# US 5,710,463 A · High-voltage breakover diode

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- Number: US 5,710,463 A
- Document ID: US5710463A
- Status: Granted
- Kind: A
- Application number: 08/581,585
- Filed: 1996-01-17
- Granted: 1998-01-20
- Earliest claimed: 1994-05-17
- Assignees: Robert Bosch GmbH
- Inventors: Manfred Vogel; Johann Konrad; Werner Herden; Richard Spitz; Herbert Goebel
- Web page: https://patentgrep.com/patent/US5710463A

## CPC

- H03K 17/78: using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled
- C09J 179/08: Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- F02P 7/035: {without mechanical switching means}
- H03K 17/10: Modifications for increasing the maximum permissible switched voltage
- H10W 90/00: Package configurations
- H03K: PULSE TECHNIQUE (measuring pulse characteristics G01R; modulating sinusoidal oscillations with pulses H03C; transmission of digital information H04L; discriminator circuits detecting phase difference between two signals by counting or integrating cycles of oscillation H03D3/04; automatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses where the type of generator is irrelevant or unspecified H03L; coding, decoding or code conversion, in general H03M)
- C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H)
- F02P: IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES ({anti-pollution means for internal-combustion engines F02B17/00}; specially adapted for rotary-piston or oscillating-piston engines F02B53/12; {ignition of gas turbine plants F02C7/26; ignition of jet propulsion plants F02K9/95; starting of combustion engines F02N9/00}; ignition of combustion apparatus in general, glowing plugs F23Q; measuring of physical variables in general G01; controlling in general G05; data processing in general G06; electrical components in general see Section H; {ignition coils H01F38/12}; sparking plugs H01T13/00)
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10

## Abstract

A high-voltage breakover diode is proposed, which takes on the function of an ignition voltage distributor of an internal combustion engine having solid-state highvoltage distribution. The high-voltage breakover diode comprises a cascade of breakover diode chips, a polyimide layer having recesses in the region of the cathode connection being provided between the individual breakover diode chips produced using planar technology, in each case on the top of the breakover diode chips, and the mechanical and electrical connection of the individual breakover diode chips being effected by means of a conductive adhesive (FIG. 3).

## Claims

### Claim 1

A high-voltage breakover diode comprising:
a plurality of series-connected breakover diode chips, each of the breakover diode chips having a p-n junction covered by an insulation layer, each of the p-n junctions and each of the insulation layers being disposed on a top side of a corresponding one of the breakover diode chips, the breakover diode chips being produced using planar technology;
a first electrode disposed on the top side of each of the breakover diode chips;
a first electrically conductive layer covering each of the first electrodes;
a second electrode disposed on a bottom side of each of the breakover diode chips;
a second electrically conductive layer covering each of the second electrodes;
an electrically insulating plastic layer disposed on the top side of each of the breakover diode chips, each of the electrically insulating plastic layers having a recess in a region of the first electrodes; and
a connecting layer for electrically and mechanically coupling the breakover diode chips.

### Claim 2 (depends on 1)

The diode according to claim 1, wherein each of the electrically insulating plastic layers is photopatterned.

### Claim 3 (depends on 1)

The diode according to claim 1, wherein each of the electrically insulating plastic layers includes a polyimide layer.

### Claim 4 (depends on 3)

The diode according to claim 3, wherein each of the polyimide layers has a thickness between 10 and 200 .mu.m.

### Claim 5 (depends on 1)

The diode according to claim 1, wherein the connecting layer includes a conductive adhesive.

### Claim 6 (depends on 5)

The diode according to claim 5, wherein the adhesive is precurable.

### Claim 7 (depends on 5)

The diode according to claim 5, wherein the adhesive includes a polyimide adhesive containing a metal.

### Claim 8 (depends on 5)

The diode according to claim 5, wherein the adhesive is screen-printed as a thick film.

### Claim 9 (depends on 1)

The diode according to claim 1, wherein the connecting layer includes a soldered connection.