CN115509292A - Power regulating circuit - Google Patents

Power regulating circuit Download PDF

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Publication number
CN115509292A
CN115509292A CN202110783152.3A CN202110783152A CN115509292A CN 115509292 A CN115509292 A CN 115509292A CN 202110783152 A CN202110783152 A CN 202110783152A CN 115509292 A CN115509292 A CN 115509292A
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CN
China
Prior art keywords
terminal
coupled
current
transistor
discharge
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Pending
Application number
CN202110783152.3A
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Chinese (zh)
Inventor
锺毓伦
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Weltrend Semiconductor Inc
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Weltrend Semiconductor Inc
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Publication of CN115509292A publication Critical patent/CN115509292A/en
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/66—Regulating electric power

Abstract

The power regulating circuit comprises a detection unit, a control unit and a discharge element. The detection unit comprises a first end coupled to the capacitor to receive the induced current and a second end. The control unit can generate a control current according to the induced current, and comprises a first end coupled to the second end of the detection unit, a second end used for generating the control current, and a third end. The discharge element can generate a discharge current according to the control current, and comprises a first end coupled to the third end of the control unit, and a second end coupled to the capacitor and the first end of the detection unit so as to generate the discharge current. When the measured voltage of the first end of the detection unit rises, the induced current and the control current rise, and the discharge current falls.

