Voltage supply circuit

• US 5,132,893 A
• Filed: 07/25/1991
• Issued: 07/21/1992
• Est. Priority Date: 07/25/1990
• Status: Expired due to Fees

• Current Assignee: Honeywell Regelsysteme GmbH (Honeywell International Inc.)
• Original Assignee: Honeywell Incorporated (Honeywell International Inc.)
• Inventors: Koelbli, Bertram, Klein, Johannes-Artur
• Primary Examiner(s): Stephan, Steven L.
• Assistant Examiner(s): Davidson, Ben
• Application Number:
  US07/735,976
• Time in Patent Office: 362 Days
• Field of Search: 363/49, 363/89, 323/901, 323/266, 323/270, 323/271
• US Class Current: 363/49
• CPC Class Codes: G05F 1/563 including two stages of regulation at least one of which is output level responsive, e.g. coarse and fine regulation
• CPC Class Codes: H02M 3/1563 without using an external clock H02M3/158 takes precedence
• CPC Class Codes: Y10S 323/901 Starting circuits

Abstract

In order to provide a voltage supply circuit with high efficiency, high control quality and with optimum utilization of the present energy the circuit comprises in combination a switching controller and a longitudinal voltage controller and a static starter circuit is provided, which supplies via a transistor the electronic components of the circuit with energy until a predetermined voltage is attained.

Claims

1. A voltage supply circuit, comprising:

first storage capacitor chargeable by a high frequency AC voltage;

control circuit connected to said first storage capacitor, said control circuit comprising switching controller means (42, 44, 40, 50,

     62) for transforming the voltage of said first storage capacitor (14) into a voltage on a second storage capacitor (40) by switching said switching controller means, a linear voltage regulator (100, 112,

     106) connected to said second storage capacitor (40) for providing an output voltage at an output terminal (102), and static starter circuit means (82, 84, 30, 22, 86, 20, 26, 64, 90,

     80) for inhibiting said switching of said switching controller means until a predetermined voltage has built up on said first and second storage capacitors (14,

     40).

2. The voltage supply circuit according to claim 1, further comprising:

a series connection of a third transistor'"'"'s (42) emitter-collector path and an inductive coil (44), connected between said first storage capacitor (14) and said second storage capacitor (40),

a parallel combination of a second and a fourth transistor connected to the base of said third transistor (42), (30,

     54) and whereby said second transistor (30) serves to enable said third transistor (42) and said fourth transistor (54) serves to inhibit said third transistor (42).

3. The voltage supply circuit according to claim 2, wherein said second transistor (30) is inhibited by means of a voltage divider (84, 82, 80, 86, 22, 26, 28) and said fourth transistor (54) is inhibited by the output signal of a comparator (62) which compares the voltage over said second storage capacitor (40) to a reference voltage.

4. The voltage supply circuit of claim 1 further comprising:

a control transistor (100) having its emitter-collector path connected between said second storage capacitor (40) and the output (102) of the voltage supply circuit;

an amplifier means (112) having its output connected to the base of said control transistor, for comparing the output voltage (102) to a predetermined reference voltage.

5. The voltage supply circuit according to claim 4, further comprising a series connection of a capacitor (130) and a resistor (132) connected between the output of said amplifier means (112) and the inverting input(116) of said amplifier means (112).

6. The voltage supply circuit according to claim 1, further comprising:

the series combination of a first transistor (22) and a first resistive means (20) connected in parallel with said first storage capacitor (14)

the series combination of a second transistor (30) and a second resistive means (56,

     58) connected in parallel with said first storage means;

a first voltage divider comprising said first resistive means (20) and a third resistive means (26,

     28), said third resistive (26,

     28) means connected in parallel with said first transistor (22);

a second voltage divider (24, 86, 80, 82,

     84) connected in parallel with said first storage capacitor (14)

whereby a portion of said first voltage divider is shorted to ground by said first transistor (22) when voltage across said second storage capacitor reaches a predetermined value.

