AnHui JuanKuang Electric Co., Ltd. has manufactured film capacitors in Ningguo, Anhui Province since 1995, and our High Voltage Microwave Oven Capacitors Manufacturers range supplies the CH85 capacitor that sits inside the magnetron supply of a microwave oven. We produce the metallized film, wind and weld the elements, assemble and test the finished units inside one plant, so an appliance platform can be sourced from a single production chain instead of being assembled from bought-in parts.
The range is built for voltage multiplication and energy storage in half-wave doubler circuits, where the capacitor works with the high-voltage transformer and rectifier diode to raise the secondary voltage to the level the magnetron needs. Because the capacitor sets both the doubler output and the unit-to-unit consistency of cooking power, we treat every enquiry as a configuration task rather than a catalogue lookup.
Our Position in the Microwave Oven Capacitor Range
More than 30 years of focused film capacitor work sits behind this product family. Our plant covers metallized film production, capacitor winding, automatic welding, spray coating, assembly and automated testing, with an annual output of 40 million capacitors across a 53,000 m² production area and a 2,000 m² research and test centre. Microwave oven capacitor development began in 2014, with samples and trial production supplied to appliance makers including Midea, Galanz and Samsung.
- Integrated film supply — metallizing runs on German coating equipment, so dielectric film and finished capacitor are controlled under one quality system.
- Winding capacity — Swiss fully automatic winding machines support both series production and drawing-based custom builds.
- Export experience — components supplied to GE, Electrolux, Samsung and Whirlpool, with shipments to more than 30 countries.
- Compliance base — ISO 9001 and ISO 14001 systems, with UL, VDE, CE and CQC certification held across the relevant product families.
The CH85 Capacitor in a Magnetron Supply Circuit
In a typical domestic or commercial microwave oven, the mains is stepped up by the transformer, rectified by a high-voltage diode, and smoothed by the capacitor working as a doubler. The capacitor charges on one half-cycle and adds its stored voltage on the next, delivering roughly twice the transformer secondary voltage to the magnetron. Cooking power, warm-up behaviour and the stability of the power setting all depend on that capacitance value holding steady over temperature and life.
Self-healing metallized polypropylene is the standard dielectric for this duty: a local breakdown clears itself instead of shorting the element, losses stay low at the operating frequency, and capacitance drift over the appliance lifetime is limited. Our CH85 High Voltage Capacitor for Microwave Oven is the standard build for this position in the circuit.
CH85 High Voltage Capacitor for Microwave Oven
Sealed metal-can construction for 50/60 Hz doubler circuits, with metallized polypropylene element, discharge resistor option, quick-connect or lead-out terminals and chassis mounting bracket. Capacitance, rated voltage, can dimensions and packaging are configured to the appliance platform.
The same film platform supports the wider Metallized Film Capacitors family, including motor-run and Power Capacitors built on comparable winding, coating and test equipment. Where a project needs a matched set of components, we coordinate the capacitor specification with the transformer and diode supplier's interface data.
Configuration Variables We Fix Before Production
| Configuration variable |
What it controls in the appliance |
Information we need from you |
| Rated capacitance |
Charge delivered per half-cycle, and therefore magnetron output and cooking power |
Target wattage, transformer secondary voltage, magnetron model |
| Rated voltage |
Dielectric margin against doubler peaks, surge and repeated switching |
Mains class, transformer output, expected transient environment |
| Capacitance tolerance |
Unit-to-unit spread of cooking power on the assembly line |
Acceptable power window, measurement method and test frequency |
| Dissipation factor and insulation resistance |
Self-heating and leakage at operating temperature |
Duty cycle, ambient class, continuous or intermittent use |
| Discharge resistor |
Residual charge on the terminals after switch-off |
Safety requirements of the destination market and service policy |
| Terminals and lead-out |
Harness fit and assembly time on your line |
Tab size and type, lead length, terminal orientation, connector drawing |
| Can, bracket and mounting |
Cavity space, clearance to the chassis and vibration resistance |
Cavity drawing, height limit, bracket or clamp style, fixing points |
| Marking and packaging |
Line-side identification and inbound handling |
Label content, barcode format, carton quantity and pallet pattern |
Materials, Terminals and Mechanical Fit
CH85 capacitors are built around a metallized polypropylene element, wound, welded and housed in a sealed metal can so the dielectric stays dry and stable through storage and appliance life. Electrode metallizing, film thickness and winding tension are handled in-house, which is what allows us to hold a capacitance window rather than simply sorting finished units.