Description

Power regulating circuit
Technical Field
The present invention relates to a power conditioning circuit, and more particularly, to a power conditioning circuit capable of reducing a discharge current when a measured voltage rises, thereby stabilizing a discharge power.
Background
In a power supply system, a capacitor is usually required to be discharged to meet the specification, and the discharge power must be adjusted in response to different external factors to achieve sufficient safety.
In order to prevent the discharge power from being too large, a plurality of discharge devices may be used, and a part or all of the discharge devices may be controlled to be enabled to adjust the discharge level. In addition, the duty cycle of the discharge element can be adjusted to adjust the proportion of the discharge time and the non-discharge time of the discharge element, so that the maximum value of the discharge power does not exceed the limit of the safety condition. In the above operation, a constant current discharge element is often used, and when the measured voltage measured at the capacitor rises, the discharge power also rises. Therefore, when the measured voltage rises, the discharge power easily exceeds the maximum allowable value, causing a danger. The constant current discharge device must reserve margin (margin) when the voltage at the discharge position is close to the maximum value, so as to prevent the discharge power from exceeding the maximum allowable value, which also causes the poor discharge efficiency.
Disclosure of Invention
The embodiment provides a power regulating circuit, which comprises a detection unit, a control unit and a discharge element. The detection unit comprises a first end coupled to a capacitor to receive an induced current and a second end. The control unit is used for generating a control current according to the induced current and comprises a first end coupled to the second end of the detection unit, a second end used for generating the control current and a third end. The discharge element is used for generating a discharge current according to the control current and comprises a first end coupled to the third end of the control unit and a second end coupled to the capacitor and the first end of the detection unit so as to generate the discharge current. The capacitor discharges through the discharge current, and when a measured voltage at the first end of the detection unit rises, the induced current and the control current rise, and the discharge current falls.
Drawings
Fig. 1 to 3 are schematic diagrams of power conditioning circuits in different embodiments.
FIG. 4 is a graph of the discharge power versus the measured voltage of FIG. 3.
Detailed Description
Fig. 1 is a schematic diagram of a power conditioning circuit 100 according to an embodiment. The power conditioning circuit 100 may include a detection unit 110, a control unit 120, and a discharge element 130.
The detecting unit 110 includes a first terminal N11 and a second terminal N12, wherein the first terminal N11 is coupled to the capacitor C to receive the sensing current I SEN . The control unit 120 is used for controlling the current I according to the sensed current SEN Generating a control current I CTL . The control unit 120 includes a first terminal N21, a second terminal N22 and a third terminal N23, the first terminal N21 is coupled to the second terminal N12 of the detection unit 110, and the second terminal N22 is used for generating the control current I CTL . The discharge element 130 is used for controlling the current I CTL Generating a discharge current I DISC . The discharge element 130 includes a first terminal N31 and a second terminal N32, the first terminal N31 is coupled to the third terminal N23 of the control unit 120, and the second terminal N32 is coupled to the capacitor C and the first terminal N11 of the detection unit 110 for generating a discharge current I DISC . The capacitor C can pass the discharge current I DISC Discharged, and when the first terminal N11 of the detecting unit 110 (i.e. the discharged node) is tested for the voltage V DISC Rise, induce current I SEN And control current I CTL Can rise and discharge current I DISC May be lowered.
The discharge power (hereinafter denoted by P) due to the capacitor C may be a discharge current I DISC And a measured voltage V DISC That is, P = V DISC ×I DISC ) When the voltage V is measured DISC Increase to discharge current I DISC The discharge power P can be stabilized by decreasing. Therefore, adaptive control (adaptive control) can be achieved, and discharge operation with fixed discharge power is realized, so that the danger caused by overhigh discharge power is avoided, and poor discharge efficiency caused by reserving excessive margin can also be avoided.
Fig. 2 is a schematic diagram of a power conditioning circuit 100 according to another embodiment. As shown in fig. 2, the discharge device 130 may include a transistor T1, and the transistor T1 may include a first terminal, a second terminal, and a control terminal, wherein the first terminal may be coupled to the second terminal N32 of the discharge device 130, the control terminal may be coupled to the first terminal N31 of the discharge device 130, and the second terminal may be coupled to the reference voltage terminal VSS. The reference voltage terminal VSS may be a ground terminal or a low voltage terminal, for example.
As shown in fig. 2, the control unit 120 may include a transistor T2 and a resistor R CTL . The transistor T2 may include a first terminal, a second terminal, and a control terminal, wherein the control terminal may be coupled to the first terminal N21 of the control unit 120, and the second terminal may be coupled to the reference voltage terminal VSS. Resistance R CTL May include a first terminal coupled to the reference voltage terminal VDD and a second terminal coupled to the first terminal of the transistor T2. The reference voltage terminal VDD may be, for example, a power supply voltage terminal or a high voltage terminal.
According to an embodiment, the control unit 120 may include a switch SW1 and a switch SW2. The switch SW1 may be coupled between the first terminal of the transistor T2 and the third terminal N23 of the control unit 120. The switch SW2 may be coupled between the third terminal N23 of the control unit 120 and the reference voltage terminal VSS. When one of the switches SW1 and SW2 is turned on, the other of the switches SW1 and SW2 is turned off. When the switch SW1 is turned on and the switch SW2 is turned off, the operation of the embodiment may be performed to regulate and stabilize the discharge power of the capacitor C. When the switch SW1 is turned off and the switch SW2 is turned on, the capacitor C may not be discharged. The switches SW1 and SW2 can be selectively set according to requirements.
