DC power supply device adapted to operate with an AC power supply or with a car battery via a cigarette lighter

• US 5,901,056 A
• Filed: 12/03/1997
• Issued: 05/04/1999
• Est. Priority Date: 12/03/1997
• Status: Expired due to Fees

• Current Assignee: Sheng-Chuan Hung
• Original Assignee: Sheng-Chuan Hung
• Inventors: Hung, Sheng-Chuan
• Primary Examiner(s): BERHANE, ADOLF D
• Application Number:
  US08/984,374
• Time in Patent Office: 517 Days
• Field of Search: 363/37, 363/142, 363/144, 363/146, 307/64, 307/66
• US Class Current: 363/142
• CPC Class Codes: H02J 2207/20 Charging or discharging characterised by the power electronics converter
• CPC Class Codes: H02J 2310/46 for ICE-powered road vehicles
• CPC Class Codes: H02J 7/0063 with circuits adapted for supplying loads from the battery
• CPC Class Codes: H02J 7/00711 with introduction of pulses during the charging process
• CPC Class Codes: H02J 7/00712 the cycle being controlled or terminated in response to electric parameters

Abstract

A DC power supply device which includes a housing, an AC plug moved in and out of the housing and adapted to obtain AC power supply from a city power supply outlet, a DC plug moved in and out of the housing and adapted to obtain DC power supply from a socket for cigarette lighter of a car, a circuit board mounted inside the housing and adapted to process AC power supply obtained from the AC plug or DC power supply obtained from the DC plug into desired-DC power supply, and a DC output connector connected to the circuit board for DC output.

Claims

1. A DC power supply device comprising:

a housing, said housing comprising a bottom shell and a top cover shell covered on said bottom shell;

a circuit board mounted inside said housing, said circuit board comprising a first EMI (electromagnetic interference) filter, a HV (high voltage) rectifier, a HV (high voltage) power switching converter, a second EMI (electromagnetic interference) filter, a DC to AC converter, a main transformer, a rectifier circuit, a feed back circuit, a PWM (pulse width modulation) control, and a ripple and RFI (radio frequency interference) filter;

an AC plug mounted in said housing and moved between a first position where said AC plug is extended out of said housing for connection to a city power supply outlet to obtain AC power supply from it, and a second position where said AC plug is received inside said housing;

a DC plug mounted in said housing and moved between a first position where said DC plug is extended out of said housing for connection to a socket for cigarette lighter of a car to obtain DC power supply from it, and a second position where said DC plug is received inside said housing; and

a DC output connector connected to said main transformer by a cable;

wherein input AC power supply obtained from said AC plug is processed through said first EMI filter, said HV rectifier and said HV power switching converter and then transmitted to said main transformer for converting into the desired DC power supply;

input DC power supply obtained from said DC plug is processed through said second EMI filter and said DC to AC converter and then transmitted to said main transformer for converting into the desired DC power supply;

said main transformer drops the voltage of input AC/DC power supply, then sends it to said DC output connector through said cable via said rectifier circuit and said RFI filter;

said feed back circuit sends a feed back signal to said PWM control and said DC to AC converter when said main transformer sends processed power supply to said DC output connector, causing said HV power switching converter/said DC to AC converter to stabilize the voltage, and wherein

said housing comprises a first transverse sliding slot, two first recessed holes inside said top cover shell at two opposite ends of said first transverse sliding slot, a second transverse sliding slot, and two second recessed holes inside said top cover shell at two opposite ends of said second transverse sliding slot;

said AC plug comprises an open chamber, a block mounted in the open chamber on said AC plug, a T-shaped slide coupled to the block of said AC plug and moved along said first transverse sliding slot between said two first recessed holes, and a compression spring mounted in the open chamber on said AC plug and imparting an upward pressure to the block of said AC plug, the block of said AC plug being forced into engagement with one first recessed hole to hold said AC plug in position when said AC plug is moved to the first or second position;

said DC plug comprises an open chamber, a block mounted in the open chamber on said DC plug, a T-shaped slide coupled to the block of said DC plug and moved along said second transverse sliding slot between said two second recessed holes, and a compression spring mounted in the open chamber on said DC plug and imparting an upward pressure to the block of said DC plug, the block of said DC plug being forced by the corresponding compression spring into engagement with one second recessed hole to hold said DC plug in position when said DC plug is moved to the first or second position.

2. The DC power supply device of claim 1, wherein said housing comprises a wire groove around the periphery adapted to receive said cable of said DC output connector.

3. The DC power supply device of claim 1, wherein said housing comprises a connector chamber adapted to receive said DC output connector.