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Transistor time relay circuit diagram

Published:2011/4/29 5:10:00 Author:Rebekka | Keyword: Transistor time relay

Transistor time relay circuit diagram. (View)

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Single-end forward converter circuit with RC and diode clamping circuit

Published:2011/4/21 21:37:00 Author:May | Keyword: Single-end, forward converter, RC and diode clamping

Single-ended forward converter has with removing magnetic winding and diode clamping circuit. Above which we talked about is the one with removing magnetic winding. The diagram shows single-end forward converter circuit with RC and diode clamping circuit. After VTl is cut off, winding N1 and VD3, R, C constitute a single-ended fly-back converter, the magnetizing current IM is attenuated by VD3, the reverse polarity voltage of N1 is superimposed on the input voltage U1 and applied between the emitters of VTl, that is Uce1 = Ui + Uc. Obviously, when U1 is greater than Uc, the cut-off time, toff will be less than on-time ton, that is the biggest turn-on pulse width can exceed half of the period. The conduction pulse width allows more, which can get a larger power output. The downside is that VTl will bear higher voltage, excitation energy will be consumed in resistor R. (View)

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TOPSwitch--Ⅱ

Published:2011/4/21 21:08:00 Author:May

TOPSwitch--Ⅱ

Pin arrangement of TOPSwitch --Ⅱ is shown in the diagram. It has three kinds of package. Among them, TO-220 package has heating panel and belongs to typical three-terminal device. Its shape is the same as 7800 series three-terminal linear regulators. DIP - 8 and SMD-8 package both has 8-pin package, but can be reduced to three; difference between the two is DIP-8 can be equipped with 8 pin IC socket, SMD-8 is surface patch and do not need to punch welding. Three pins of TOPSwitch - Ⅱ are control terminal C (Con-trol), source S (Source), drain D (Drain). TOPSwitch - Ⅱ internal block diagram is shown in below, it mainly includes 10 parts: (1) control voltage source; (2) band gap voltage reference; (3) oscillator; (4) shunt regulator / error amplifier; (5) pulse-width modulator; (6) gate driver stage and output stage; (7) over-current protection circuit; (8) Overheat protection and power-on reset circuit; (9) shutdown / auto-restart circuit; (10 ) high-voltage current source. In the diagram, Zc is control side of the dynamic impedance; RE is error voltage detection resistor; RA and CA make up low-pass filter with 7kHz cut off frequecny. The basic principle of TOPSwitch - Ⅱ is to use the feedback current Ic to adjust the duty cycle D, so as to achieve the purpose of regulation. (View)

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Nickel-cadmium battery charge protection circuit diagram

Published:2011/4/29 4:20:00 Author:Rebekka | Keyword: Nickel-cadmium battery, charge protection

Nickel-cadmium battery charge protection circuit diagram
Nickel-cadmium rechargeable battery protection circuit is shown as below. The charging part is composed of D1, D2, R2 and BG1. The charge protection circuit is composed of BG2 and R1. When the nickel-cadmium batteries are charging, light emitting diode LED will be lighten. It indicates charging is normal. If the battery polarity is reversed, base BG2 will be negative potential, BG2 stops, BG1 the base potential will be raised, BG1 stops. It will not charge for nickel-cadmium battery, LED will not lit. It indicates the battery polarity is reversal. (View)

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Centigrade thermometre circuit

Published:2011/4/28 21:59:00 Author:Nicole | Keyword: centigrade thermometre

Centigrade thermometre circuit
SL134 is three terminal type IC, it is used as temperature sensor. The measuring range is -55~+125℃, its exterior has two kinds: metal package and plastic package. The work voltage range of V+~V- is V±=0.9~30.0V, the current I+=Is+I-, Is=0.01~5.00mA, I+/I-=14~26, the maximum allowable value between R-V is 5V, the maximum allowable power consumption PD=200mW. Under the normal situation, the R-V voltage value temperature factor is about +227μV/K. In this circuit, Ci is used to prevent SL134 self-excited, C2 and C3 are used to 5GOP-07 power supply decoupling, 5G1403 is as the core to form 5GM14433 three and a half digital display voltmeter. To change R3 or R6 then Vx will change in relation to the temperature with the proportion of 10mV/℃, to change Q1 can make Vx=0V when T=0℃. (View)