As shown in FIG. 2, the detecting unit 110 may include a resistor R SEN And a transistor T3. Resistance R SEN Includes a first terminal and a second terminal, wherein the first terminal can be coupled to the first terminal N11 of the detecting unit 110. The transistor T3 may include a first terminal, a control terminal and a second terminal, wherein the first terminal may be coupled to the resistor R SEN A control terminal may be coupled to the first terminal of the transistor T3 and the second terminal N12 of the detection unit 110, and the second terminal may be coupled to the reference voltage terminal VSS.
In FIG. 2, the measured voltage V DISC And threshold voltage V of transistor T3 TH Is divided by the resistance R SEN The resulting quotient can be the sense current I SEN As follows: i is SEN ＝(V DISC –V TH )/R SEN . In FIG. 2, transistors T3 and T2 form a current mirror, so that the induced current I SEN May be proportional to the control current I CTL Therefore, the above equation can be expressed as I SEN ＝(V DISC –V TH )/R SEN ∝I CTL (ii) a In other words, when the voltage V is induced DISC Rising, induced current I SEN And control current I CTL It can rise along with it. Due to the voltage V at the first terminal of the transistor T2 CTL The voltage value of the reference voltage terminal VDD can be subtracted by the resistor R CTL The cross-pressure at both ends, i.e. as indicated by V CTL ＝VDD–(I CTL ×R CTL ) Therefore when the induced voltage V is DISC Rise and control the current I CTL With the rise, the voltage V CTL May be decreased.
When the switch SW1 is turned on to smoothly discharge power, with respect to the voltage V CTL And discharge current I DISC Can be represented as I DISC ＝1/2×μ 0 ×C ox ×(V CTL –V TH ) 2 In which μ 0 May be the mobility of electrons, C ox Capacitance being the oxide layer of the transistor T1, V TH Is the threshold voltage of the transistor T1. Therefore, when the voltage V is CTL Decrease, then discharge current I DISC And may be lowered accordingly.
According to the above, when the induced voltage V DISC Rise, voltage V CTL Can be reduced and the discharge current I DISC Can be decreased accordingly, so that the discharge power can be adjusted and stabilized, wherein the discharge power is the induced voltage V DISC And discharge current I DISC The product of (a).
In fig. 2, the transistors T1, T2 and T3 can be nmos transistors. The transistor of fig. 2 may also be a bipolar transistor, depending on the embodiment.
Fig. 3 is a schematic diagram of a power conditioning circuit 100 according to another embodiment. In fig. 3, the control unit 120 and the discharge element 130 are similar to those in fig. 2, and therefore are not repeated. As shown in FIG. 3, the detecting unit 110 may include a resistor R SEN A transistor T31 and a transistor T32. Resistance R SEN May include a first terminal and a second terminal, wherein the first terminal may be coupled to the first terminal N11 of the detection unit 110. The transistor T31 may include a first terminal, a control terminal, and a second terminal, wherein the first terminal may be coupled to the resistor R SEN And the control terminal can receive a predetermined voltage V CTH . The transistor T32 may include a first terminal coupled to the second terminal of the transistor T31, a control terminal coupled to the first terminal of the transistor T32 and the second terminal N12 of the detection unit 110, and a second terminal coupled to the reference voltage terminal VSS.
In FIG. 3, the measured voltage V DISC Minus a predetermined voltage V CTH Then subtracting the threshold voltage V of the transistor T32 TH The resulting difference, divided by the resistance R SEN The resulting quotient can be the sense current I SEN It can be expressed as: i is SEN ＝[V DISC –(V CTH +V TH )]/R SEN ∝I CTL . Similar to FIG. 2, when the voltage V is measured DISC Rising, induced current I SEN And control current I CTL Can be increased along with the voltage V CTL Decrease, resulting in discharge current I DISC Thereby smoothing the discharge power of the capacitor C.
In FIG. 3, a predetermined voltage V CTH May be a threshold voltage that enables adaptive control. When the measured voltage V is DISC Less than a predetermined voltage V CTH And a threshold voltage V TH Sum (that is, when V DISC <V CTH +V TH ) While inducing a current I SEN Can approach zero to control current I CTL Also close to zero, in this case due to the resistance R CTL Almost no voltage drop across, so voltage V CTL The voltage of the control terminal of the transistor T1 is approximately equal to the voltage of the reference voltage terminal VDD. In this case, the discharge performed by the discharge device 130 is a conventional constant current discharge operation, so the discharge power will follow the measured voltage V DISC Is raised, the discharge operation of constant power cannot be performed. When measured voltage V DISC Greater than or equal to a predetermined voltage V CTH And a threshold voltage V TH Sum (i.e., when V is DISC ≥V CTH +V TH ) In this case, the power conditioning circuit 100 may perform a constant power discharge operation.
In fig. 3, the transistors T1, T2 and T32 can be nmos transistors, and the transistor T31 can be a pmos transistor. The transistor of fig. 3 may also be a bipolar transistor, depending on the embodiment.
FIG. 4 shows the discharge power and measured voltage V of FIG. 3 DISC A graph of the relationship (c). In FIG. 4, the horizontal axis may be the measured voltage V DISC The vertical axis may be discharge power, line a may correspond to a constant current discharge operation without using the power regulating circuit 100, and line B may correspond to a constant power discharge operation using the power regulating circuit 100. As shown by line A, according to the constant current discharge operation, the discharge power will follow the measured voltage V DISC And thus may cause a risk of excessive power. Such asLine B shows at the measured voltage V DISC After a predetermined value (e.g., 15 volts), the discharge power can be approximately constant, so that constant-power discharge operation can be realized. The values of the voltage and the power shown in fig. 4 are only examples, and the embodiment is not limited thereto. Discharge power and voltage V under test for the circuit of FIG. 2 DISC The relationship diagram is similar to that in FIG. 4, and thus is not repeated.
In summary, the power conditioning circuit 100 provided in the embodiment can be used to implement a constant-power discharging operation, so that adaptive control can be achieved, thereby avoiding a risk caused by an excessively high discharging power, and also avoiding a deficiency of poor discharging efficiency due to an excessively reserved margin, which is helpful for handling long-term problems in the field.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in the claims of the present invention should be covered by the present invention.
[ description of symbols ]
100. Power regulating circuit
110. Detection unit
120. Control unit
130. Discharge element
First end of N11, N21, N31
Second end of N12, N22, N32
N23 third terminal
VDD, VSS reference voltage terminal
C capacitor
I SEN Induced current
V DISC Measured voltage
I DISC Discharge current
I CTL Controlling current
R SEN ,R CTL Resistance (RC)
SW1, SW2 switch
T1, T2, T3, T31, T32 transistor
V CTL Voltage of
V CTH Predetermined voltage
A, B line

