Circuit for UPS to Hibernate PC
The vast majority of the low-power UPS systems that are currently on the market do not include the functionality necessary to power down the computer before the system powers down by itse…
Know the mission before touching a wire.
Understand what you are making, prepare the right tools, and make the workbench safe.
Project details
Circuit for UPS to Hibernate PC is a electronics project. The vast majority of the low-power UPS systems that are currently on the market do not include the functionality necessary to power down the computer before the system powers down by itse…
- Source pages
- 233-234
- Named parts
- 3
- Build goal
- Working, tested prototype
Tools you need
- Digital multimeter
- Wire stripper and side cutters
- Soldering iron with a fine tip
- Current-limited bench supply
Use eye protection, good lighting, and a clean insulated surface throughout the build.
Safety precautions
- Disconnect every power source before changing a connection.
- Check component polarity, pinout, and supply voltage twice.
- Use a current limit for the first power-up.
- Keep liquids, loose metal, and uninsulated wires away from the bench.
Gather, identify, and understand every part.
Use the standardized inventory, then open What's this? to learn each part's role, advantages, limitations, handling, and specifications.
What's this?Image, role, pros, cons, handling & specifications
NEGATIVE
A named project component whose exact role is defined by the source circuit and build guide.
What it does hereIt performs a documented electrical, control, interface, or construction function in this project.
Buy / compare this part ↗Advantages
- Selected for this project
- Can be checked independently
- Supports modular troubleshooting
Limitations
- Substitutes may differ
- Generic names can hide variants
- Pinouts and ratings vary
Handling
- Compare the received part with the source
- Keep it labelled
- Do not force connectors or adjusters
Specifications to verify
- Use the exact model, value, package, and rating listed for NEGATIVE; similar-looking parts are not always interchangeable.
- Confirm dimensions, ratings, connection method, polarity, and environmental limits.
What's this?Image, role, pros, cons, handling & specifications
CD4060
A semiconductor stage performs switching, amplification, regulation, rectification, or logic.
What it does hereIt controls current or signal flow at a defined point in the circuit.
Buy / compare this part ↗Advantages
- Fast and efficient
- Compact
- Can control larger loads from smaller signals
Limitations
- Pin order varies
- Sensitive to overvoltage and reverse polarity
- May need cooling or bias components
Handling
- Verify the datasheet pinout
- Avoid static and soldering heat
- Check notch, stripe, or flat-face orientation
Specifications to verify
- Use the exact model, value, package, and rating listed for CD4060; similar-looking parts are not always interchangeable.
- Confirm pinout, maximum voltage/current, dissipation, gain or forward voltage, and package.
What's this?Image, role, pros, cons, handling & specifications
LED1 - indicator LED identified in the circuit
An output component turns an electrical control signal into light, sound, motion, switching, or displayed information.
What it does hereIt presents the circuit result or acts on the physical world.
Buy / compare this part ↗Advantages
- Makes system state visible
- Can be tested separately
- Supports clear troubleshooting
Limitations
- Loads may exceed controller current
- Polarity or driver direction can matter
- Inductive loads create voltage spikes
Handling
- Use the documented driver stage
- Check polarity and load current
- Add flyback protection for inductive loads
Specifications to verify
- Use the exact model, value, package, and rating listed for LED1 - indicator LED identified in the circuit; similar-looking parts are not always interchangeable.
- Confirm voltage, current, polarity, interface, driver requirements, and duty cycle.
Connect one verified path at a time.
Explore the named components and standardized signal flow, then use Source Check to verify exact physical pins, values, and topology before applying power.
Trace this circuit.
Circuit for UPS to Hibernate PC: interactive parts, standardized terminals, responsive anchored wires, student explanations, and the original circuit reference in one shared system.
Trace before wiring
Follow power, ground, inputs, processing, and outputs in that order. Never guess a pin from package shape alone.
Connect with power off
Make short, labelled connections and share a common ground only where the schematic requires it.
