPI0_MOSI/PA7

28 27 26 25 24 23 22 21 20 19 18 17 16 15

R44 R45

120 120

- button

3.3V

3.3V

Setup button

Serial port / DFU programming DVcc Gnd RxD TxD Boot_b

R43 22k* Setup button SW1 - button SW2

U7

3.3V

JDY-23

n.c. 3 n.c. n.c. 4 Out1

R54

PA9/U1Tx PA10/U1Rx

Int5

Int4

t2 EIn

10

11

12

13

14

15

16

n.c.

n.c.

n.c.

n.c.

Int3 18 n.c. AL ED R52

9

n.c.

BT Status LED

R53 120

TxD 19

n.c.

D5

RxD 20

120

n.c. 7 Int7 t3 Ou n.c. 8

EInt1 21 n.c.

cc2541

6 Stat

R51 47

PwrC 22 n.c.

BlueTooth Module

n.c. 5 Out2

n.c.

120

D4

‘S4’ SD102AWS

Reset 23 n.c.

n.c.

Buzzer

R50

LCD

Start button SW4

Gnd 24

1 Vcc

n.c. 2 n.c.

Out6

Spkr1

PA06, SPI0_MISO 3.3v 3.3V 3.3v n.c. PA07, SPI0_MOSI PA04, SPI0_CS PB00, GPIO PA05, SPI0_SCK PC15 GPIO Gnd

1 2 3 4 5

Start button + button

Out7

R24 35k*

1 Osc_O Osc_I 16 n.c. 2 PF DVdd 15 14 3 n.c. DGnd QF 4 AVdd Rx/Rst_N 13 5 Ain2_P Tx 12 6 Ain2_N Ref_V 11 7 Ain2_P Ain3_N 10 8 Ain2_N Ain3_P 9 C23

UART to USB CH340G

VBus +5v

Int6

R23 42k*

20pF

t4 Out5

Ext Temp Thermistor 1 2 Gnd

NTC2 10k @ 25degC

15uF

0.1uF

C27

Ou

C21

C22

3.5798 MHz

20pF

Load Voltage Remote Sensing

J5

R21 100

C26

R22 10

0.1uF

Load Voltage Remote Sensing

X1

3.3V

C20

Fan Control

PC14

(Utility Smart Meter chip)

R20 100

Ext Temp Sensor

MOSFET Temp Sensor

PA00/ADC_IN1

RENERGY RN8209C Three input Sigma Delta ADC

17

47

D6 BT Active

+ button SW3

1 2 3 4 5