- Dielectric — self-healing metallized polypropylene for low loss and controlled drift at 50/60 Hz.
- Termination — quick-connect tabs, screw terminals or insulated leads, positioned for your harness route.
- Mechanical — can diameter, height and bracket configured to the cavity envelope, with clearance for the diode and transformer leads.
- Field handling — mount on the bracket without stressing the terminals, keep the specified torque on screw versions, and replace the capacitor together with the rectifier diode where the service procedure requires it.
Quality Control, Testing and Compliance Evidence
Process control follows a fixed sequence: raw material inspection, process parameter control at metallizing, winding, welding and coating, in-line inspection, semi-finished testing, finished product inspection and shipment quality control. Finished capacitors are 100% inspected against the agreed specification before packing, and the 2,000 m² test centre supports capacitance, dissipation factor, insulation resistance, voltage withstand and endurance checks.
- ISO 9001 quality management and ISO 14001 environmental management systems.
- UL, VDE, CE and CQC certification held on the relevant capacitor families, supporting North American and European market access.
- RoHS, REACH, TSCA and POPs compliance across our capacitor products, with a published life-cycle compliance statement.
- Over 90 patents, including 16 invention patents, behind winding, coating and test process development.
OEM/ODM Customization and Development Support
Customization is our core business rather than an exception. We develop from your drawing or a physical sample, and capacitance, rated voltage, can dimensions and packaging can all be set to the platform. For a new oven programme, our engineers work from the magnetron and transformer data to propose a starting capacitance and voltage class, then confirm it against prototype builds and your acceptance test.
Typical custom work includes alternate terminal layouts for automated assembly, bracket changes for a revised cavity, tighter capacitance sorting for premium models, and private-label marking for distributor stock. First articles, dimension reports and test data are prepared alongside the production samples.
Information We Use to Configure Your Solution
- Appliance platform, model reference and whether the build is new production or a service replacement.
- Magnetron rating, transformer secondary voltage and target cooking power, plus mains voltage and frequency for the destination market.
- Required capacitance and tolerance window, with the test method used on your line.
- Cavity drawing or sample showing available height, can diameter and bracket fixing points.
- Terminal type, tab size, lead length and orientation; discharge resistor requirement.
- Certification, marking and documentation needs, annual volume and packaging format.
Packaging, Delivery and Documentation
Cartons, inner trays and pallet patterns are set to your inbound handling, with label content agreed before the first shipment. Shipments move by sea through Ningbo or Shanghai, with air freight through the same airports when a programme needs faster replenishment. T/T is the standard payment route, and L/C terms can be negotiated for larger orders.
As a film capacitor factory in China serving more than 1,000 customers worldwide, we issue the specification sheet, inspection records and compliance declarations with each order, and enquiries receive a technical reply within 12 hours.
Frequently Asked Questions
What does the CH85 capacitor do in a microwave oven?
It works with the high-voltage transformer and rectifier diode as a voltage doubler, storing charge on one half-cycle and adding it to the next so the magnetron receives the high DC voltage it needs. It also stabilises cooking power, because the delivered energy depends directly on the capacitance value.
Can you build to a capacitance and voltage outside your standard list?
Yes. Capacitance, rated voltage, can dimensions and packaging are all customizable, and we develop from drawings or samples under OEM/ODM terms. Send the magnetron rating, transformer data and cavity drawing, and we will propose a configuration with the matching mechanical envelope.
Is a discharge resistor included?
It is a configuration choice. Where the destination market or your service procedure requires the terminals to be bled after switch-off, we build the resistor into the capacitor and state it on the specification sheet.
Which approvals support export to North America and Europe?
Our systems are certified to ISO 9001 and ISO 14001, and the relevant capacitor families hold UL, VDE, CE and CQC certification. All capacitor products comply with RoHS, REACH, TSCA and POPs requirements, and the applicable certificates are supplied with the order documentation.
How is quality verified before shipment?
Every process stage has its own inspection gate, from incoming film through winding, welding and coating to assembly. Finished capacitors are 100% inspected against the agreed specification at final test, and shipment quality control is completed before the cartons are released.
How quickly will we receive a technical response?
Inquiries are answered within 12 hours. A complete reply needs the working point, mechanical envelope and approval requirements, so a drawing or existing sample shortens the path to a confirmed proposal.
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