Inspect every joint
Check continuity, polarity, adjacent shorts, and loose connections before the first power-up.
Open all source diagrams and build views 1 visuals
Confirm the hardware-only control path.
This project does not include firmware in the source. The circuit itself provides the required behaviour.
How to connect
- Match every controller label to the circuit view and source pin map.
- Join grounds before signal wires when separate low-voltage supplies are used.
- Keep motors, relays, pumps, and other loads on a suitable driver and external supply.
Common mistakes
Reversed VCC/GND, board-label versus GPIO-number confusion, missing common ground, and charge-only USB cables.
Troubleshoot
Disconnect loads, continuity-test one path at a time, then test with a current limit.
Software preparation
No IDE, board package, library, or firmware upload is required for this project.
If you add a programmable controller as an extension, document its pin map separately.
How to upload code
The original design is implemented entirely in hardware, so proceed after verifying the circuit and supply.
Assemble, deploy, test, and troubleshoot.
Use the complete source notes in build order, then pass the final checks before calling the project finished.
Build in functional stages
- Power and regulation
- Controller or processing stage
- Inputs and sensors
- Outputs and loads
- Enclosure and strain relief
Power up safely
- Inspect unpowered continuity first
- Apply the lowest safe current limit
- Measure supply rails before signals
- Add one load at a time
- Record expected and actual results
Work from simple to complex
- Confirm power, ground, polarity, and orientation
- Compare each pin with the source
- Test inputs separately from outputs
- Replace only one variable at a time
- Power off before every correction
Follow the documented instructions.
These notes come from this project's source and remain in their original order.
Project overview
Project build noteThe vast majority of the low-power UPS systems that are currently on the market do not include the functionality necessary to power down the computer before the system powers down by itself due to low battery. Some of them have the capability, but in order to use it they need the appropriate software. In this project, we will discuss a "add-on" circuit for uninterruptible power supplies (UPS) that will hybernate a computer automatically before the UPS shuts down due to low battery voltage. There is no need to install any enabling software. Following the comparator IC 741 (IC1) comes a short-duration positive pulse generator that makes use of a 14-stage ripple-carry binary counter/divider and oscillator IC2. Finally, the circuit concludes with a logic level shifter IC2. Because the voltage at the non-inverting (positive) input terminal of IC1 is typically higher than the voltage at the inverting (negative) input, the output of the comparator is also typically higher than the voltage at the inverting (negative) input. This high output from IC1 is
put to use in the process of resetting IC CD4060 (IC2), which is a ripple counter with 14 stages. When the voltage of the UPS battery drops below the value that has been established, the non-inverting terminal voltage of comparator IC1 at pin 3 begins to decrease. In this circuit, when the voltage of the battery drops below 9.5 volts, the voltage at pin 3 of IC1 drops below 3.3 volts, and the output of the comparator at pin 6 goes low. This causes LED1 to light up, which notifies the user that his computer is going to hybernate within the allotted amount of time (around 3 minutes). After three minutes, a high output will be produced at pin 1 of IC2 because of the low voltage level that is present at pin 12 of that component, which enables it to oscillate and causes the counter to begin counting. The high output is utilized to trigger the SCR1, which in turn activates the RL1 relay. Only when the power source for the circuit is manually turned off through S1 will the relay become de-energized. The circuit is constructed on a small printed circuit board and then wired to the terminals of the UPS battery. The voltage needed to activate hibernation in the circuit has been configured to be higher than the cut-off voltage of the UPS. (If the cut-off voltage of the UPS is 9.5 volts, set the voltage level at which hybernation activation is activated to 10 volts.) The circuit is placed within the UPS cabinet. Switch S1 and LED1 are wired up to be on the front panel of the cabinet.
You built Circuit for UPS to Hibernate PC.
You followed the full workflow from understanding the mission to testing the finished project. That is a real engineering achievement - well done.
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