7. A voltage supply circuit comprising:

a first storage capacitor (14) being charged by a high frequency AC voltage;

a switching regulator (42, 44, 40, 50,

     62) for transforming the voltage of said first storage capacitor (14) into a voltage on a second storage capacitor (40) connected in parallel to said switching regulator, wherein said switching regulator comprises the series connection of the emitter/collector path of a third transistor (42) and of an inductive coil (44) between said first storage capacitor (14) and said second storage capacitor (40), and said transformation of voltage on said first storage capacitor to a voltage on said second capacitor is achieved by switching said third transistor;

a linear voltage regulator (100, 112,

     106) connected to said second storage capacitor (40) for providing an output voltage at an output (102), wherein said linear voltage regulator comprised the emitter/collector path of a control transistor (100) between said second storage capacitor (40) and said output (102) with the base of said control transistor being controlled by an amplifier (112) which compares the output voltage to a predetermined reference voltage; and

a static starter circuit (82, 84, 30, 22, 86, 20, 26, 64, 90,

     80) for inhibiting the switching of said switching regulator by steering said third transistor (42) in its conducting state until a predetermined voltage has built up on said storage capacitors (14,

     40).

8. The voltage supply circuit according to claim 7, wherein said starter circuit comprises:

a first initially inhibited transistor (22) and a second initially conducting transistor (30), both transistors (30,

     22) being connected with their collector/emitter-paths in parallel to said first storage capacitor (14), a first voltage divider (20, 26,

     28) and a second voltage divider (14, 86, 80, 82, 84,

     22) whereat a portion of said first voltage divider (R5, R6, R7) is short-circuited to ground by said second storage capacitor when the voltage over said second storage capacitor (40) reaches a predetermined value thereby inhibiting said second transistor 30.

9. The voltage supply circuit according to claim 8, wherein the base of said third transistor (42) is controlled by collector/emitter-path of said second initially conducting transistor (30) and by the collector/emitter-path of a fourth transistor (54) arranged in parallel to said second transistor (30) and wherein said second transistor (30) serves to enable said third transistor (42) and said fourth transistor serves to inhibit said third transistor (42).

10. The voltage supply circuit according to claim 9, wherein said second transistor (30) is inhibited by means of a voltage divider (84, 82, 80, 86, 22, 26, 28) and said fourth transistor (54) is inhibited by the output signal of a comparator (62) which compares the voltage over said second storage capacitor (40) to a reference voltage.

11. The voltage supply circuit according to claim 10, wherein the series connection of a capacitor (130) and a resistor (132) is connected between the output and the inverting input of an amplifier (112).

12. A voltage supply circuit, comprising:

first storage capacitor (14) chargeable by a high frequency AC voltage;

switching regulator means (42, 44, 40, 50,

     62) connected to said first storage capacitor (14), having a third transistor (42) connected between said first storage capacitor (14) and a switching regulator means output (99), said switching regulator means for transforming a voltage on said first storage capacitor (14) to a voltage at said output (99) of said switching regulator means by switching said third transistor (42) in a predetermined manner;

linear voltage regulator means (100, 112,

     106) connected to said output (99) of said switching regulator means for providing an output voltage at an output (102) of said linear voltage regulator means, said output voltage achieved by smoothing the voltage at said switching means output; and

static starter means (82, 84, 30, 22, 86, 20, 26, 64, 90,

     80) connected to said switching regulator means for inhibiting the switching of said third transistor (42) by holding said third transistor (42) in its conducting state until a predetermined voltage has built up on said first storage capacitor (14) and at said switching regulator means output (99).

13. The voltage supply circuit of claim 12 wherein said switching regulator means has a second storage capacitor (40) in parallel with said output (99).

14. The voltage supply circuit according to claim 12, wherein said starter circuit comprises:

a first initially inhibited transistor (22) and a second initially conducting transistor (30), both transistors (30,

     22) being connected with their collector/emitter-paths in parallel to said first storage capacitor (14), a first voltage divider (20, 26,

     28) and a second voltage divider (24, 86, 80, 82, 84,

     22) whereat a portion of said first voltage divider (R5, R6, R7) is short-circuited to ground by said second storage capacitor when the voltage over said second storage capacitor (40) reaches a predetermined value thereby inhibiting said second transistor 30.

15. The voltage supply circuit according to claim 14, wherein the base of said third transistor (42) is controlled by collector/emitter-path of said second initally conducting transistor (30) and by the collector/emitter-path of a fourth transistor (54) arranged in parallel to said second transistor (30) and wherein said second transistor (30) serves to enable said third transistor (42) and said fourth transistor serves to inhibit said third transistor (42).

16. The voltage supply circuit according to claim 15, wherein said second transistor (30) is inhibited by means of a voltage divider (84, 82, 80, 86, 22, 26, 28) and said fourth transistor (54) is inhibited by the output signal of a comparator (62) which compares the voltage over said second storage capacitor (40) to a reference voltage.

17. The voltage supply circuit according to claim 16, wherein the series connection of a capacitor (130) and a resistor (132) is connected between the output and the inverting input of an amplifier (112).