Claims (9)

1. A power regulating circuit, comprising:
a detection unit, including a first end coupled to a capacitor for receiving an induced current, and a second end;
the control unit is used for generating a control current according to the induction current and comprises a first end coupled to the second end of the detection unit, a second end used for generating the control current and a third end; and
a discharge element for generating a discharge current according to the control current, including a first end coupled to the third end of the control unit, and a second end coupled to the capacitor and the first end of the detection unit to generate the discharge current;
the capacitor discharges through the discharge current, and when a measured voltage at the first end of the detection unit rises, the induced current and the control current rise, and the discharge current falls.
2. The power regulating circuit of claim 1, wherein the discharge element further comprises:
a first transistor having a first terminal coupled to the second terminal of the discharge element, a control terminal coupled to the first terminal of the discharge element, and a second terminal coupled to a first reference voltage terminal.
3. The power regulating circuit of claim 2, wherein the control unit further comprises:
a second transistor having a first terminal, a control terminal coupled to the first terminal of the control unit, and a second terminal coupled to the first reference voltage terminal; and
a first resistor having a first terminal coupled to a second reference voltage terminal and a second terminal coupled to the first terminal of the second transistor.
4. The power regulating circuit of claim 3, wherein the control unit further comprises:
a first switch coupled between the first terminal of the second transistor and the third terminal of the control unit; and
a second switch coupled between the third terminal of the control unit and the first reference voltage terminal;
when one of the first switch and the second switch is turned on, the other of the first switch and the second switch is turned off.
5. The power regulating circuit of claim 3, wherein the detecting unit further comprises:
a second resistor having a first end coupled to the first end of the detection unit and a second end; and
a third transistor having a first terminal coupled to the second terminal of the second resistor, a control terminal coupled to the first terminal of the third transistor and the second terminal of the detection unit, and a second terminal coupled to the first reference voltage terminal.
6. The power regulating circuit of claim 5, wherein the quotient of the difference between the measured voltage and a threshold voltage of the third transistor divided by the resistance of the second resistor is the sense current.
7. The power regulating circuit of claim 3, wherein the detection unit further comprises:
a second resistor having a first end coupled to the first end of the detection unit and a second end;
a third transistor having a first terminal coupled to the second terminal of the second resistor, a control terminal for receiving a predetermined voltage, and a second terminal; and
a fourth transistor having a first terminal coupled to the second terminal of the third transistor, a control terminal coupled to the first terminal of the fourth transistor and the second terminal of the detection unit, and a second terminal coupled to the first reference voltage terminal.
8. The power regulating circuit of claim 7, wherein the sensed voltage minus the predetermined voltage minus a threshold voltage of the fourth transistor is divided by a resistance of the second resistor to obtain a quotient of the sensed current.
9. The power regulating circuit of claim 1, wherein the induced current is proportional to the control current.
CN202110783152.3A 2021-06-22 2021-07-12 Power regulating circuit Pending CN115509292A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TW110122685 2021-06-22
TW110122685A TWI785657B (en) 2021-06-22 2021-06-22 Power regulation circuit

Publications (1)

Publication Number Publication Date
CN115509292A true CN115509292A (en) 2022-12-23

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Application Number Title Priority Date Filing Date
CN202110783152.3A Pending CN115509292A (en) 2021-06-22 2021-07-12 Power regulating circuit

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TW (1) TWI785657B (en)

Family Cites Families (13)

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WO2002078159A2 (en) * 2001-03-22 2002-10-03 Primarion, Inc. Power regulation system, apparatus, and method for providing regulated power to a microelectronic device
US6977492B2 (en) * 2002-07-10 2005-12-20 Marvell World Trade Ltd. Output regulator
US8405367B2 (en) * 2006-01-13 2013-03-26 Enecsys Limited Power conditioning units
EP2218162A1 (en) * 2007-11-26 2010-08-18 Koninklijke Philips Electronics N.V. Power factor control circuit and mains power supply
US8612782B2 (en) * 2011-03-31 2013-12-17 Intel Corporation System and method for determining multiple power levels of the sub-systems based on a detected available power and prestored power setting information of a plurality of different combinations of the sub-systems
US8934266B2 (en) * 2011-08-26 2015-01-13 System General Corp. Adaptive slope compensation programmable by input voltage of power converter
US9118239B2 (en) * 2012-03-29 2015-08-25 Texas Instruments Incorporated Power supply control method for constant current constant power control
US9509176B2 (en) * 2012-04-04 2016-11-29 Ihi Inc. Energy storage modeling and control
TW201411989A (en) * 2012-09-06 2014-03-16 Hon Hai Prec Ind Co Ltd Source circuit and control method thereof
TWI446137B (en) * 2012-10-09 2014-07-21 Delta Electronics Inc Power control circuit and power supply system thereof
CN107565813A (en) * 2016-06-30 2018-01-09 中兴通讯股份有限公司 Apparatus for adjusting power supply and method, the chip system and method for running chip system
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TWI785657B (en) 2022-12-01

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