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Lithium ion battery charging circuit diagram

Published:2011/4/29 4:03:00 Author:Rebekka | Keyword: Lithium ion battery charging

Lithium ion battery charging circuit diagram
Lithium-ion battery charging circuit is shown as above. When it starts to charge. The battery voltage is below 8.4V, IC1's output has no output. Q2 off, LM317 work in the constant current output. When the battery voltage is increased to 8.4V, Q2 turns on, Q2 controls ADJ-side, so that the output voltage of IC2 significant declines and make the charge current maintain a very small value and the pool in a floating state. (View)

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Buick Century car HVAC system circuit diagram(8)

Published:2011/4/29 4:03:00 Author:Nicole | Keyword: Buick Century, car, HVAO system

Buick Century car HVAC system circuit diagram(8)
HVAO conreol assembly, vacuum solenoid valve, former LH and later temperature actuator(CJ4). (View)

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Shanghai GM Buick commercial vehicle(GL8) remote control latch circuit diagram(3)

Published:2011/4/29 4:09:00 Author:Nicole | Keyword: Shanghai GM Buick, commercial vehicle, remote control latch

Shanghai GM Buick commercial vehicle(GL8) remote control latch circuit diagram(3)
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Shanghai GM Buick commercial vehicle(GL8) remote control latch circuit diagram(2)

Published:2011/4/29 4:10:00 Author:Nicole | Keyword: Shanghai GM Buick, commercial vehicle, remote control latch

Shanghai GM Buick commercial vehicle(GL8) remote control latch circuit diagram(2)
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Buick Regal car air condition system GS3.0,GS+ circuit diagram(2)

Published:2011/4/29 4:13:00 Author:Nicole | Keyword: Buick Regal, car, air condition system

Buick Regal car air condition system GS3.0,GS+ circuit diagram(2)
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Buick Regal car air condition system GS3.0,GS+ circuit diagram(1)

Published:2011/4/29 4:12:00 Author:Nicole | Keyword: Buick Regal, car, air condition system

Buick Regal car air condition system GS3.0,GS+ circuit diagram(1)
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Shanghai GM Buick commercial vehicle(GL8) remote control latch circuit diagram(1)

Published:2011/4/29 4:09:00 Author:Nicole | Keyword: Shanghai GM Buick, commercial vehicle, remote control latch

Shanghai GM Buick commercial vehicle(GL8) remote control latch circuit diagram(1)
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Analog rocket emitting electronic game circuit diagram

Published:2011/4/29 4:04:00 Author:Ecco | Keyword: Analog , rocket emitting, electronic game

Analog rocket emitting electronic game circuit diagram
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Shanghai GM Buick commercial vehicle(GL8) airbag circuit diagram(1)

Published:2011/4/29 4:07:00 Author:Nicole | Keyword: Shanghai GM Buick, commercial vehicle, airbag

Shanghai GM Buick commercial vehicle(GL8) airbag circuit diagram(1)
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Shanghai GM Buick commercial vehicle(GL8) airbag circuit diagram(2)

Published:2011/4/29 4:07:00 Author:Nicole | Keyword: Shanghai GM Buick, commercial vehicle, airbag

Shanghai GM Buick commercial vehicle(GL8) airbag circuit diagram(2)
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Battery fast charge circuit composed of BQ2002 battery fast charge control integrated circuit

Published:2011/4/27 9:16:00 Author:Nicole | Keyword: battery fast charge

Battery fast charge circuit composed of BQ2002 battery fast charge control integrated circuit
Transformer, diode and steady voltage IC7805 provide this circuit with +5V power voltage, the power voltage is divided by R5, R6 then transported to the BAT terminal of chip, it provides sample voltage. The resistance inputed from reststance partial pressure network to BAT terminal should not be lower than 200kΩ. When TM terminal is grounding, the fast charge rate is 1C, the fast charge supplementary time is 80min. (View)